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Journal articles on the topic 'Bcc Co'

Author: Grafiati

Published: 28 June 2021

Last updated: 1 February 2022

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1

Nishioka, Shingo, Rie Matsumoto, Hiroyuki Tomita, Takayuki Nozaki, Yoshishige Suzuki, Hiroyoshi Itoh, and Shinji Yuasa. "Spin dependent tunneling spectroscopy in single crystalline bcc-Co/MgO/bcc-Co(001) junctions." Applied Physics Letters 93, no. 12 (September 22, 2008): 122511. http://dx.doi.org/10.1063/1.2988647.

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2

Kamada, Y., K. Sugimoto, and M. Matsui. "Magnetoresistance Effect of Co/bcc-Cr, Ni/bcc-Cr Artificial Superlattices." Journal of the Magnetics Society of Japan 21, no. 4_2 (1997): 549–52. http://dx.doi.org/10.3379/jmsjmag.21.549.

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3

Sandratskii, L. M., and J. Kübler. "Local magnetic moments in bcc Co." Physical Review B 47, no. 10 (March 1, 1993): 5854–60. http://dx.doi.org/10.1103/physrevb.47.5854.

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4

Idzerda, Y. U., D. M. Lind, D. A. Papaconstantopoulos, G. A. Prinz, B. T. Jonker, and J. J. Krebs. "Stoner excitations in bcc Co (invited)." Journal of Applied Physics 64, no. 10 (November 15, 1988): 5921–26. http://dx.doi.org/10.1063/1.342175.

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5

Bland, J. A. C., R. D. Bateson, P. C. Riedi, R. G. Graham, H. J. Lauter, J. Penfold, and C. Shackleton. "Magnetic properties of bcc Co films." Journal of Applied Physics 69, no. 8 (April 15, 1991): 4989–91. http://dx.doi.org/10.1063/1.348197.

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6

Bauer, Rico, E. Bischoff, and Eric J. Mittemeijer. "Precipitation of Co in Supersaturated Au-Based Au-Co Alloys; Microstructural Evolution and Transformation Kinetics." Solid State Phenomena 172-174 (June 2011): 390–95. http://dx.doi.org/10.4028/www.scientific.net/ssp.172-174.390.

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Natural formation of the unusual bcc modification for Co was demonstrated to occur upon precipitation of Co in supersaturated Au90Co10alloy, applying high resolution transmission electron microscopy. The bcc Co phase precipitates as thin (0.5 – 1 nm) plates along {100} habit planes, exhibiting the orientation relationship: {100}Au,fcc//{100}Co,bccand <001>Au,fcc//<011>Co,bcc. Prolonged annealing induces a Bain type transformation from bcc Co into fcc Co. The precipitation kinetics of Co in supersaturated solid solutions of Au90Co10was investigated by DSC upon isothermal annealing at temperatures in the range 567 K to 612 K and upon isochronal annealing at heating rates in the range 5 to 40 K·min‑1. Results of the fitting of a modular model of transformation kinetics to, simultaneously, all isothermal DSC runs and to, simultaneously, all isochronal DSC runs, could be discussed in terms of the different extents of the effects of quenched‑in defects on isothermally and isochronally conducted transformations.

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7

Kim, Chiho, and Yong-Chae Chung. "Interfacial Spin Polarization and Magnetic Structure of Co/MgO/Co Magnetic Tunnel Junction: Ab Initio Calculation." Journal of Nanoscience and Nanotechnology 8, no. 4 (April 1, 2008): 2016–21. http://dx.doi.org/10.1166/jnn.2008.050.

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Using ab initio method based on the density functional theory, the equilibrium bcc-Co(001)/rocksalt-MgO(001)/bcc-Co(001) magnetic tunnel junction structure was investigated. Spin polarization and magnetic moment were calculated for each atomic slab in the equilibrium structure by spin dependent density of states analysis. Interfacial Co atoms showed significantly larger spin polarization of –88.3%, compared to the value of inner Co slabs, –82.3%, and bulk bcc Co, –82.1%. Interestingly, Mg and O atoms also showed induced spin polarizability ranged from –45.0% to –66.0%, except for O atoms in the centered slab of barrier layer, which showed relatively small polarization, –14.9%. Magnetic moments for the electrode Co atoms were calculated to be ∼1.74 μB with no significant variation across the electrode.

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8

Methfessel, T., and H. J. Elmers. "Reconstructed bcc Co films on the surface." Surface Science 601, no. 21 (November 2007): 5026–33. http://dx.doi.org/10.1016/j.susc.2007.09.006.

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9

Dekoster, J., E. Jedryka, C. Mény, and G. Langouche. "Epitaxial growth of bcc Co/Fe superlattices." Journal of Magnetism and Magnetic Materials 121, no. 1-3 (March 1993): 69–72. http://dx.doi.org/10.1016/0304-8853(93)91151-v.

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10

Zhang, Y., Y. Tsushio, Hirotoshi Enoki, and Etsuo Akiba. "Hydrogenation Properties of Mg-Co and Its Related Alloys." Materials Science Forum 475-479 (January 2005): 2453–56. http://dx.doi.org/10.4028/www.scientific.net/msf.475-479.2453.

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Novel Mg-Co binary alloys with BCC (body-centered cubic) structure have been successfully synthesized by means of mechanical alloying technique. The formation of BCC structure was confirmed by X-ray diffraction and transmission electron microscopy. Mg-Co alloys were found in the range of Co concentration between 37 and 80 atomic %. All the Mg-Co alloys synthesized absorbed hydrogen below 373K. The maximum hydrogen capacity of these alloys reaches 2.7 mass %. However, desorption of hydrogen at 373 K has not been observed yet. Mg- Co-X (X = B and Ni) ternary alloys with BCC structure have also been synthesized. The lattice parameter of both alloys is lower than that of Mg-Co binary alloys, meanwhile the maximum hydrogen content of both alloys also decreased.

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11

Inoue, Akihisa, and Baolong Shen. "Soft Magnetic Properties of Nanocrystalline Fe–Co–B–Si–Nb–Cu Alloys in Ribbon and Bulk Forms." Journal of Materials Research 18, no. 12 (December 2003): 2799–806. http://dx.doi.org/10.1557/jmr.2003.0390.

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Ribbon and bulk nanocrystalline body-centered-cubic (bcc) (Fe,Co) alloys exhibiting good soft magnetic properties were synthesized in Fe71.5-xCoxB13.5Si10Nb4Cu1 system by the simple production processes of melt-spinning or casting and annealing. The glass-type alloys were formed in the Co content range below 30 at.%. These glassy alloys crystallized through two exothermic reactions. The first stage was due to the precipitation of nanoscale bcc-(Fe,Co) phase with a grain size of about 10 nm, and the second stage resulted from the decomposition of the remaining amorphous phase to α–(Fe,Co), (Fe,Co)2B, (Fe,Co)23B6, (Fe,Co)3Si, and (Fe,Co)2Nb phases. The glass transition temperature increased from 820 to 827 K with increasing Co content from 5 to 20 at.%, while the supercooled liquid region decreased slightly from 37 to 30 K because of the nearly constant crystallization temperature. By choosing the 10 at.% Co-containing alloy, we produced cylindrical glassy alloy rods 1.0 and 1.5 mm in diameter by copper mold casting. The subsequent annealing for 300 s at 883 K corresponding to the temperature just above the first exothermic peak caused the formation of nanoscale bcc-(Fe,Co) structure. The bcc-(Fe,Co) alloy rods exhibited good soft magnetic properties of 1.26 T for saturation magnetization and 5.0 A/m for coercive force, which were comparable to those for the corresponding bcc-(Fe,Co) alloy ribbon. The nanocrystalline alloy in a bulk form is encouraging for future use as a new type of soft magnetic material that requires three-dimensional shapes.

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12

Ohtake, Mitsuru, Shigeyuki Minakawa, and Masaaki Futamoto. "Preparation of 3d Ferromagnetic Transition Metal Thin Films with Metastable bcc Structure on GaAs(100) Substrates." Key Engineering Materials 605 (April 2014): 478–82. http://dx.doi.org/10.4028/www.scientific.net/kem.605.478.

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Ni, permalloy (Py: Ni - 20 at. % Fe), and Co films of 40 nm thickness are prepared on GaAs (100) single-crystal substrates at room temperature and 200 °C by magnetron sputtering. The growth behavior and crystallographic properties are studied. In early stages of film growth, metastable bcc single-crystals nucleate on the substrates for all the film materials. The crystal structure is stabilized through hetero-epitaxial growth. With increasing the thickness beyond 2 nm, the bcc structure starts to transform into fcc or hcp structure through atomic displacements parallel to the bcc {110} close-packed planes. The transformation orientation relationships are fcc {111}<10>, hcp {0001}<110> || bcc {110}<001>. The resulting Ni and Py films consist of a mixture of bcc and fcc phases, whereas the Co films involve an hcp phase in addition to the metastable bcc phase.

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13

Shen, Baolong, and Akihisa Inoue. "Soft magnetic properties of bulk nanocrystalline Fe–Co–B–Si–Nb–Cu alloy with high saturated magnetization of 1.35 T." Journal of Materials Research 19, no. 9 (September 2004): 2549–52. http://dx.doi.org/10.1557/jmr.2004.0360.

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Bulk nanocrystalline body-centered cubic- (bcc) (Fe,Co) alloy with high saturated magnetization and good soft magnetic properties was synthesized by the simple process of casting and annealing for the glass-type Fe62.8Co10B13.5Si10Nb3Cu0.7 alloy. It crystallizes through two exothermic reactions. The cylindrical glassy rod with the diameter of 1.5 mm was produced by copper mold casting. The subsequent annealing at the temperature higher than that of the first exothermic peak causes the formation of bcc-(Fe,Co) nanocrystalline with particle sizes between 10 and 15 nm. The bcc-(Fe,Co) alloy rods exhibit good soft magnetic properties of 1.35 T for saturation magnetization and 5 A/m for coercive force.

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14

Blomqvist, P., and R. Wäppling. "Structural properties of ultrathin bcc Co (001) layers." Journal of Crystal Growth 252, no. 1-3 (May 2003): 120–27. http://dx.doi.org/10.1016/s0022-0248(03)00885-6.

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15

Hafermann, H., R. Bručas, I. L. Soroka, M. I. Katsnelson, D. Iuşan, B. Sanyal, O. Eriksson, and B. Hjörvarsson. "Competing anisotropies in bcc Fe81Ni19/Co(001) superlattices." Applied Physics Letters 94, no. 7 (February 16, 2009): 073102. http://dx.doi.org/10.1063/1.3081107.

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16

Dekoster, J., E. Jedryka, M. Wójcik, and G. Langouche. "Structure and magnetism in bcc Co/Fe superlattices." Journal of Magnetism and Magnetic Materials 126, no. 1-3 (September 1993): 12–15. http://dx.doi.org/10.1016/0304-8853(93)90531-6.

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17

Romano, Daniel. "Perception of BCC-algebras under the Bishops principled-philosophical orientation: BCC-algebra with apartness." Filomat 33, no. 19 (2019): 6369–80. http://dx.doi.org/10.2298/fil1919369r.

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In this paper it is given a short introduction in a reconsideration about BCC-algebras under the light of Bishop?s principled-philosophical orientation. At the first, it is introduced the concept of BCC-algebras into this orientation. Additionally, the consequences of the selected axioms in the determination of BCC-algebras with apartness are analyzed. Also, some substructures in the BCC-algebras with apartness that have no counterparts in the classical case and which appear as products of the chosen logical environment such as co-ideals are analyzed. At the end, two different results that can be viewed as the isomorphism theorem in for BCC-algebras are exposed.

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18

Kozakai, Takao, Tadaaki Shikama, Toshiyuki Koyama, and Minoru Doi. "Metastable Two-Phase Field(A2+B2) in Co-Al-Fe and Co-Al Alloy Systems." Materials Science Forum 449-452 (March 2004): 61–64. http://dx.doi.org/10.4028/www.scientific.net/msf.449-452.61.

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Precipitation of disordered bcc Co (A2) particles has been investigated in Co-rich B2 ordered Co-Al-Fe and Co-Al alloys by means of a macroscopic composition gradient method using a transmission electron microscope. When Co-Al-Fe ternary and Co-Al binary alloys were annealed at 823-1023K for a relatively short time, bcc disordered particles precipitated within B2 ordered matrix, followed by the formation of equilibrium fcc α-Co (A1) on the phase boundaries. The precipitation limit of metastable A2 phase was evaluated using the binary and ternary specimens with macroscopic compositional gradient. As a result, it was found that the limits are located within the equilibrium A1+B2 two-phase fields in both ternary and binary alloy systems, and that the limit curve on the isothermal section at 923K for Co-Al-Fe system successfully connects with the phase boundary of A2+B2 two-phase field at the Co-Fe binary side of the ternary system.

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19

Resali, Nor Azrina, Koay Mei Hyie, Wan Normimi Roslini Abdullah, and Nor Hayati Saad. "Morphological Studies of Electrodeposited Cobalt Based Coatings: Effect of Alloying Elements." Advanced Materials Research 938 (June 2014): 52–57. http://dx.doi.org/10.4028/www.scientific.net/amr.938.52.

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Electrodeposition is known as a simple and low-cost method to synthesize good-quality coating with excellent hardness. In this work, the morphology changes on Cobalt coating with the addition of iron and nickel elements were investigated. Co (Cobalt) and Co-based alloy coatings were prepared by electrodeposition technique using sulfate-based electrolytes. The process was conducted at 50°C temperature in an acidic environment (pH 3). The pure Co coating shows the tendency to form snowflake-like morphology structure. The dendritic morphology appeared in the Co-Fe coatings. However, the dendritic morphology was totally disappeared in the Co-Ni-Fe morphology and replaced by spherical morphology. The crystal structure of Co-Ni-Fe coating changed from bcc into mixed bcc+fcc structure with the addition of Ni element in Co-Fe composition. The Ni element which had been introduced in the Co-Fe composition improved the surface morphology and reduced the average particle size. The surface morphologies in the coatings affect the particles size and hardness property. This may due to the formation of full, compact coatings morphology and introduction of particles boundaries interphase. The Co-Ni-Fe coating with smaller particle size, less void formation and mixed crystal structure of bcc+fcc was roughly two times harder than pure Co.

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20

Wittig, J. E., J. F. Al-Sharab, J. Bentley, N. D. Evans, T. P. Nolan, and R. Sinclair. "Quantitative EFTEM of Cr Grain Boundary Segregation in Cocrta." Microscopy and Microanalysis 7, S2 (August 2001): 298–99. http://dx.doi.org/10.1017/s1431927600027562.

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Grain boundary Cr segregation provides magnetic isolation between the crystals in sputtered Co thin films used for longitudinal magnetic recording. Magnetic isolation decouples individual grains in order to increase coercivity, lower media noise, and allow for higher recording densities. These sputtered Co alloys grow with a strong [1120] texture owing to a body centered cubic (BCC) Cr underlayer. The sputtered Cr seed-layer has a [001]BCC growth texture and the BCC {110}cr planes lattice match with the hexagonal (0002)cr planes. This produces the desired condition of the easy axis of magnetization, [0001]co, in the plane of the magnetic layer. However, since two orthogonal orientations of the {110}cr planes exist parallel to the [001]cr growth direction, it is possible to nucleate two hexagonal Co grains with orthogonal variants of the c-axis that will impinge to form a 90° grain boundary. The well defined crystallographic texture of the Co-alloy thin film with random angle and 90° grain boundaries presents an opportunity to study the effects of boundary character on Cr segregation in hexagonal crystals.

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21

Prinz, G. A. "Stabilization of bcc Co via Epitaxial Growth on GaAs." Physical Review Letters 54, no. 10 (March 11, 1985): 1051–54. http://dx.doi.org/10.1103/physrevlett.54.1051.

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22

Lee, J. I., C. L. Fu, and A. J. Freeman. "Electronic structure and magnetism of metastable bcc Co(001)." Journal of Magnetism and Magnetic Materials 62, no. 1 (November 1986): 93–100. http://dx.doi.org/10.1016/0304-8853(86)90739-0.

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23

Abrosimova, G. E., N. A. Volkov, E. A. Pershina, V. V. Chirkova, I. A. Sholin, and A. S. Aronin. "Formation of bcc nanocrystals in Co-based amorphous alloys." Journal of Non-Crystalline Solids 565 (August 2021): 120864. http://dx.doi.org/10.1016/j.jnoncrysol.2021.120864.

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24

Yasuda, Hiroyuki Y., Kentaro Soma, and Yoshiaki Odawara. "Deformation Behavior of Fe-Al-Co Single Crystals Containing CoAl Precipitates." Materials Science Forum 783-786 (May 2014): 2869–74. http://dx.doi.org/10.4028/www.scientific.net/msf.783-786.2869.

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The effect of the CoAl precipitates on the deformation behavior of Fe-15.0Al-15.0Co (at.%) single crystals was examined. The spherical CoAl phase with the B2 structure was precipitated in the single crystals and was stable below 974 K. The bcc matrix and CoAl phase satisfied the cube-on-cube orientation relationship with a misfit strain of 0.25%. The single crystals showed a high yield stress up to 923 K while the stress dropped at 1023 K due to the dissolution of the CoAl phase into the matrix. Moreover, the activated sip system of the crystals containing the CoAl precipitates depended strongly on loading axis. At <149> orientation, {101} <111> slip favorable for the bcc matrix and the CoAl precipitates were sheared by a pair of 1/2<111> dislocations without forming Orowan loops. The CoAl single phase was known to hardly deform by <111> slip which resulted in high strength at <149> orientation. In contrast, {010} <001> or {hk0} <001> slip favorable for the CoAl precipitates was activated at <011> orientation, although the volume fraction of the CoAl phase was very small. <001> slip was generally impossible to take place in the bcc matrix, leading to the extreme hardening. Therefore, the difference in primary slip system between the bcc matrix and CoAl precipitates was responsible for the significant precipitation hardening.

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25

Monzen, Ryoichi, and Takaharu Echigo. "Growth of BCC Fe-Co Particles Precipitated at Boundaries in Cu-Fe-Co Bicrystals." Journal of the Japan Institute of Metals 61, no. 11 (1997): 1206–10. http://dx.doi.org/10.2320/jinstmet1952.61.11_1206.

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26

LUCHES, P., A. DI BONA, A. BORGHI, C. GIOVANARDI, and S. VALERI. "GROWTH MODE OF ULTRATHIN Co FILMS ON Fe(001) PREPARED BY LOW ENERGY ION-ASSISTED DEPOSITION." Surface Review and Letters 06, no. 05 (October 1999): 747–52. http://dx.doi.org/10.1142/s0218625x99000743.

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Co films were epitaxially grown on Fe(001) by simultaneous thermal evaporation of Co atoms and ion bombardment with low-energy (300–1000 eV) Ar ions in a wide range of ion-to-atom flux ratio (0.02–0.5). The 0–50 ML coverage range was investigated. Transition from island growth to a continuous layer growth occurs on passing from purely thermal to ion-assisted deposition procedure. Structural characterization was performed by Primary-beam Diffraction Modulated Electron Emission (PDMEE). For purely thermal deposition, transition from the bcc phase to the equilibrium, hcp phase has been observed at a critical coverage of about 15 ML, both structures showing a significant strain (7% contraction and 5% expansion with respect to the ideal bcc and hcp phase, respectively). Ion assistance has proved to be effective in lowering both the strains in the Co film and the critical thickness of the bcc phase.

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27

Quealy-Gainer, Kate. "Teddy & Co. by Cynthia Voigt." Bulletin of the Center for Children's Books 70, no. 2 (2016): 100. http://dx.doi.org/10.1353/bcc.2016.0842.

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28

GAZZADI, G. C., A. DI BONA, F. BORGATTI, A. ROTA, and S. VALERI. "SURFACE AND NEAR SURFACE STRUCTURE OF Fe–Co LAYERS BY SCATTERING-INTERFERENCE OF PRIMARY ELECTRONS." Surface Review and Letters 04, no. 06 (December 1997): 1267–71. http://dx.doi.org/10.1142/s0218625x97001656.

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We studied the Co/Fe bi- and multilayer growth on Fe single crystal using the primary-beam diffraction modulated electron emission (PDMEE) technique. This approach enables a chemical selected structural characterization of both surface and buried layers and interfaces to be performed. Co growth on the Fe(001) surface was studied in the 3–70 ML coverage range. The transition from the initial epitaxial bcc phase of the Co film to the stable hcp phase was found to occur rather abruptly at 25–30 ML coverage, a value larger than previously reported in the literature. Subsequent Fe deposition on the Co hcp film recovers the bcc structure in the sandwiched Co layer. However, removal of the Fe epilayer by mild sputtering results again in an hcp Co film.

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29

Heiming, A., W. Petry, J. Trampenau, W. Miekeley, and J. Cockcroft. "The temperature dependence of the lattice parameters of pure BCC Zr and BCC Zr-2 at.%Co." Journal of Physics: Condensed Matter 4, no. 3 (January 20, 1992): 727–33. http://dx.doi.org/10.1088/0953-8984/4/3/012.

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30

Liu, B. X., and Z. J. Zhang. "Reverse martensitic phase transformation induced in Nb–Co multilayers by ion irradiation." Journal of Materials Research 9, no. 2 (February 1994): 357–61. http://dx.doi.org/10.1557/jmr.1994.0357.

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A reverse martensitic phase transformation was observed in Nb-enriched Nb-Co multilayers induced by room temperature 200 ke V xenon ion mixing. Further experiments revealed that this bcc-fcc transition proceeds in two steps, i.e., bcc-hcp and hcp-fcc. A crystallographic model is proposed to explain the two-step transition through shearing and sliding, which are mediated by irradiation-induced defects and strain in the films. In addition, the existence of the hcp and fcc metastable states in the Nb-Co system was confirmed by high-temperature solid state interdiffusion of the corresponding multilayers.

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31

Liu, Ning, Chen Chen, Isaac Chang, Pengjie Zhou, and Xiaojing Wang. "Compositional Dependence of Phase Selection in CoCrCu0.1FeMoNi-Based High-Entropy Alloys." Materials 11, no. 8 (July 25, 2018): 1290. http://dx.doi.org/10.3390/ma11081290.

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To study the effect of alloy composition on phase selection in the CoCrCu0.1FeMoNi high-entropy alloy (HEA), Mo was partially replaced by Co, Cr, Fe, and Ni. The microstructures and phase selection behaviors of the CoCrCu0.1FeMoNi HEA system were investigated. Dendritic, inter-dendritic, and eutectic microstructures were observed in the as-solidified HEAs. A simple face centered cubic (FCC) single-phase solid solution was obtained when the molar ratio of Fe, Co, and Ni was increased to 1.7 at the expense of Mo, indicating that Fe, Co, and Ni stabilized the FCC structure. The FCC structure was favored at the atomic radius ratio δ ≤ 2.8, valence electron concentration (VEC) ≥ 8.27, mixing entropy ΔS ≤ 13.037, local lattice distortion parameter α2 ≤ 0.0051, and ΔS/δ2 > 1.7. Mixed FCC + body centered cubic (BCC) structures occurred for 4.1 ≤ δ ≤ 4.3 and 7.71 ≤ VEC ≤ 7.86; FCC or/and BCC + intermetallic (IM) mixtures were favored at 2.8 ≤ δ ≤ 4.1 or δ > 4.3 and 7.39 < VEC ≤ 8.27. The IM phase is favored at electronegativity differences greater than 0.133. However, ΔS, α2, and ΔS/δ2 were inefficient in identifying the (FCC or/and BCC + IM)/(FCC + BCC) transition. Moreover, the mixing enthalpy cannot predict phase structures in this system.

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32

Montejano-Carrizales, J. M., and R. A. Guirado-López. "Magnetic Properties of Co Nanoparticles: Role of the Coexistence of Different Geometrical Phases." Journal of Nanoscience and Nanotechnology 8, no. 12 (December 1, 2008): 6497–503. http://dx.doi.org/10.1166/jnn.2008.18414.

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Following the experimental results of Respaud et al. [Phys. Rev. B 57, 2925 (1998)] we report self-consistent electronic structure calculations in order to analyze the magnetic properties of Co nanoparticles in which a coexistence of bcc and compact (fcc) phases are present within the particles. In all cases, the local spin moments S(i) are found to be saturated (∼1.7 μB) while, in contrast, the local orbital moments L(i) and the magnetic anisotropy energy (MAE) are found to be very sensitive to the size and structure of the systems. Interestingly, we obtain considerably enhanced values for L(i) at the internal bcc/fcc interfaces which can be even larger than at surfaces sites and, in addition, we found that by varying the fraction of bcc and fcc phases within the particles, several reorientations of the magnetization can be induced, a result that could open new possibilities to tune the MAE of magnetic nanoparticles.

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33

Mingjun, Li, Song Guangsheng, Yang Gencang, and Zhou Yaohe. "Critical undercoolings for the formation of metastable phase and its morphologies solidified from undercooled Fe–Co melts." Journal of Materials Research 14, no. 5 (May 1999): 1679–82. http://dx.doi.org/10.1557/jmr.1999.0225.

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The maximum undercoolings of 304, 318, 308, and 296 K were achieved, respectively, in Fe-22, 26, 30, and 34 at.% Co alloys. The metastable bcc phase nucleated from melts when undercoolings exceeded critical ones. The critical undercoolings for the formation of metastable bcc phase from Fe-22, 26, 30, and 34 at.% Co melts were 104, 156, 204, and 248 K, respectively. The morphologies of as-obtained metastable bcc phase exhibited five typical patterns: dendrite cores with primary and second arms, well-developed second arms, and radiated, lath, and platelike structures. Based on the classical nucleation theory, the solidification behavior of the melts was analyzed with regard to the metastable phase formation when the melts were undercooled greater than critical undercoolings. The formation of various morphologies was also evaluated to consider the solidification behavior of the undercooled melts.

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34

Yasuda, Hiroyuki Y., and Ryota Kobayashi. "Deformation Behavior of Fe-Al-Co-Ti Single Crystals Containing Co₂AlTi Precipitates." Materials Science Forum 879 (November 2016): 2210–15. http://dx.doi.org/10.4028/www.scientific.net/msf.879.2210.

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Deformation behavior of Fe-15Al-18Co-3Ti (at.%) single crystals containing the Co2AlTi precipitates was examined. In the single crystals furnace-cooled (FC) from 1373 K to room temperature, coarse Co2AlTi phase with the L21 structure was precipitated in the bcc matrix. The L21 phase showed a cuboidal shape with a misfit strain of 0.59%. It is also noted that large amount of Fe substituted for Co in the Co2AlTi precipitates. The FC single crystals exhibited high yield stress above 600 MPa up to 823 K while further increase in temperature resulted in a decrease in yield stress. In the FC crystals, 1/2<111> dislocations in the bcc matrix bypassed the coarse L21 precipitates due to their large misfit strain, resulting in high strength. In contrast, the fine L21 precipitates about 30 nm in diameter were observed in the crystals after solutionization and annealing at 823 K. The crystals with the fine L21 precipitates demonstrated high yield stress above 1400 MPa at room temperature. Paired 1/2<111> dislocations cut the fine L21 precipitates, which led to high strength. The dependence of the yield stress on the precipitate size was also discussed.

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35

Teodorescu, C. M., J. Chrost, H. Ascolani, J. Avila, F. Soria, and M. C. Asensio. "Growth of Epitaxial Co Layers on Sb-Passivated GaAs(110) Substrates." Surface Review and Letters 05, no. 01 (February 1998): 279–83. http://dx.doi.org/10.1142/s0218625x98000517.

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The role of Sb in the formation of the Co/GaAs(110) interfaces has been investigated by angular photoelectron diffraction (PD), synchrotron-radiation (SR) core-level photoemission and low-energy electron diffraction. We find that Co forms a metastable bcc phase on GaAs(110), with its principal crystallographic axes parallel to the substrate. From polar-angle-scanned PD, we determine an outward expansion of up to 14% of the lattice constant perpendicular to the surface, for epitaxial Co films grown on nontreated substrates. By Sb passivation of the GaAs(110) surface prior to the Co deposition, the epitaxial quality of the metallic overlayer is improved. The resulting Co phase is found to grow in a perfect bcc (110) orientation with a minor disruption of the substrate underneath and a reduced intralayer spacing outward expansion of less than 1%.

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Sowa, Erik C., and L. M. Falicov. "Many-body small-cluster theory of bcc Fe, Co, and the Fe-Co alloy." Physical Review B 37, no. 15 (May 15, 1988): 8707–12. http://dx.doi.org/10.1103/physrevb.37.8707.

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Sinclair, C. W., J. D. Embury, and G. C. Weatherly. "Basic aspects of the co-deformation of bcc/fcc materials." Materials Science and Engineering: A 272, no. 1 (November 1999): 90–98. http://dx.doi.org/10.1016/s0921-5093(99)00477-3.

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38

Björck, M., G. Andersson, B. Lindgren, R. Wäppling, V. Stanciu, and P. Nordblad. "Element-specific magnetic moment profile in BCC Fe/Co superlattices." Journal of Magnetism and Magnetic Materials 284 (December 2004): 273–80. http://dx.doi.org/10.1016/j.jmmm.2004.06.045.

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39

Spiridis, N., T. Ślęzak, M. Zajac, and J. Korecki. "Ultrathin epitaxial bcc-Co films stabilized on Au(001)-hex." Surface Science 566-568 (September 2004): 272–77. http://dx.doi.org/10.1016/j.susc.2004.05.056.

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40

Wu, Y. Z., H. F. Ding, C. Jing, D. Wu, G. L. Liu, V. Gordon, G. S. Dong, X. F. Jin, S. Zhu, and K. Sun. "In-plane magnetic anisotropy of bcc Co on GaAs(001)." Physical Review B 57, no. 19 (May 15, 1998): 11935–38. http://dx.doi.org/10.1103/physrevb.57.11935.

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41

Moruzzi, V. L., P. M. Marcus, K. Schwarz, and P. Mohn. "Ferromagnetic phases of bcc and fcc Fe, Co, and Ni." Physical Review B 34, no. 3 (August 1, 1986): 1784–91. http://dx.doi.org/10.1103/physrevb.34.1784.

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42

Scheurer, F., B. Carrière, J. P. Deville, and E. Beaurepaire. "Evidence of epitaxial growth of bcc Co on Cr(100)." Surface Science 245, no. 3 (April 1991): L175—L178. http://dx.doi.org/10.1016/0039-6028(91)90022-k.

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43

Scheurer, F., B. Carrière, J. P. Deville, and E. Beaurepaire. "Evidence of epitaxial growth of bcc Co on Cr(100)." Surface Science Letters 245, no. 3 (April 1991): L175—L178. http://dx.doi.org/10.1016/0167-2584(91)90764-i.

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44

Janotová, Irena, Peter Švec, Igor Mat’ko, Peter Švec, Dušan Janičkovič, and Juraj Zigo. "Structure of Rapidly Quenched Fe-Co-Sn-B Systems with Varying Fe/Co Ratio." Journal of Electrical Engineering 66, no. 5 (September 1, 2015): 297–300. http://dx.doi.org/10.2478/jee-2015-0049.

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Abstract We present a study of ferromagnetic systems based on Fe-Co-Sn-B in nanocrystalline state. Interesting magnetic properties potentially are given by the homogeneous and ultrafine structure of bcc Fe grains in amorphous structure. The effect of alloying by Sn improves the properties of resulting structure constituted be crystalline grains in amorphous matrix. The structure transformation from amorphous state was investigated by selected techniques of thermal analysis and the resulting phase and morphology of crystalline products were analyzed.

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45

Carrillo, Albert, Jason Daza, Joan Saurina, Lluisa Escoda, and Joan-Josep Suñol. "Structural, Thermal and Magnetic Analysis of Fe75Co10Nb6B9 and Fe65Co20Nb6B9 Nanostructured Alloys." Materials 14, no. 16 (August 12, 2021): 4542. http://dx.doi.org/10.3390/ma14164542.

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Two nanocrystalline ferromagnetic alloys of the Fe-Co-Nb-B system have been produced by mechanical alloying (MA). Their microstructure, thermal behavior and magnetic response were checked by X-ray diffraction (XRD), differential scanning calorimetry (DSC) and vibrating sample magnetometry (VSM). After 80 h of MA, the alloys were nanostructured (bcc-Fe(Co)-rich phase). As the Co content increases, the density of the dislocations decreases. Besides, a higher concentration of Co causes an increase in the activation energy of the crystallization process. The calculated energies, 267 and 332 kJ/mol, are associated to the crystalline growth of the bcc-Fe-rich phase. The Co content of the samples has no effect on the value of the saturation magnetization, whereas the coercivity is lower in the alloy containing less Co. Samples were compacted and heat-treated. Optimal annealing reduces the coercivity by a factor of two. Results were compared with the data of Fe-Nb-B and Fe-Ni-Nb-B alloys.

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46

Hartley-Kroeger, Fiona. "Pages & Co.: The Bookwanderers by Anna James." Bulletin of the Center for Children's Books 73, no. 1 (2019): 21. http://dx.doi.org/10.1353/bcc.2019.0575.

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47

Zhang, Zequn, Kaikai Song, Ran Li, Qisen Xue, Shuang Wu, Delong Yan, Xuelian Li, et al. "Polymorphic Transformation and Magnetic Properties of Rapidly Solidified Fe26.7Co26.7Ni26.7Si8.9B11.0 High-Entropy Alloys." Materials 12, no. 4 (February 15, 2019): 590. http://dx.doi.org/10.3390/ma12040590.

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In this work, the microstructural evolution and magnetic performance of the melt-spun amorphous and amorphous-crystalline Fe26.7Co26.7Ni26.7Si8.9B11.0 high-entropy alloys (HEAs) during crystallization were investigated, respectively. Upon heating fully amorphous ribbons, a metastable BCC supersaturated solid solution together with a little Ni31Si12 crystals first precipitated and then the (Fe,Co)2B crystals formed until the full crystallization was achieved. With further increasing temperature after full crystallization, a polymorphic transformation from a metastable BCC phase to two types of FCC solid solutions occurred. For the amorphous-crystalline HEAs, the dominant crystallization products were the metastable FCC but not BCC crystals. During crystallization, the primary metastable FCC crystals first transform into the metastable BCC crystals and then the newly-generated BCC phase transforms into two types of FCC phases with further increasing temperature. This temperature dependence of the gradual polymorphic transformation results in the change of magnetic properties of the present high-entropy amorphous alloys.

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Deng, Wen, Li Xia Li, Shou Lei Xu, Wen Chun Zhang, Yu Yang Huang, and Ding Kang Xiong. "Studies of Microdefects, Thermal Expansion and Magnetic Properties of Fe-Ni-Co Invar Alloys." Defect and Diffusion Forum 373 (March 2017): 146–49. http://dx.doi.org/10.4028/www.scientific.net/ddf.373.146.

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The microdefects, the thermal expansion coefficients and the magnetization -temperature curves of the Fe64Ni36-xCox (x=1~10) were characterized by means of positron lifetime, X-ray diffraction, Michelson's interferometer and VSM modular on PPMS, respectively. The Fe64Ni30Co6 alloy is a mixture of BCC and FCC structures. With the Co content increasing in Fe64Ni36-xCox alloys, the BCC phase increases, while the FCC phase decreases. In comparison with other Fe64Ni36-xCox alloys, the Fe64Ni31Co5 alloy has a rather high magnetization at temperature lower than Tc, a relatively large change of the magnetization with the temperature near Tc, and a rather low thermal expansion coefficient.

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Kamiya, N., T. Sakai, R. Kainuma, I. Ohnuma, and K. Ishida. "Phase separation of BCC phase in the Co-rich portion of Co-Fe-Al system." Intermetallics 12, no. 4 (April 2004): 417–23. http://dx.doi.org/10.1016/j.intermet.2003.12.005.

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Jay, J. P., E. Jêdryka, M. Wójcik, J. Dekoster, G. Langouche, and P. Panissod. "On the stability of bcc Co in Co/Fe superlattices an NMR and XRD study." Zeitschrift für Physik B Condensed Matter 101, no. 3 (December 1997): 329–37. http://dx.doi.org/10.1007/s002570050216.

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