Academic literature on the topic 'New Amorphous formula'
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Journal articles on the topic "New Amorphous formula"
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Li, Xiang, Xu Zhao, Fang Lv, Fang Liu, and Yuxin Wang. "Improved corrosion resistance of new Fe-based amorphous alloys." International Journal of Modern Physics B 31, no. 16-19 (July 26, 2017): 1744010. http://dx.doi.org/10.1142/s0217979217440106.
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Developing amorphous alloys with good corrosion resistance has attracted wide interests recently. In this work, a series of Fe[Formula: see text]Ni[Formula: see text]Cu1Nb3Si[Formula: see text]B9 ([Formula: see text], 1, 2, 3 and 4 at.%) amorphous alloys are fabricated. The influence of Ni addition on the structure and corrosion resistance of the alloys in KNO3 solution was investigated. The amorphous ribbons showed excellent corrosion resistance due to the formation of a stable passive film that ensured a very large passivation plateau. The corrosion resistance is sensitive to the minor addition of Ni ([Formula: see text]4 at.%), which significantly improved the corrosion resistance according to the results of electrochemical measurements.
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Li, Jiayin, Xinping Ma, Caixian Zhao, Datang Li, and Jianting Tang. "Co4I3O24H15⋅3H2O: A new amorphous semiconductor with intrinsical photocatalytic performance in organic dye degradation driven by visible light." Functional Materials Letters 10, no. 02 (April 2017): 1750008. http://dx.doi.org/10.1142/s1793604717500084.
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Amorphous semiconductor photocatalysts are highly desirable because they are facile and low-cost to prepare in comparison with the crystalline ones. The amorphous semiconductor with photocatalytic activity has been rarely reported. In this work, a new amorphous semiconductor photocatalyst, Co4I3O[Formula: see text]H[Formula: see text][Formula: see text][Formula: see text][Formula: see text]3H2O, was successfully developed. Its microstructure is composed of irregular particles with size of 2–20[Formula: see text][Formula: see text]m. In photocatalytic degradation of rhodamine B (RhB), or methylene blue (MB) dyes driven by visible light, the Co4I3O[Formula: see text]H[Formula: see text][Formula: see text][Formula: see text][Formula: see text]3H2O sample exhibited pronounced activity. Its activity is higher than Degussa P25 (commercial TiO[Formula: see text] in RhB degradation. It was testified that the degradation of RhB is due to the intrinsical photocatalytic role of Co4I3O[Formula: see text]H[Formula: see text][Formula: see text][Formula: see text][Formula: see text]3H2O. The reusability of the Co4I3O[Formula: see text]H[Formula: see text][Formula: see text][Formula: see text][Formula: see text]3H2O photocatalyst was also investigated.
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Caffaro, M. A. Grado, and M. Grado Caffaro. "Some New Results on Vibrational Properties of Amorphous Group IV Semiconductors." Active and Passive Electronic Components 16, no. 1 (1993): 65–68. http://dx.doi.org/10.1155/1993/43719.
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For neutron scattering, an interesting formula is derived from the coherent one-phonon dynamic structure factor. In this derivation, phonon density of states is involved; this density is related to spectra due to structural disorder, which is investigated. Our considerations refer to amorphous Group IV semiconductors.
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Shen, Junyao, Yongtao Yao, Yanju Liu, and Jinsong Leng. "Amorphous Bimetallic Nanowires with High-Performance Microwave Absorption: A Case for FeCo Nanowires." Nano 14, no. 04 (April 2019): 1950041. http://dx.doi.org/10.1142/s1793292019500413.
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Amorphous FeCo nanowires (NWs) with the average diameter of 120[Formula: see text]nm were successfully prepared with a magnetic-field-assisted (MFA) hydrothermal method. Rapid reaction time was adopted to obtain amorphous FeCo NWs, being checked by XRD and TEM. Tuning the stoichiometric ratio of Fe/Co content meets the optimal impedance matching under different absorption frequency, making both improved intensities and frequency ranges of microwave absorption. For example, under 3[Formula: see text]mm coating thickness, the reflection loss (RL) peaks of Fe3Co7, Fe5Co5 and Fe7Co3 NWs are [Formula: see text]25.88[Formula: see text]dB at 4[Formula: see text]GHz, [Formula: see text]19.06[Formula: see text]dB at 4.24[Formula: see text]GHz and [Formula: see text]21.98[Formula: see text]dB at 5.44[Formula: see text]GHz. The related efficient absorption bandwidths ([Formula: see text]10 dB) of Fe3Co7 NWs, Fe5Co5 NWs and Fe7Co3 NWs are 5.40[Formula: see text]GHz, 3.52[Formula: see text]GHz and 4.91[Formula: see text]GHz, respectively. It is ascribed to integrating enhanced dielectric/conductive losses, negligible damages from eddy current effect and good impedance matching for high-performance FeCo NWs absorbers. This work paves a new path on synthesizing bimetallic wire-like nanostructures for microwave absorption demands.
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Zhu, Yuanyuan, Aiguo Zhou, Jin Jia, Junjun Wang, Jiang Liu, Baolin Xing, and Chuanxiang Zhang. "Synthesis and Gas Adsorption Properties of Carbide-Derived Carbons from Titanium Tin Carbide." Nano 11, no. 04 (April 2016): 1650040. http://dx.doi.org/10.1142/s1793292016500405.
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Here we reported the synthesis of nanoporous carbide-derived carbons (CDCs) from a new precursor, titanium tin carbides (Ti2SnC), via chlorination at 400–1100[Formula: see text]C. At low chlorination temperature (400–500[Formula: see text]C), as-synthesized CDCs mainly consisted of amorphous carbon and chlorides. As the chlorination temperature increased up to 600[Formula: see text]C, chlorides disappeared, and the main composition of CDCs was amorphous carbon. At high chlorination temperature, there was a trend of graphitization. The microstructure of CDCs was observed and characterized by scanning electron microscopy and transmission electron microscopy. Some graphite-like sheet structures in CDCs were found. Specific surface area (SSA) and pore volume of CDCs increased with chlorination temperature, except an abnormal decrease of the CDC chlorinated at 900[Formula: see text]C. CDC chlorinated at 1100[Formula: see text]C had the largest SSA, 1580[Formula: see text]m2/g. In order to apply these materials as novel hydrogen/methane storage media in the area of energy efficient transport, gas adsorption properties of CDCs were measured. For CDC chlorinated at 1100[Formula: see text]C, pore volume uptakes are [Formula: see text][Formula: see text]cm3/g at 60 bar (25[Formula: see text]C) for methane, and [Formula: see text][Formula: see text]cm3/g at 35 bar ([Formula: see text]C) for hydrogen, respectively. It was suggested that CDCs from Ti2SnC are promising materials for hydrogen/methane adsorptive storage.
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Wen, Quanwu, Shaohua Zhang, Mingwei Sun, and Rencheng Jin. "Fabrication of MnFe2O4 and MnCO3 Nanoparticles Anchored on Amorphous Carbon-Coated Carbon Nanotubes for High-Performance Lithium Batteries and Supercapacitors." Nano 13, no. 05 (May 2018): 1850050. http://dx.doi.org/10.1142/s1793292018500509.
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Transition metal oxides as Li-ion batteries (LIBs) anodes have attracted much attention because of their high theoretical capacity. However, the large volume change and low electrical conductivity still hinder their application in LIBs. In this work, a new strategy is proposed to enhance the electrochemical performance by anchoring ultrafine MnFe2O4 and MnCO3 ([Formula: see text][Formula: see text]nm) on amorphous carbon-coated carbon nanotubes. Benefiting from the unique structure, the electrode displays excellent cyclability with a reversible specific capacity of 1012[Formula: see text]mAh g[Formula: see text] at 0.1[Formula: see text]A g[Formula: see text] after 100 cycles and outstanding rate performance accompanied by a high specific capacity of 568[Formula: see text]mAh g[Formula: see text] at 5[Formula: see text]A g[Formula: see text] as anode for lithium batteries. When evaluated as supercapacitors, the electrode delivers the specific capacitance of 588.9[Formula: see text]F g[Formula: see text] at a current density of 1[Formula: see text]A g[Formula: see text] and maintains the capacitance retention 94.7% after 4000 cycles at 5[Formula: see text]A g[Formula: see text].
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Huseynov, Elchin M. "Permittivity-Frequency Dependencies Study of Neutron-Irradiated Nanocrystalline Silicon Carbide (3C-SiC)." Nano 12, no. 06 (April 4, 2017): 1750068. http://dx.doi.org/10.1142/s1793292017500680.
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Nanocrystalline 3C-SiC was irradiated by neutron flux ([Formula: see text] n[Formula: see text][Formula: see text][Formula: see text]cm[Formula: see text]s[Formula: see text] up to 20[Formula: see text]h in the TRIGA Mark II type research reactor. The experiments have been conducted in the 0.1[Formula: see text]Hz–2.5[Formula: see text]MHz frequency and 100–400[Formula: see text]K temperature ranges. The frequency dependencies of real and imaginary parts of the permittivity of nanomaterial were analyzed comparatively before and after neutron irradiation. After neutron irradiation, there was increase in dopant element concentration in the nanocrystalline 3C-SiC particles. Concentration of new dopant elements in the 3C-SiC nanomaterial directly affects dielectric polarization and leads to increased permittivity. Simultaneously, after neutron irradiation, agglomeration and amorphous transformation influence on the polarization of nanocrystalline 3C-SiC. Moreover, 3C-SiC nanoparticle interface polarization gives rise to dispersion. It was found that ionic polarization was dominant in the nanocrystalline 3C-SiC particles.
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Nath, K. V. Surendra, and S. N. Tandon. "Synthesis and characterization of a new crystalline tin(IV) arsenophosphate ion exchanger." Canadian Journal of Chemistry 68, no. 2 (February 1, 1990): 346–49. http://dx.doi.org/10.1139/v90-050.
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A new crystalline layered inorganic ion exchanger tin(IV) arsenophosphate with the formula Sn(HAsO4)(HPO4)•H2O has been prepared by refluxing the amorphous precursor. This exchanger has been characterized by X-ray powder pattern, chemical analysis, IR spectra, and thermal dehydration. Its ion exchange behaviour towards sodium ions is reported. The exchanger has an exchange capacity of 5.36 mequiv./g for Na+. The performance of tin(IV) arsenophosphate is compared with crystalline tin(IV) phosphate and arsenate. Keywords: cation exchanger, crystalline tin(IV) arsenophosphate, ion exchange, thermal behaviour, X-ray studies.
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Toraya, Hideo, and Kazuhiko Omote. "Quantitative phase analysis of amorphous components in mixtures by using the direct-derivation method." Journal of Applied Crystallography 52, no. 1 (February 1, 2019): 13–22. http://dx.doi.org/10.1107/s1600576718016394.
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The direct-derivation (DD) method is a new technique for quantitative phase analysis (QPA) [Toraya (2016). J. Appl. Cryst. 49, 1508–1516]. A simple equation, called the intensity–composition (IC) formula, is used to derive weight fractions of individual components (w k ; k = 1–K) in a mixture. Two kinds of parameters are required as input data of the formula. One is the parameter S k , which is the sum of observed powder diffraction intensities for each component, measured in a wide 2θ range and corrected for the Lorentz–polarization factor. The other is the parameter a k −1, defined by a k −1 = M k −1∑nik 2, where M k is the chemical formula weight and n ik is the number of electrons belonging to the ith atom in the chemical formula unit. The parameter a k −1 was originally derived by using the relationship between the peak height and the integrated value of the peak at the origin of the Patterson function, implicitly assuming the presence of periodic structures like crystals. In this study, the formula has been derived theoretically from a general assemblage of atoms resembling amorphous material, and the same expression as the original formula has been obtained. The physical meaning of a k −1, which represents `the total scattering power per chemical formula weight', has been reconfirmed in the present formulation. The IC formula has been tested experimentally by using two-, three- and four-component mixtures containing SiO2 or GeO2 glass powder. In the whole-powder-pattern fitting (WPPF) procedure, incorporated into the DD method, a background-subtracted halo pattern is directly fitted as one of the components in the mixture, together with profile models for crystalline components. In the WPPF, an interaction was observed between the parameters of the background function (BGF) and the parameter for scaling the halo pattern, and this resulted in systematic deviations of w k from weighed values. The deviations were ≤0.7% in the case of binary mixtures when the BGF was fixed at the correct background height, supporting the hypothesis that the DD method is applicable to the QPA of amorphous components.
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Bernard, Samuel, Markus Weinmann, David Cornu, and Philippe Miele. "A New Generation of Boron-Based Ceramic Fibers: Design, Processing and Properties of SilicoBoron CarboNitride (SiBCN) Fibers from Boron-Modified Polyvinylsilazanes." Advances in Science and Technology 50 (October 2006): 9–16. http://dx.doi.org/10.4028/www.scientific.net/ast.50.9.
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Boron-modified polyvinylsilazanes have been studied for suitability as fiber precursor. A melt-tractable polymer displaying Si- and N-bonded methyl groups was successfully processed into green fibers ~18μm in diameter via a melt-spinning process. After the shaping process, the use of an ammonia curing atmosphere at 200°C allowed to increase the ceramic yield of the polymer, then avoid inter-fiber fusion during the further increase of the temperature. As-cured fibers were annealed in the temperature range 1000-1800°C in a nitrogen atmosphere to provide SiBCN ceramic fibers black colored, of flexible form and ~12μm in diameter in different crystallinity states going from totally amorphous below 1600°C to well-crystallized at 1800°C. The excellent strength retention after heat-treatment at 1600°C (1.3-1.5GPa) is clearly related to the high amorphous stability of fibers. Elemental compositions of such amorphous fibers showed a typical chemical formula of Si3.0B1.0C5.0N2.4. Between 1600°C and 1700°C, the fiber strength decreased to 0.9GPa then dropped to about one-quarter the original value at 1800°C while structural changes were evident by XRD analysis.
Dissertations / Theses on the topic "New Amorphous formula"
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Rackovská, Anna Patrícia. "Studium optických vlastností tenkých vrstev prekurzorů pro přípravu monokrystalů perovskitů MAPbBr3." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2021. http://www.nusl.cz/ntk/nusl-445137.
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This diploma thesis is focused on preparation of perovskite methylammonium lead bromide thin film layers and also thin film layers of its precursors, namely methylammonium bromide and lead(II) bromide, by spin-coating from the solution; and optical characterisation of the prepared thin film layers by UV-VIS spectroscopy and spectroscopical ellipsometry. Methylammonium bromide does not absorb in visible nor ultraviolet region, the maximum absorption of lead(II) bromide occurred in ultraviolet region, methylammonium lead bromide absorbs in visible region. Optical band gaps were determined by Tauc method to (3,5 ± 0,1) eV for lead(II) bromide and 2,15 eV, respectively 2,25 eV for perovskite. Refractive indices and extinction coefficients were determined by ellipsometry in range of wavelengths from 290 nm to 830 nm and their dependence with layer thickness was discussed. Ellipsometry model used in this thesis consist on Tauc-Lorentz oscillators for methylammonium bromide, methylammonium lead bromide and partially for lead(II) bromide, which another part is formed by New Amorphous oscillator.
Conference papers on the topic "New Amorphous formula"
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Farmer, J. C., J. J. Haslam, S. D. Day, T. Lian, R. Rebak, N. Yang, and L. Aprigliano. "Corrosion Resistance of Iron-Based Amorphous Metal Coatings." In ASME 2006 Pressure Vessels and Piping/ICPVT-11 Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/pvp2006-icpvt-11-93835.
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New amorphous-metal thermal-spray coatings have been developed recently that may provide a viable coating option for spent nuclear fuel & high-level waste repositories [Pang et al. 2002; Shinimiya et al. 2005; Ponnambalam et al. 2004; Branagan et al. 2000–2004]. Some Fe-based amorphous-metal formulations have been found to have corrosion resistance comparable to that of high-performance alloys such as Ni-based Alloy C-22 [Farmer et al. 2004–2006]. These materials rely on Cr, Mo and W for enhanced corrosion resistance, while B is added to promote glass formation and Y is added to lower the critical cooling rate (CCR). Materials discussed in this paper include yttrium-containing SAM1651 with CCR ∼ 80 K/s and yttrium-free Formula 2C with CCR ∼ 600 K/s. While nickel-based Alloy C-22 and Type 316L stainless steel lose their resistance to corrosion during thermal spraying, Fe-based SAM1651 and Formula 2C amorphous-metal coatings can be applied with thermal spray processes without any significant loss of corrosion resistance. In the future, such corrosion-resistant thermal-spray coatings may enable the development of less expensive containers for spent nuclear fuel (SNF) and high-level waste (HLW), including enhanced multipurpose containers (MPCs), protected closure welds, and shields to protect containers from drips and falling rocks. These materials are extremely hard and provide enhanced resistance to abrasion and gouges from backfill operations. For example, Type 316L stainless steel has a hardness of approximately 150 VHN, Alloy C-22 has a hardness of approximately 250 VHN, while the Fe-based amorphous metals typically have hardness values of 1100–1300 VHN. Both Formula 2C and SAM1651 have high boron content which allow them to absorb neutrons, and therefore be used for enhanced criticality control. Cost savings can also be realized through the substitution of Fe-based alloy for Ni-based materials. Applications are also envisioned in oil & gas industry.