Structures of Zr2Co11 and HfCo7 intermetallic compounds

Demczyk, B. G.; Cheng, Zhangyu

doi:10.1107/s0021889891007331

Cited by 52 publications

(33 citation statements)

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“…An intermetallic compound with a stoichiometry of HfCo 7 is reported to form one of the following structures: tetragonal, hexagonal or orthorhombic for x ¼ 12.5 at%. 20,[23][24][25] Interestingly, XRD peaks of Co(Hf) nanoparticles with x ¼ 14.1 at% (curve ii in Fig. 2(a)) are in agreement with the diffraction peaks corresponding to the orthorhombic structure of melt-spun HfCo 7 bulk alloys (vertical-solid lines in Fig.…”

supporting

confidence: 63%

Magnetism of dilute Co(Hf) and Co(Pt) nanoclusters

Balamurugan

Skomski

Das

et al. 2012

Journal of Applied Physics

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An investigation of the magnetic properties of Co-rich nanoparticles alloyed with a small fraction of Pt and Hf is presented. Co(Hf) and Co(Pt) nanoparticles with less than 15 at% of dopants were produced using a cluster-deposition method. The nanoparticles have sizes of less than 10 nm and show improved magnetic properties upon doping. Maximum coercivities of 900 Oe (at 300 K) and 2000 Oe (at 10 K) were observed for Co nanoparticles alloyed with 14.1 at% of Hf. Doped nanoparticles also exhibit high anisotropies, such as K1 = 9.98 Mergs/cm3 (14.1 at% of Hf) and K1 = 8.24 Mergs/cm3 (9.5 at% of Pt), as compared to Co nanoparticles (K1 = 6.21 Mergs/cm3).

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supporting

confidence: 63%

Magnetism of dilute Co(Hf) and Co(Pt) nanoclusters

Balamurugan

Skomski

Das

et al. 2012

Journal of Applied Physics

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“…[5,6] Figure 2(e) was indexed according to the lattice parameters reported by Demczyk and Cheng. [6] Figure 2 Note: HT is high temperature, LT is low temperature.…”

Section: Resultsmentioning

confidence: 99%

“…[3] Depending on the preparation process, the crystal structure of Zr2Co11 may be pseudohexagonal, rhombohedral, or orthorhombic. [4][5][6] Until now, the structure that leads to hard magnetism is under dispute. Recently, most work was focused on optimizing nanostructure and improving the magnetic properties of Zr2Co11-based alloys.…”

Section: Introductionmentioning

confidence: 99%

Magnetism of rapidly quenched rhombohedral Zr₂Co₁₁-based nanocomposites

Zhang¹,

Li²,

Valloppilly³

et al. 2013

J. Phys. D: Appl. Phys.

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The effect of quench rate and Zr content on nanostructure and magnetic properties of melt-spun ZrxCo100−x (x = 16-21) is investigated. High quench rate favors the formation of rhombohedral Zr2Co11, which is the hard phase. The coercivity increases with an increase in quench rate. Zr addition in limited amounts decreases the grain size of magnetic phases, which may promote the effective exchange coupling of soft magnetic phases. Therefore, coercivity and maximum energy product of Zr2Co11-based materials are significantly enhanced. The best magnetic properties, iHc = 3.0 kOe and (BH)max = 4.6 MG Oe, which are the highest reported values among Co-Zr binary alloys, are achieved for x = 18. The temperature coefficients of coercivity and remanence between 100 and 380 K are −0.05% K −1 , comparable to those of alnico magnet.

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“…[1][2][3] Depending on the preparation process, the crystal structure of Zr 2 Co 11 may be rhombohedral or orthorhombic. [4][5][6] Among these phases, rhombohedral Zr 2 Co 11 has been demonstrated to be the hard magnetic phase, 7 and a high quenching rate favors the formation of the hard magnetic phase. 8 Recently, an impressive energy product comparable to that of sintered SmCo 5 was obtained for the easy-axis aligned Zr 2 Co 11 -based nanocomposites produced by a single step cluster-deposition method.…”

Section: Introductionmentioning

confidence: 99%

Phase composition and nanostructure of Zr2Co11-based alloys

Jin

Zhang

Skomski

et al. 2014

Journal of Applied Physics

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The effect of Mo addition on phase composition and nanostructure of nanocrystalline Zr16Co84−xMox (x = 0–2.0) melt spun at 55 m/s has been investigated. All the ribbons consist mainly of a hard magnetic Zr2Co11 phase with rhombohedral crystal structure but also contain minor amounts of soft-magnetic phases. The increase in cell volume on alloying suggests that Mo mainly enters the rhombohedral Zr2Co11 structure and occupies the Co site. Mo addition promotes the formation of the hard magnetic phase and increases its volume fraction. The mean grain size of the hard magnetic phase remains almost unchanged with the increase of Mo content. But the average grain size of the soft magnetic phase decreases from about 200 nm to 50 nm. This promotes the exchange coupling of the hard and soft magnetic phases and thus leads to a significant increase in coercivity and isotropic energy product, from 0.6 kOe and 0.5 MGOe for x = 0 to 2.9 kOe and 4.2 MGOe for x = 1.5.

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Structures of Zr₂Co₁₁ and HfCo₇ intermetallic compounds

Cited by 52 publications

References 5 publications

Magnetism of dilute Co(Hf) and Co(Pt) nanoclusters

Magnetism of dilute Co(Hf) and Co(Pt) nanoclusters

Magnetism of rapidly quenched rhombohedral Zr₂Co₁₁-based nanocomposites

Phase composition and nanostructure of Zr2Co11-based alloys

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Structures of Zr2Co11 and HfCo7 intermetallic compounds

Cited by 52 publications

References 5 publications

Magnetism of dilute Co(Hf) and Co(Pt) nanoclusters

Magnetism of dilute Co(Hf) and Co(Pt) nanoclusters

Magnetism of rapidly quenched rhombohedral Zr2Co11-based nanocomposites

Phase composition and nanostructure of Zr2Co11-based alloys

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Structures of Zr₂Co₁₁ and HfCo₇ intermetallic compounds

Magnetism of rapidly quenched rhombohedral Zr₂Co₁₁-based nanocomposites