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11. MAGNETIC PROPERTIES OF SOME Er2Fe14BHX HYDRIDES

Author

BEZDUSHNYI, R., DAMIANOVA, R., TERESHINA, I.S., BURKHANOV, G.S., CHISTYAKOV, O.D., NIKITIN, S.A., TERESHINA, E.A., Veziroglu, T. Nejat, editor, Zaginaichenko, Svetlana Yu., editor, Schur, Dmitry V., editor, Baranowski, Bogdan, editor, Shpak, Anatoliy P., editor, Skorokhod, Valeriy V., editor, and Kale, Ayfer, editor

Published
2007
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19. Magnetic properties of Zr-doped [Lu.sub.2][Fe.sub.17] single crystal and its hydride

Author

Tereshina, E.A., Andreev, A.V., Drulis, H., and Danis, S.

Subjects
Anisotropy -- Analysis, Ferromagnetism -- Analysis, Business, Electronics, Electronics and electrical industries
Abstract

Influence of Zr-substitution on magnetic properties of [([Lu.sub.1 - x][Zr.sub.x]).sub.2][Fe.sub.17] single crystals was investigated. The homogeneity range of [([Lu.sub.1 - x][Zr.sub.x]).sub.2][Fe.sub.17] compounds extends from x = 0 to 0.2, since the compound with a higher Zr content, x = 0.4, was found to be multiphase. In [([Lu.sub.0.8][Zr.sub.0.2]).sub.2][Fe.sub.17], antiferromagnetism present in [Lu.sub.2][Fe.sub.17] compound is totally suppressed upon Zr substitution and ferromagnetism is stabilized in the whole range of magnetic ordering with a considerable increase of magnetic ordering temperature from 274 K in [Lu.sub.2][Fe.sub.17] to 325 K in [([Lu.sub.0.8][Zr.sub.0.2]).sub.2][Fe.sub.17. Successful hydrogenation without estroying the single-crystalline structure of [([Lu.sub.0.8][Zr.sub.0.2]).sub.2][Fe.sub.17] compound was performed, and [([Lu.sub.0.8][Zr.sub.0.2]).sub.2][Fe.sub.17][H.sub.0.48] hydride was obtained. Hydrogenation of [([Lu.sub.0.8][Zr.sub.0.2]).sub.2][Fe.sub.17] resulted in increase of [T.sub.C] from 325 K to 365 K. [([Lu.sub.0.8][Zr.sub.0.2]).sub.2][Fe.sub.17][H.sub.y] (y = 0, 0.48) compounds have an easy-plane type of magnetic anisotropy and possess magnetic moments of 35 [[micro].sub.B]/f.u. in the ground state. Influence of Zr doping and effect of subsequent hydrogenation of the [([Lu.sub.0.8][Zr.sub.0.2]).sub.2][Fe.sub.17] compound on magnetocrystalline anisotropy of [Lu.sub.2][Fe.sub.17] compound was found to be rather weak. Index Terms--Hydrides, intermetallic compounds, substitutions.

Published
2008

26. Antiferromagnetic order in [([Lu.sub.0.8][Ce.sub.0.2]).sub.2][Fe.sub.17] and [Lu.sub.2][Fe.sub.16.5][Ru.sub.0.5]: high pressure study

Author

Tereshina, E.A., Andreev, A.V., Kamarad, J., and Isnard, O.

Subjects
Antiferromagnetism -- Analysis, Ruthenium -- Thermal properties, Ruthenium -- Magnetic properties, Materials at high pressures -- Analysis, Iron alloys -- Thermal properties, Iron alloys -- Magnetic properties, Cerium -- Magnetic properties, Cerium -- Thermal properties, Physics
Abstract

The antiferromagnetic state seen in [Lu.sub.2][Fe.sub.17] at elevated temperatures is stabilized down to the ground state in [([Lu.sub.0.8][Ce.sub.0.2]).sub.2][Fe.sub.17] and [Lu.sub.2][Fe.sub.16.5][Ru.sub.0.5]. The pressure and substitution effects are understood in terms of exchange interaction varying with changes in the lattice parameter c for [([Lu.sub.0.8][Ce.sub.0.2]).sub.2][Fe.sub.17], while for [Lu.sub.2][Fe.sub.16.5][Ru.sub.0.5], the change in magnetic structure has occurred due to the weakening of the positive exchange interaction as a result of the reduction in the Fe magnetic moments.

Published
2009

33. The effect of hydrogen on the magnetostriction of rare-earth compounds TbxDy₁₋xFe₂

Author

Nikitin, S.A., Tereshina, I.S., Touliakov, A.P., Tereshina, E.A., Verbetsky, V.N., and Salamova, A.A.

Subjects
Condensed Matter::Materials Science, Низкотемпеpатуpная магнитостpикция магнетиков и свеpхпpоводников, Astrophysics::Galaxy Astrophysics
Abstract

The crystal structure and the magnetic and magnetoelastic properties of TbxDy₁₋xFe₂Hy (x = 0.27; 0.41; y ≤ 3) are investigated. The hydrides are obtained by the interaction of TbxDy₁₋xFe₂ samples with hydrogen gas at room temperature. It is established that the hydrides have the same cubic type of structure as the parent compounds but the lattice parameter in the hydrides is larger than in the hydrogen-free samples. Both the Curie temperature and the magnetic moment decrease drastically as the hydrogen concentration increases. Measurements of the longitudinal λ|| and transverse magnetostriction λ^ are carried out in magnetic fields up to 12 kOe in the temperature range 78√300 K using strain gauges.The thermal expansion coefficients as a function of temperature are obtained for hydrides with high hydrogen concentration. The magnetostriction of hydrides is strongly different from that of hydride-free samples. The small and negative value of the magnetostriction at low temperatures proves that hydrogen atoms make a strong contribution to the crystal field acting on the rare-earth ions.

Published
2001

50. CHANGE OF CURIE TEMPERATURE AND EFFECTIVE EXCHANGE FIELDS IN FERRIMAGNETIC R2Fe14B COMPOUNDS UPON HYDROGENATION.

Author

Veziroglu, T. Nejat, Zaginaichenko, Svetlana Yu., Schur, Dmitry V., Baranowski, Bogdan, Shpak, Anatoliy P., Skorokhod, Valeriy V., Kale, Ayfer, TERESHINA, I.S., CHISTYAKOV, O.D., BURKHANOV, G.S., TERESHINA, E.A., NIKITIN, S.A., FOLCIK, L., and DRULIS, H.

Abstract

The magnetic properties (magnetic ordering temperature and magnetization) of the ferrimagnetic compounds R2Fe14B (R = Gd, Tb, Dy, Ho and Er) and their hydrides R2Fe14BH2.5 were studied. It was found that incorporation of hydrogen into the crystal lattice of R2Fe14B compounds substantially increases the Curie temperature and Fe-Fe exchange interactions. Hydrogenation does not practically change the intersublattice exchange field h21 and exchange field h22 within the R - sublattice. This effect can be understood as a result of the attendant changes in the unit cell volume and an electronic structure of these compounds. [ABSTRACT FROM AUTHOR]

Published
2007
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