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Journal articles on the topic 'MOSIX systms'

Author: Grafiati
Published: 4 June 2021
Last updated: 12 February 2022

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1

Maloy, Stuart A. "A Tem Study of Slip Systems in MoSi2/WSi2 Alloys." Proceedings, annual meeting, Electron Microscopy Society of America 49 (August 1991): 942–43. http://dx.doi.org/10.1017/s0424820100089020.

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MoSi2 has recently been investigated as a potential material for high temperature structural applications. It has excellent oxidation resistance up to 1700°C, a high melting temperature, 2030°C, and a brittle-to-ductile transition temperature at 900-1000°C. WSi2 is isomorphous with MoSi2 and has a body-centered tetragonal unit cell of the space group 14/mmm. The lattice parameters are a=3.20 Å and c=7.84 Å for MoSi2 and a=3.21 Å and c=7.88 Å for WSi2. Therefore, WSi2 was added to MoSi2 to improve its strength via solid solution hardening. The purpose of this study was to investigate the slip systems in polycrystalline MoSi2/WSi2 alloys.
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2

Srinivasan, S. R., and R. B. Schwarz. "Elastic moduli of MoSi2-based materials." Journal of Materials Research 7, no. 7 (July 1992): 1610–13. http://dx.doi.org/10.1557/jmr.1992.1610.

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We prepared MoSi2, two-phase MoSi2/Mo5Si3, and (Mo, W)Si2 solid-solution alloy powders by mechanically alloying mixtures of elemental molybdenum, silicon, and tungsten. These powders were consolidated by hot-pressing them at 1500 °C in graphite dies. We measured the elastic moduli of these alloys by a recently developed technique for non-contact ultrasonic spectroscopy. Second-phase Mo5Si3 additions to MoSi2 result in decreased values for G and E, whereas alloying MoSi2 with WSi2 results in increased values for G and E. An analysis of these Young's moduli and of data from the literature for various intermetallic alloys suggests that for any given alloy system, the Young's moduli for its various intermetallics as a function of density fall on a straight line. Further, the lines for the different alloy systems are approximately parallel.
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3

Jain, Manoj Kumar, J. Subrahmanyam, and Subrata Ray. "Development of Mo and Ta Foil Reinforced (MoSi2 + 20 Vol% SiCp) Matrix Laminated Composites." Advanced Materials Research 585 (November 2012): 306–10. http://dx.doi.org/10.4028/www.scientific.net/amr.585.306.

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MoSi2 based composites have been recognized as a potential candidate materials for high temperature structural applications. Although, MoSi2 has been reinforced by a variety of ceramic particles, ductile phase toughening of MoSi2 has received only limited attention. In the present investigation, ductile refractory metal (Mo and Ta) foils were used as reinforcements in MoSi2 matrix to prepare the laminated composites. 20 vol% SiC particles (SiCp) were also added in MoSi2 matrix to reduce the thermal expansion mismatch between MoSi2 and the ductile metal foils. The improved bonding between MoSi2-SiCp matrix layer and Mo / Ta foils due to reduced residual thermal stresses resulted in significant improvement in the room temperature fracture toughness of both the composite systems over the monolithic MoSi2.
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4

Zinovyeva, M. V., V. V. Sanin, Yu S. Pogozhev, Ye A. Levashov, and A. N. Astapov. "Melting ranges of heterophase systems Zr – Si – ZrB2 – ZrSi2-MoSi2 and Zr – Si – HfB2 – HfSi2 – MoSi2." Perspektivnye Materialy 12 (2020): 5–15. http://dx.doi.org/10.30791/1028-978x-2020-12-5-15.

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The work is devoted to studying the melting ranges of the base Zr – Si eutectic composition depending on the content of the heterophasic powder component in the ZrB2 – ZrSi2 – MoSi2 and HfB2 – HfSi2 – MoSi2 systems in an amount of 30 – 90 % obtained by the method of self-propagating high-temperature synthesis (SHS). The melting range of the mixture Zr – Si was 1420 – 1440 °C, while the addition of SHS-powders ZrB2 – ZrSi2 – MoSi2 led to an increase in the melting onset temperature Тmelt.onset to 1460 – 1560 °С and the complete melting temperature Tmelt.complete to 1480 – 1670 °C. The addition of HfB2 – HfSi2 – MoSi2 powders had a weak effect on the values of Тmelt.onset (1390 – 1430 °С), but led to an increase in the values of Tmelt.complete to 1510 – 1550 °С. X-ray phase analysis showed that the remelted samples contained ZrB2/HfB2, ZrSi2/HfSi2, MoSi2 phases and Si, with the number of phases being directly proportional to the content of SHS powders in the composition of the Zr – Si mixture. The ingots were characterized by a homogeneous structure consisting of a silicon matrix, ZrSi2/HfSi2, MoSi2 disilicide grains, with ZrB2/HfB2 diboride inclusions.
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5

Amar, Lior, Amnon Barak, and Amnon Shiloh. "The MOSIX Direct File System Access Method for Supporting Scalable Cluster File Systems." Cluster Computing 7, no. 2 (April 2004): 141–50. http://dx.doi.org/10.1023/b:clus.0000018563.68085.4b.

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6

Boldt, P. H., G. C. Weatherly, and J. D. Embury. "A Transmission Electron Microscope Study of Hardness Indentations in MoSi2." Journal of Materials Research 15, no. 4 (April 2000): 1025–32. http://dx.doi.org/10.1557/jmr.2000.0146.

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Transmission electron microscopy and electron diffraction were used to study hardness indentations made at room temperature in ⟨001⟩-oriented single crystals of MoSi2. Two families of slip systems, {110}⟨001⟩ and {101}⟨010⟩, were identified. The first system formed ⟨001⟩ dislocation loops by prismatic punching beneath the indenter, while the second system led to large rotations of the crystal lattice beneath the indenter. The lattice rotations were used to estimate the density of dislocations stored in this volume. The results demonstrate that the hardness response of MoSi2 can be explained by the expanding cavity model with most of the plastic accommodation occurring immediately beneath the indenter.
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7

Kung, H., T. R. Jervis, J.-P. Hirvonen, T. E. Mitchell, and M. Nastasi. "The influence of nitrogen on the stability of nanophase molybdenum disilicide." Proceedings, annual meeting, Electron Microscopy Society of America 53 (August 13, 1995): 190–91. http://dx.doi.org/10.1017/s042482010013732x.

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The intermetallic compound, MoSi2, has a combination of interesting properties, ranging from a high melting point to superior high temperature oxidation and corrosion resistance, which makes it a potential candidate for high temperature structural applications. It was shown previously that the addition of nitrogen into MoSi2 forms MoSi2Nx (x:3-4). The new phase has a very high crystallization temperature (> 1000°C) and is thermally compatible with both Mo and MoSi2. As suggested by these results, the introduction of nitrogen into MoSi2 may cause significant changes in its properties, yet the role of nitrogen in influencing the structure and phase stability of MoSi2 is still not known. In this study, we have systematically investigated the evolution of structure in MoSi2 in the presence of different nitrogen contents and annealing conditions.The system investigated is single phase MoSi2Nx. Films were prepared by sputter deposition using a planar magnetron MoSi2 target at a DC power of 100-200 W.
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8

Maloy, S. A., A. H. Heuer, J. J. Lewandowski, and T. E. Mitchell. "On the slip systems in MoSi2." Acta Metallurgica et Materialia 40, no. 11 (November 1992): 3159–65. http://dx.doi.org/10.1016/0956-7151(92)90479-x.

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9

Sinitsyn, D. Yu, V. N. Anikin, S. A. Eremin, V. O. Vanyushin, A. A. Shvetsov, and N. G. Bardin. "Heat-resistant coatings on CCCM for aerospace applications." NOVYE OGNEUPORY (NEW REFRACTORIES), no. 8 (October 23, 2020): 46–52. http://dx.doi.org/10.17073/1683-4518-2020-8-46-52.

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Slip coatings of ZrB2‒MoSi2‒SiC system on CCCM of the next compostions, wt. %: 55 ZrB2 + 25 MoSi2 + 20 SiC (ZSM25), 50 ZrB2 + 30 MoSi2 + 20 SiC (ZSM30) and 45 ZrB2 + 35 MoSi2 + 20 SiC (ZSM35) are discussed in the article. The modes of the coatings’ heat treatment were worked out and the optimal method for producing heat-resistant coatings was selected. It was found that the coating of composition 1 satisfies the heat resistance assessment tests conditions on the Multiplas 2500-m plasmatron, presumably working due to the formation of a highly viscous ZrSiO4 film.
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10

Lee, Sang Ll, J. O. Jin, J. S. Park, Jong K. Lee, Byeong Hyeon Min, Han Ki Yoon, and J. Y. Park. "Fracture Characterization of MoSi2 Based Composites." Key Engineering Materials 261-263 (April 2004): 1481–86. http://dx.doi.org/10.4028/www.scientific.net/kem.261-263.1481.

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This study dealt with the characterization of MoSi2 based composites containing three types of additive materials such as SiC, NbSi2 and ZrO2 particles have been investigated, based on the detailed examination of their microstructures and fracture surfaces. The effects of reinforcing materials on the high temperature strength of MoSi2 based composites have been also examined. MoSi2 based composites were fabricated by the hot press process under the vacuum atmosphere. The volume fraction of reinforcing materials in the composite system was fixed as 20 %. The microstructures and the mechanical properties of MoSi2 based composites were investigated by means of SEM, EDS, XRD and three point bending test.
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11

Kulenko, E. N., and B. I. Polyak. "Sintering of the ceramics belonging to the MoSi2-Y2O3 and MoSi2-SiC systems." Refractories 30, no. 7-8 (July 1989): 418–25. http://dx.doi.org/10.1007/bf01280669.

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12

Barak, Amnon, and Oren La'adan. "The MOSIX multicomputer operating system for high performance cluster computing." Future Generation Computer Systems 13, no. 4-5 (March 1998): 361–72. http://dx.doi.org/10.1016/s0167-739x(97)00037-x.

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13

Chou, T. C., T. G. Nieh, T. Y. Tsui, G. M. Pharr, and W. C. Oliver. "Mechanical properties and microstructures of metal/ceramic microlaminates: Part I. Nb/MoSi2 systems." Journal of Materials Research 7, no. 10 (October 1992): 2765–73. http://dx.doi.org/10.1557/jmr.1992.2765.

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Artificial multilayers, or microlaminates, composed of alternating layers of Nb and MoSi2 of equal thickness were synthesized by d.c., magnetron sputtering. Four different modulation wavelengths, λ, were studied: 7, 11, 20, and 100 nm. The compositions, periodicities, and microstructures of the microlaminates were characterized by Auger electron spectroscopy and transmission electron microscopy. Structural characterization revealed that the as-deposited Nb layers are polycrystalline, while the MoSi2 layers are amorphous. The hardnesses and elastic moduli of the films were measured using nanoindentation techniques. Neither a supermodulus nor a superhardness effect could be identified in the range of wavelengths investigated; for each of the microlaminates, both the hardness and modulus were found to fall between the bounds set by the properties of the monolithic Nb and MoSi2 films. Nevertheless, a modest but a measurable increase in both hardness and modulus with decreasing wavelength was observed, thus indicating that behavior cannot be entirely described by a simple rule-of-mixtures. The hardness was found to vary linearly with Δ−1/2 in a manner similar to the Hall–Petch relationship. Annealing the microlaminates at 800 °C for 90 min produces significant increases in hardness and modulus due to chemical interaction of the layers.
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14

Watanabe, Tadahiko, Guo-Jun Zhang, Xue-Mei Yue, Yu-ping Zeng, Kazuhisa Shobu, and Naoufal Bahlawane. "Multilayer composites in Al2O3/MoSi2 system." Materials Chemistry and Physics 67, no. 1-3 (January 2001): 256–62. http://dx.doi.org/10.1016/s0254-0584(00)00448-x.

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15

Subrahmanyam, J., R. Mohan Rao, and G. Sundarasarma. "Combustion synthesis of MoSi2−TiC composites." Journal of Materials Research 10, no. 5 (May 1995): 1226–34. http://dx.doi.org/10.1557/jmr.1995.1226.

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Stability of the binary phases in the quaternary system Mo–Ti–Si–C was examined for the combustion synthesis or Self-propagating High-temperature Synthesis (SHS) of MoSi2−TiC composites. Thermochemical calculations were carried out to obtain the adiabatic temperatures and the amounts of molten phases at the adiabatic temperature for the SHS of these composites. MoSi2−20 wt. % TiC and MoSi2−40 wt. % TiC composites were prepared by thermal explosion and SHS modes of combustion from elemental powders. The phase formation was confirmed by x-ray diffraction, and the morphologies were observed under SEM. No general correlation was obtained between the phase formation or product morphology on the one hand, and the adiabatic temperature or the amount of molten phase formed at the adiabatic temperature, on the other. MoSi2−40 wt. % TiC composites obtained by SHS mode of combustion show a highly homogeneous distribution of the two phases with negligible amounts of ternary phases.
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16

Pogozhev, Yu S., M. V. Lemesheva, A. Yu Potanin, S. I. Rupasov, V. I. Vershinnikov, and E. A. Levashov. "Heterophase ceramics in the Hf–Si–Mo–B system obtained by a combination of SHS and hot pressing methods." Izvestiya Vuzov Tsvetnaya Metallurgiya (Proceedings of Higher Schools Nonferrous Metallurgy, no. 3 (June 19, 2019): 36–46. http://dx.doi.org/10.17073/0021-3438-2019-3-36-46.

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The paper focuses on obtaining heterophase powder ceramics and consolidated ceramics based on borides and silicides of hafnium and molybdenum by combining the methods of self-propagating high-temperature synthesis (SHS) and hot pressing (HP). Composite ceramic SHS powders HfB2–HfSi2–MoSi2 were obtained according to the scheme of magnesium-thermal reduction from oxide raw materials where the combustion wave is characterized by temperatures of 1750–2119 K and high mass combustion rates of 8,4– 9,3 g/s. The structure of synthesized SHS powders consists of relatively large MoSi2 grains up to 10 μm in size and submicron elongated HfB2 grains located mainly inside the MoSi2 grains and rounded Si precipitates. The composition with a lower concentration of boron contains a large number of polyhedral HfSi2 grains with a size of less than 10 μm. The resulting powders are characterized by an average particle size of ~6 μm with a maximum size up to 26 μm. Phase compositions of ceramics consolidated by the HP method and SHS synthesized powders are identical. The microstructure of compact samples consists of faceted HfB2 elongated grains 0,5– 10,0 μm in size, polyhedral HfSi2 and MoSi2 grains up to 8–10 μm in size and silicon interlayers. Consolidated ceramics has a high structural and chemical homogeneity, low residual porosity of 1,1–1,7 %, high hardness of 11,7–12,6 GPa and thermal conductivity of 62–87 W/(m·K).
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17

Umakoshi, Y., T. Hirano, T. Sakagami, and T. Yamane. "Slip systems and hardness in MoSi2 single crystals." Scripta Metallurgica 23, no. 1 (January 1989): 87–90. http://dx.doi.org/10.1016/0036-9748(89)90098-7.

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18

Zinovyeva, M. V., V. V. Sanin, Yu S. Pogozhev, A. N. Astapov, and Ye A. Levashov. "Melting Ranges of Zr–Si–ZrB2–ZrSi2–MoSi2 and Zr–Si–HfB2–HfSi2–MoSi2 Heterophase Systems." Inorganic Materials: Applied Research 12, no. 2 (March 2021): 271–79. http://dx.doi.org/10.1134/s2075113321020465.

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19

Astapov, A. N., Yu S. Pogozhev, M. V. Lemescheva, S. I. Rupasov, V. I. Vershinnikov, I. P. Lifanov, and L. N. Rabinskiy. "Magnesiothermal synthesis and consolidation of multicomponent powder ceramics in the Zr–Si–Mo–B system." Izvestiya Vuzov. Poroshkovaya Metallurgiya i Funktsional’nye Pokrytiya (Universitiesʹ Proceedings. Powder Metallurgy аnd Functional Coatings), no. 1 (March 21, 2019): 30–41. http://dx.doi.org/10.17073/1997-308x-2019-1-30-41.

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The work aims to obtain composite powder ceramics based on ZrB2–ZrSi2–MoSi2 by the self-propagating high-temperature synthesis (SHS) according to the scheme of magnesium thermal reduction from oxide raw materials, as well as its subsequent consolidation by hot pressing (HP). The combustion of the reaction mixtures is characterized by rather high adiabatic temperatures in the range of 2060 to 2120 K and burning rates in the range of 8,3 to 9,4 g/s. The yield of the end product with magnesiothermal reduction is 34–38 %. The resulting powder contains 13–47 % ZrB2, 21–70 % ZrSi2, 2–32 % ZrSi, and 10–18 % MoSi2 depending on the composition of the initial reaction mixture. It is characterized by high structural homogeneity and consists of composite particles of polyhedral shape with an average about 8 microns in size. The structure of ceramics consolidated by the HP method from SHS powder is homogeneous and includes ZrB2 needle grains distributed in a ZrSi2 matrix, MoSi2 inclusions of various morphology and ZrSiO4 silicate, distributed along the grain boundaries of ZrSi2. The samples obtained by HP are characterized by a high degree of homogeneity of the chemical composition and a residual porosity of 2,5–7,4 %.
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20

Kang, Peng Chao, Gao Hui Wu, and Zhong Da Yin. "Influence of Nowonty Phase on the Fracture Toughness of SiC/MoSi2 Composites." Key Engineering Materials 353-358 (September 2007): 1326–29. http://dx.doi.org/10.4028/www.scientific.net/kem.353-358.1326.

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MoSi2-SiC precursor powder has been synthesized via the mechanical alloy method with the elements Mo, Si and C powder. The SiC/MoSi2 composites with different SiC volume fraction have been prepared by reactive hot-pressing the precursor powder at 1350 °C. There is a significant increase in the fracture toughness due to addition of SiC reinforcement. However, the intermediary ternary phase exists in this system—namely, Mo5Si3C, Nowotny phase, which has negative effect on the fracture toughness, and can be eliminated through high temperature treatment at 1600 °C for 2 hrs.
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21

Habchi, Georges. "Modelling and simulation of complex production systems [MOSIM'99]." Simulation Practice and Theory 8, no. 5 (December 2000): 281–82. http://dx.doi.org/10.1016/s0928-4869(00)00027-6.

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22

Yamazaki, Toshihiro, Yuichiro Koizumi, Akihiko Chiba, Koji Hagihara, Takayoshi Nakano, Koretaka Yuge, Kyosuke Kishida, and Haruyuki Inui. "Interface Migration with Segregation in MoSi2-Based Lamellar Alloy Simulated by Phase-Field Method." Advanced Materials Research 922 (May 2014): 832–37. http://dx.doi.org/10.4028/www.scientific.net/amr.922.832.

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MoSi2–based alloys are attracting attention as ultra-high temperature structural material for super-high efficiency gas turbine power generation systems. In this study, the effects of Cr-and Zr-addition on interface migration in MoSi2/NbSi2 lamellar silicide were examined by phase field simulations employing the segregation energies evaluated by the first principles calculation in addition to thermodynamic free energy in order to take into account the chemically-driven interfacial segregation. The simulation results indicate that both Cr and Zr can segregate at the lamellar interface to suppress its migration, and the Zr-addition is more effective to lower the interface migration rate than the Cr-addition owing to its higher segregation energy.
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23

Nagano, Satoshi, Masahiro Yokouchi, Takao Setoguchi, Hiromi Sasaki, Hirofumi Shimada, Ichiro Kawamura, Yasuhiro Ishidou, et al. "Analysis of Surgical Site Infection after Musculoskeletal Tumor Surgery: Risk Assessment Using a New Scoring System." Sarcoma 2014 (2014): 1–9. http://dx.doi.org/10.1155/2014/645496.

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Surgical site infection (SSI) has not been extensively studied in musculoskeletal tumors (MST) owing to the rarity of the disease. We analyzed incidence and risk factors of SSI in MST. SSI incidence was evaluated in consecutive 457 MST cases (benign, 310 cases and malignant, 147 cases) treated at our institution. A detailed analysis of the clinical background of the patients, pre- and postoperative hematological data, and other factors that might be associated with SSI incidence was performed for malignant MST cases. SSI occurred in 0.32% and 12.2% of benign and malignant MST cases, respectively. The duration of the surgery (P=0.0002) and intraoperative blood loss (P=0.0005) was significantly more in the SSI group than in the non-SSI group. We established the musculoskeletal oncological surgery invasiveness (MOSI) index by combining 4 risk factors (blood loss, operation duration, preoperative chemotherapy, and the use of artificial materials). The MOSI index (0–4 points) score significantly correlated with the risk of SSI, as demonstrated by an SSI incidence of 38.5% in the group with a high score (3-4 points). The MOSI index score and laboratory data at 1 week after surgery could facilitate risk evaluation and prompt diagnosis of SSI.
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24

Fu, Ming. "A study of micropyretic reactions in the Mo–Si–Al ternary system." Journal of Materials Research 12, no. 6 (June 1997): 1481–91. http://dx.doi.org/10.1557/jmr.1997.0204.

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Micropyretic synthesis technique employs self-sustaining exothermic (combustion) reactions for the preparation of various ceramic, intermetallic, and composite materials. In the present work, the combustion reactions of Mo and Si with Al additions have been systematically studied. The atomic mixtures of the reactant powders are chosen to be Mo + (2 − x)Si + xAl with x = 0−0.4. In comparison with the Mo + 2Si reaction which leads to the formation of MoSi2, the substitution of Al for Si decreases the sample ignition temperature, but increases the intensity of the combustion reactions. In addition, the substitution of Al for Si results in the formation of a ternary intermetallic phase, called molybdenum alumino-silicide Mo(Si, Al)2, in the synthesized product. When the content of Al in the reactant mixtures reaches 0.4, nearly single phase Mo(Si, Al)2 is obtained and no MoSi2 is detected in the reaction product. These influences are analyzed by using x-ray diffraction (XRD), scanning electron microscopy (SEM), and differential thermal analysis (DTA). The effect of Al additions on the reaction mechanism is also discussed.
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25

Markov, M. A., S. S. Ordanyan, S. V. Vikhman, S. N. Perevislov, A. V. Krasikov, А. D. Bykova, and M. V. Staritsyn. "Preparation of structural ceramics in the MoSi2-SiC-ZrB2 system by free sintering." NOVYE OGNEUPORY (NEW REFRACTORIES), no. 8 (October 27, 2019): 34–37. http://dx.doi.org/10.17073/1683-4518-2019-8-34-37.

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The technological modes of obtaining ceramics based on MoSi2, hardened by SiC and ZrB2, which have enhanced physicomechanical properties (relative density ≥ 99,1 %, bending strength 480 MPa), were investigated and experimentally substantiated. The developed composite materials can be recommended for the creation on their basis of functional structural ceramics working at elevated temperatures in an oxidizing environment. Ill. 3. Ref. 11. Tab. 3.
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26

Zhang, Jin Yong, Zheng Yi Fu, and Wei Min Wang. "An Investigation of the Reaction Hot-Pressing Synthesis of MoSi2/Ti3SiC2/Al Composites." Key Engineering Materials 336-338 (April 2007): 1364–67. http://dx.doi.org/10.4028/www.scientific.net/kem.336-338.1364.

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MoSi2 is one of the few intermetallics to have potential for further systems. However, the use of MoSi2 has been hindered due to the brittle nature of the material at low temperatures, inadequate creep resistance at high temperatures, accelerated (pest) oxidation at temperatures between 450~ 550°C. In this investigation Mo(Al,Si2)/Ti3SiC2 composites has been prepared by reaction hot-pressing from Mo, Si, SiC, Ti, Al powder mixture under different temperatures. XRD results show that the main products are Mo(Si,Al)2 and Ti3SiC2. Part of TiC and SiC also appeared at low treating temperature. With the treating temperature increasing SiC disappeared. No evidence show lattice change of Mo(Si,Al)2. It must be the results of sufficient Al added. The electrical conductivity properties were also investigated. Samples treating under different temperatures showed different changes. Samples under high treating temperature showed a near linear change ranging from 27~800°C and Samples under low treating temperature showed a nonlinear change.
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27

Maloy, S. A., J. J. Petrovic, and T. E. Mitchell. "Dislocation decomposition and dissociation in molybdenum disilicide." Proceedings, annual meeting, Electron Microscopy Society of America 51 (August 1, 1993): 912–13. http://dx.doi.org/10.1017/s0424820100150393.

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Molybdenum disilicide(MoSi2) is being investigated as a potential high temperature structural material. It has the tetragonal C11b crystal structure, space group I4/mmm, with a=3.204Å and c=7.848Å. The shortest Burgers vector is <100> and such dislocations are commonly observed. The {110} planes have pseudo-hexagonal symmetry and so the next larger Burgers vectors, 1/2<111> and <110>, both have b = 4.531Å, followed by 1/2<331> and <001> both with b = 7.848Å. The easiest slip systems are {011}<100> and {110}l/2<111>. These have zero Schmid factors for crystals deformed along [001], forcing other systems such as {103}l/2<331> into operation. Here we will describe and discuss TEM observations of dislocations produced in Czochralski-grown MoSi2 single crystals by deformation along the [001] compression axis at temperatures from 1000 to 1500°C.Specimens tested at 1000°C yielded in a series of load drops starting at a stress of 680MPa and continuing to 1400MPa (the limit of the machine) when the plastic strain was 0.3%.
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28

Yoon, Jin-Kook, Gyeung-Ho Kim, Ji-Young Byun, Jae-Soo Kim, and Chong-Sool Choi. "Simultaneous growth mechanism of intermediate silicides in MoSi2/Mo system." Surface and Coatings Technology 148, no. 2-3 (December 2001): 129–35. http://dx.doi.org/10.1016/s0257-8972(01)01354-8.

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29

Schlichting, J. "High temperature oxidation of disilicides in the system MoSi2TiSi2." Ceramics International 11, no. 4 (October 1985): 136. http://dx.doi.org/10.1016/0272-8842(85)90127-0.

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30

Petrova, Vera, and Siegfried Schmauder. "Modelling of Thermal Fracture of Functionally Graded/Homogeneous Bimaterial Structures under Thermo-Mechanical Loading." Key Engineering Materials 592-593 (November 2013): 145–48. http://dx.doi.org/10.4028/www.scientific.net/kem.592-593.145.

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Mathematical modeling of thermal fracture of functionally graded/homogeneous bimaterial structures with a system of arbitrarily located cracks is performed and based on the previously suggested theoretical approach [1-which used the integral equation method. It is supposed that the structure is subjected to thermal loading (a thermal flux) and mechanical loading (a tension). The properties of the functionally graded material (FGM) are described by a continuous exponential function. The main fracture characteristics (stress intensity factors and fracture angles) are presented as functions of the geometry of the problem and special inhomogeneity parameters of FGMs. Some typical crack patterns for FGM/homogeneous bimaterial structures resulting from experiments available in literature are studied in detail. Thermal fracture of actual material combinations of FGMs such as: ceramic/ceramic, e.g., TiC/SiC, MoSi2/Al2O3and MoSi2/SiC, and also ceramic/metal FGMs, e.g., zirconia/nickel and zirconia/steel, is investigated.
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31

Liu, Yan Bo, Quan Sheng Wang, Kang Zhi Ma, Jun Liang Liu, Si Hao Wei, and Wen Chao Fan. "Anti-Ablation Property of MoSi2 Coatings Deposited by APS." Materials Science Forum 789 (April 2014): 522–29. http://dx.doi.org/10.4028/www.scientific.net/msf.789.522.

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Carbon fiber reinforced carbon matrix composites (C/C) have received much attention due to their excellent high-temperature strength, high thermal conductivity, low coefficient of thermal expansion (CTE), good thermal shock resistance. However, the poor ablation resistance of the C/C restricts its high temperature ablating applications. Making a thin anti-ablation coating on the C/C has been proved to improve the performance effectively. In order to improve the anti-ablation property of the composite, MoSi2 coatings were deposited by Atmosphere Plasma Spraying (APS) on the SiC covered C/C matrix. The SiC coatings were prepared by pack cementation. Oxyacetylene flame torch was selected to simulate the ablation situation. The ablation temperature was 1800°C. XRD and SEM were employed to discover the diversification of the coatings structure and composition. And the mechanism of anti-ablation of the MoSi2 coatings system was investigated in this paper.
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32

Courtright, E. L. "A comparison of MoSi2 matrix composites with other silicon-base composite systems." Materials Science and Engineering: A 261, no. 1-2 (March 1999): 53–63. http://dx.doi.org/10.1016/s0921-5093(98)01049-1.

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33

Habchi, Georges. "Modelling and simulation: Analysis, design and optimisation of industrial systems [MOSIM’01]." Simulation Modelling Practice and Theory 11, no. 1 (March 2003): 1–3. http://dx.doi.org/10.1016/s1569-190x(03)00039-x.

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34

Henžel, M., Peter Zimovčák, Ján Dusza, András Juhász, and Janos Lendvai. "Indentation Testing of MoSi2." Key Engineering Materials 290 (July 2005): 288–91. http://dx.doi.org/10.4028/www.scientific.net/kem.290.288.

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Indentation methods have been used for the study of the hardness and deformation characteristics MoSi2. Micro-nanoindentation tests at loads from 10 mN to 2000 mN were carried out using the depth-sensing method. Measurements of the microhardness using conventional Vickers method was carried out at loads of 500 mN, 1000 mN and 2000 mN. The Universal (Martens), Plastic and conventional Vickers hardness values were calculated at different indentation loads. Evident indentation load - size effect was found in both materials. According to the results, the pre-strain reduces the micro-nano hardness values, probably due to the activation of slip systems during the high-temperature deformation.
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35

Ma, Qin, Juan Hong Ren, and Hui Chen. "Phase and Crystal Structure Evolution of MoSi2-AlCr2 Quasibinary System Alloys." Advanced Materials Research 476-478 (February 2012): 734–38. http://dx.doi.org/10.4028/www.scientific.net/amr.476-478.734.

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On the principle of alloying modification of the same crystal structure compound, MoSi2-AlCr2quasibinary system alloys were prepared by mechanical activation and hot pressed sintering.The phase composition and crystal structure evolution were investigated by X-ray diffractometer(XRD).The results showed that the main phase composition of alloys were MoSi2and Mo(Si,Al)2,the crystal structure was gradually transformed from tetragonal C11bMoSi2to hexagonal C40 Mo(Si,Al)2. (Mo,Cr)(Si,Al)2phase has not found in alloys.
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36

Podchernyaeva, I. A., O. N. Grigor’ev, A. D. Panasyuk, and D. V. Yurechko. "High-temperature laser coatings of the ZrB2–MoSi2 system on graphite." Journal of Superhard Materials 38, no. 5 (September 2016): 327–36. http://dx.doi.org/10.3103/s106345761605004x.

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37

Javidi, Bahram, Xin Shen, Adam S. Markman, Pedro Latorre-Carmona, Adolfo Martinez-Uso, Jose Martinez Sotoca, Filiberto Pla, et al. "Multidimensional Optical Sensing and Imaging System (MOSIS): From Macroscales to Microscales." Proceedings of the IEEE 105, no. 5 (May 2017): 850–75. http://dx.doi.org/10.1109/jproc.2017.2654318.

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38

Glushko, P. I., V. I. Zmii, N. A. Semenov, A. A. Sushchaya, V. I. Sheremet, and B. M. Shirokov. "Interaction in the MoSi2–W system at 1500 to 1800°C." Powder Metallurgy and Metal Ceramics 48, no. 1-2 (January 2009): 88–92. http://dx.doi.org/10.1007/s11106-009-9092-0.

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39

ROTH, YUVAL, and RAMESH JAIN. "SIMULATION AND EXPECTATION IN SENSOR-BASED SYSTEMS." International Journal of Pattern Recognition and Artificial Intelligence 07, no. 01 (February 1993): 145–73. http://dx.doi.org/10.1142/s0218001493000091.

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Simulations have traditionally been used as off-line tools for examining process models and experimenting with system models for which it would have been either impossible or too dangerous, expensive, or time-consuming, to perform with physical systems. We propose a novel way of regarding simulations as part of both the development and the working phases of systems. In our approach simulation is used within the processing and control loop of the system to provide sensor and state expectations. This minimizes the inverse sensory data analysis and model maintenance problems. We refer to this mode of operation as the verification mode, in contrast to the traditional discovery mode. In order to provide simulations and planning that are intertwined with the control of a physical system, temporal issues have to be considered. By limiting the focus of the system to small portions of complex models which are temporarily relevant to the system’s operation, the system is able to maintain its models and respond faster. For this we employ the Context-based Caching (CbC) mechanism within our Mobile Platform Control and Simulation Program (MOSIM). CbC is a knowledge management technique which maintains large knowledge bases by making the necessary information available at the right time.
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40

Krishnarao, R. V., V. V. Ramarao, and Y. R. Mahajan. "In situ formation of MoSi2–SiC through reaction of SiO2 or Si3N4 with Mo and carbon." Journal of Materials Research 12, no. 12 (December 1997): 3322–27. http://dx.doi.org/10.1557/jmr.1997.0437.

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Composite powders of molybdenum silicide–SiC were synthesized by reacting mixtures of (Mo–SiO2 –C), (Mo–Si3N4 –C), and (Mo–SiO2 –Si3N4 –C) powders at 1300 °C. In the (Mo–SiO2 –C) system Mo5Si3 and Mo3Si formed predominantly. MoSi2 formed the major constituent of the reaction product from powder mixtures containing Si3N4. Vapor-solid SiC whiskers formed in the (Mo–SiO2 –C) system. Vapor-liquid-solid whiskers of SiC and Mo5Si3C formed in (Mo–SiO2 –Si3N4–C) and (Mo–Si3N4 –C) systems, respectively. The mechanism of formation of the VLS whiskers and molybdenum silicides was identified as follows: initially a thin layer of Mo2C forms on Mo particle; the Si vapor from thermal decomposition of Si3N4 deposits on the Mo2C surface and forms a droplet of ternary “Nowotny phase” Mo<5Si3C<1; an SiC/Mo5Si3C whisker forms by nucleation and growth from the supersaturated ternary phase; after reaction with the Mo2C layer, the SiO/Si vapor further reacts with Mo particle to form bulk silicides.
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41

Bolaños-Pérez, Ricardo, José Miguel Rocha-Pérez, Alejandro Díaz-Sánchez, Jaime Ramirez-Angulo, and Esteban Tlelo-Cuautle. "CMOS Analog AGC for Biomedical Applications." Electronics 9, no. 5 (May 25, 2020): 878. http://dx.doi.org/10.3390/electronics9050878.

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In this paper, we present the design of an analog Automatic Gain Control with a small silicon area and reduced power consumption using a 0.5 μ m process. The design uses a classical approach implementing the AGC system with simple blocks, such as: peak detector, difference amplifier, four-quadrant multiplier, and inversor amplifier. Those blocks were realized by using a modified Miller type OPAMP, which allows indirect compensation, while the peak detector uses a MOS diode. The AGC design is simulated using the Tanner-Eda environment and Berkeley models BSIM49 of the On-Semiconductor C5 process, and it was fabricated through the MOSIS prototyping service. The AGC system has an operation frequency of around 1 kHz, covering the range of biomedical applications, power consumption of 200 μ W, and the design occupies a silicon area of approximately 508.8 μ m × 317.7 μ m. According to the characteristics obtained at the experimental level (attack and release time), this AGC can be applied to hearing aid systems.
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42

Tkachenko, Yu G., D. Z. Yurchenko, V. N. Pavlikov, O. A. Shevchenko, and S. V. Satanin. "Structure and mechanical properties of ceramic composites of the system AlN-MoSi2." Powder Metallurgy and Metal Ceramics 33, no. 5-6 (1995): 277–81. http://dx.doi.org/10.1007/bf00560197.

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43

Galstyan, Gegham S., Hakob A. Chatilyan, Artavazd G. Kirakosyan, Suren L. Kharatyan, Alexander S. Mukasyan, and Arvind Varma. "Reaction Diffusion in Mo-Si System above the Melting Point of Silicon." Defect and Diffusion Forum 237-240 (April 2005): 873–78. http://dx.doi.org/10.4028/www.scientific.net/ddf.237-240.873.

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The results of direct kinetic measurements and SEM observations on formation of silicide phases in Mo-Si system at temperatures 1400-1700о С are presented in the work. It was shown, that the formation of MoSi2 proceeds by two different mechanisms and accordingly, two types of microstructures are formed: (i) a compact layer (usually with expressed columnar structure) by the reaction diffusion mechanism; and (ii) separated fine grains by crystallization in the volume of saturated Me-Si melt. A model of product formation is offered which allows to calculate the relative contributions of the two mechanisms of disilicide phase formation at various stages of interaction and to estimate the role each of them in the total process.
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44

Ahn, Sung H., V. Sundararajan, Charles Smith, Balaji Kannan, Roshan D’Souza, Ganping Sun, Ashish Mohole, et al. "CyberCut: An Internet-based CAD/CAM System." Journal of Computing and Information Science in Engineering 1, no. 1 (January 1, 2001): 52–59. http://dx.doi.org/10.1115/1.1351811.

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“CyberCut™” is a testbed for an Internet-based CAD/CAM system. It was specifically designed to be a networked, automated system, with a seamless communication flow from a client-side designer to a server-side machining service. The creation of CyberCut required several new software modules. These include: a) a Web-based design tool in which Design-for-Manufacturing information and machining rules constrain the designer to manufacturable parts; b) a geometric representation called SIF-DSG, for unambiguous communication between the client-side designer and the server-side process planner; c) an automated process planning system with several sub-modules that convert an incoming design to a set of tool-paths for execution on a 3-axis CNC milling machine. Using this software-pipeline, a CyberCut service, modeled on the MOSIS service for VLSI chips, has been now been launched for limited student-use at a group of cooperating universities.
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45

Smith, U. "A process-related study of the Al/MoSi2–Al double-level metallization system." Journal of Vacuum Science & Technology B: Microelectronics and Nanometer Structures 8, no. 3 (May 1990): 499. http://dx.doi.org/10.1116/1.585051.

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46

Prabhu, Mahesh K., and Irene M. N. Groot. "Low-Temperature Synthesis Strategy for MoS2 Slabs Supported on TiO2(110)." Surfaces 3, no. 4 (November 5, 2020): 605–21. http://dx.doi.org/10.3390/surfaces3040041.

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MoS2 supported on oxides like TiO2 has a broad range of applications. The atomic structure of this system is therefore very useful to study. Previous research work in this area has made use of high-temperature synthesis methods, while the preparation of an MoS2/TiO2 in very important applications, such as catalysis, makes use of a low-temperature synthesis method. In this work, we investigate a low-temperature synthesis strategy for MoS2 slabs supported on rutile TiO2(110). Using scanning tunneling microscopy and X-ray photoelectron spectroscopy, we demonstrate that not only flat MoS2 slabs with irregular shapes but also MoSx stripes with a large number of coordinatively unsaturated Mo atoms are formed. In particular, it becomes evident that, for atomic structural characterization of MoS2/TiO2 and similar oxide-supported systems grown by low-temperature synthesis methods, the surface structure of the support becomes highly relevant.
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47

RAZAVI, MANSOUR. "PREDICTION OF REACTION KINETIC IN MECHANICALLY ACTIVATED SELF-PROPAGATING HIGH-TEMPERATURE SYNTHESIS PROCESS." International Journal of Modern Physics B 26, no. 32 (December 11, 2012): 1250195. http://dx.doi.org/10.1142/s0217979212501950.

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In this paper we have tried to develop a semi-empirical formula for estimation of starting time of reactions during mechanical alloying process according to self-propagating high temperature synthesis (SHS) mechanism. For this purpose, three SHS systems containing Ti – C , Mo – Si and Si – C were selected and their behaviors were observed. Aforementioned systems were milled in a planetary ball mill equipped with temperature sensor detector of cups. Samplings were done at different times of discontinuously milling. To change mills' energy, stainless steel and tungsten carbide balls were used. In order to detect the phases and characterizations of milled powder, XRD instrument was utilized. Results showed that all productions were synthesized after sudden increase in temperature. Maximum measured temperature and critical time had up and downtrends for production of TiC , MoSi 2 and SiC , respectively. Crystalline size of milled powder had nano-meter scale. By using experimental data along with theoretical equations, a semi-empirical formula between critical time for transformation of raw materials to productions, type of milled system and ball mill parameter can be presented with high accuracy. According to calculated formula, critical time was related to ball mill energy and Gibbs free energy of milled system with direct and inverse proportionality, respectively.
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48

Graeve, O. A., E. M. Carrillo-Heian, A. Feng, and Z. A. Munir. "Modeling of wave configuration during electrically ignited combustion synthesis." Journal of Materials Research 16, no. 1 (January 2001): 93–100. http://dx.doi.org/10.1557/jmr.2001.0018.

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A model was developed to study the process of current-ignited combustion synthesis. In this process, Joule heating raises the temperature to the ignition point, at which the sample reacts to form a product. Two material systems were modeled: the synthesis of SiC and MoSi2. It was found that the mode of combustion is a function of the size (radius) of the sample. The anticipated volume combustion mode was only evident in small samples. At higher values of the radius, the mode becomes wavelike (selfpropagating high-temperature synthesis) in nature. The transition from volume to wave combustion mode also depended on the properties of the material. The results are interpreted in terms of thermal conductivity and heat-transfer conditions.
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49

Iatsyuk, I. V., A. Yu Potanin, S. I. Rupasov, and E. A. Levashov. "Kinetics and high-temperature oxidation mechanism of ceramic materials in ZrB2–SiC–MoSi2 system." Izvestiya Vuzov Tsvetnaya Metallurgiya (Proceedings of Higher Schools Nonferrous Metallurgy, no. 6 (January 1, 2017): 63–69. http://dx.doi.org/10.17073/0021-3438-2017-6-63-69.

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50

Belan, B., M. Dzevenko, M. Daszkiewicz, and R. Gladyshevskii. "Interaction of Components in the Lu-Ag-Si System at 500 ºC." Physics and Chemistry of Solid State 22, no. 1 (February 24, 2021): 88–93. http://dx.doi.org/10.15330/pcss.22.1.88-93.

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Isothermal section of the Lu-Ag-Si system at 500ºC was studied by means of X-ray powder diffraction, microstructure and EDX-analyses in the whole concentration range. The existence of earlier reported binary compounds LuAg4, LuAg2, LuAg and LuSi2, LuSi, Lu5Si3, Lu5Si4 was confirmed. New binary compound Lu3Si5 (own str. type) was found. Almost none of the binary silicides dissolve more than 5 at.% of third component. The exception is the existence of the substitution type solid solutions based on LuAg2 (MoSi2-type structure), which dissolves up to 20 at.% Si, as well as on Lu5Si3 (Mn5Si3-type structure), which dissolves up to 15 at.% Ag. The crystal structure of the LuSi compound was redetermined by X-ray single crystal diffraction (TlI-type, space group Cmcm, a = 4.1493(3), b = 10.2641(7), c = 3.7518(2) Å, R = 0.0173, wR = 0.0415 for 173 independent reflections). No ternary compound is observed in the Lu-Ag-Si system.
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