Effect of zirconium upon structure and magnetic properties of 2-17 type rare earth-cobalt magnets

Fukui, Yoshimasa; Nishio, Takayuki; Iwama, Yoshiro

doi:10.1109/tmag.1987.1065601

Cited by 17 publications

(6 citation statements)

References 5 publications

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“…3 It is well known that the 1:7 phase plays an important role in developing the cellular structure and hightemperature properties in high-temperature magnets. 5,6 The formation of single 1:7 phase for PrCo 6.7Ϫx Cu x Ti 0.3 (x Ͼ0.4) samples indicates that these samples have potential application in high-temperature magnets.…”

Section: Resultsmentioning

confidence: 98%

“…It is well known that the 1:7 phase with TbCu 7 -type structure plays an important role in developing the cellular structure, bulk hardening and high-temperature properties in high-temperature magnets. [5][6][7][8][9] RCo 7 phase is unstable unless a third doping element is added to substitute for Co. It has been known that Zr and Ti can stabilize the SmCo 7 phase 1,3 and Zr can also stabilize the PrCo 7 phase.…”

Section: Introductionmentioning

confidence: 99%

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Structure and magnetic properties of PrCo6.7−xCuxTi0.3 compounds

Zhang

Wang

Rong

et al. 2003

Journal of Applied Physics

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The phase structure and magnetic properties of PrCo6.7−xCuxTi0.3 (x=0–1) compounds have been studied. The compounds were prepared by arc melting and subsequent annealing. With an increase of Cu content, the 2:17 phase disappears and the single 1:7 phase with TbCu7-type structure is formed for samples x>0.4. Tc2:17 and Tc1:7 in samples x=0–0.4 decrease with an increase of Cu content. Tc1:7 in samples x>0.4, however, is almost the same. For samples x>0.4, the study of their anisotropy indicates that these samples have uniaxial anisotropy at 293 K. The addition of Cu weakens the anisotropy of the Co sublattice and enhances the anisotropy of the Pr sublattice, which causes the spin reorientation temperature to increase.

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Section: Resultsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Structure and magnetic properties of PrCo6.7−xCuxTi0.3 compounds

Zhang

Wang

Rong

et al. 2003

Journal of Applied Physics

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“…So far, very rare investigations have been performed on melt-spun ribbons of this alloy system: Fukui et al 13 examined the effect of Zr and obtained the cellular microstructure by a clearly distinct annealing procedure. Furthermore, nanocrystalline exchange coupled ribbons partly with C and B additions, produced by a short term annealing of only 5 min at 800°C have been characterized in Ref.…”

Section: And H Kronmü Llermentioning

confidence: 99%

Melt-spun precipitation-hardened Sm2(Co, Cu, Fe, Zr)17 magnets with abnormal temperature dependence of coercivity

Goll¹,

Kleinschroth²,

Sigle³

et al. 2000

Applied Physics Letters

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Rapidly quenched Sm(CobalCu0.08Fe0.22Zr0.02)8.5 (Cu-/Fe-rich) and Sm(CobalCu0.05Fe0.10Zr0.03)8.5 (Cu-/Fe-poor) ribbons have been prepared by means of the melt-spinning technique. By applying an appropriate annealing procedure a microstructure similar to that of sintered magnets can be obtained. The energy dispersive x-ray microanalysis of the compositional dependence near the cell boundaries suggests a model for the profile of the crystal anisotropy constants responsible for the magnetic hardening. The Cu-/Fe-rich alloy shows a normal temperature dependence of coercivity with a negative temperature coefficient, but the Cu-/Fe-poor ribbons show a positive temperature coefficient in the temperature range from 400–700 K. The different temperature coefficients are discussed in terms of a pinning model.

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“…In these alloys, it is well known, e.g., by transmission electron microscopy xray microanalysis (27,11,12) that Cu segregates to the 1:5 cell walls and that Fe segregates to the 2:17 phase cell interiors. Zr is concentrated in the platelets and, to a lesser extent, in the 2:17 phase.…”

Section: Microstructuresmentioning

confidence: 99%