Magnetic characteristics of RCo2−xFex hydrides (R ≡ Tb,Dy)

作者: F. Pourarian , W.E. Wallace , S.K. Malik

DOI: 10.1016/0022-5088(82)90173-4

关键词: CobaltCurie temperatureMagnetic momentHydrogenLaves phaseFormula unitMagnetizationMoment (physics)Condensed matter physicsChemistry

摘要: Abstract The Laves phase compounds RCo2−xFex (R ≡ Tb, Dy and x = 0, 0.6 2) are found to absorb about 3–3.5 hydrogen atoms per formula unit. absorption results in a large increase cell volume (about 20%–25%) without change the structure. Detailed magnetization studies on parent hydrides have been carried out temperature interval 4.2–300 K. From these measurements it is inferred that leads reduction cobalt magnetic moment TbCo2 DyCo2 but an iron TbFe2 DyFe2 as well cobalt-rich ternaries TbCo1.4Fe0.6 DyCo1.4Fe0.6. Magnetization of all at 4.2 K shows no tendency saturate even fields up 20 kOe. This suggests possible fanning rare earth moments due weakening RCo RFe exchange. A from first-order transition Curie second order, hydrogenation, observed.

参考文章(13)
E.B. Boltich, F. Pourarian, W.E. Wallace, H.K. Smith, S.K. Malik, Influence of hydrogen on structure and magnetic properties of Ho6Fe23 and Er6Fe23 Solid State Communications. ,vol. 40, pp. 117- 120 ,(1981) , 10.1016/0038-1098(81)90149-6
R. M. Moon, W. C. Koehler, John Farrell, Magnetic Structure of Rare‐Earth‐Cobalt (RCo2) Intermetallic Compounds Journal of Applied Physics. ,vol. 36, pp. 978- 979 ,(1965) , 10.1063/1.1714286
S.K. Malik, W.E. Wallace, T. Takeshita, Hydrogen induced change from superconducting to magnetically ordered state in Th7Fe3 Solid State Communications. ,vol. 28, pp. 359- 360 ,(1978) , 10.1016/0038-1098(78)90411-8
F Pourarian, W.E Wallace, A Elattar, John F Lakner, DyFe2-H2 system: Magnetism and pressure-composition isotherms to 1400 atm Journal of The Less Common Metals. ,vol. 74, pp. 161- 165 ,(1980) , 10.1016/0022-5088(80)90086-7
John Farrell, W. E. Wallace, Magnetic Properties of Intermetallic Compounds between the Lanthanides and Nickel or Cobalt Inorganic Chemistry. ,vol. 5, pp. 105- 109 ,(1966) , 10.1021/IC50035A025
S.K. Malik, E.B. Boltich, W.E. Wallace, Effect of absorbed hydrogen on magnetic behavior of Th7Co3 and Th7Ni3 Solid State Communications. ,vol. 33, pp. 921- 923 ,(1980) , 10.1016/0038-1098(80)90281-1
P. J. Viccaro, J. M. Friedt, D. Niarchos, B. D. Dunlap, G. K. Shenoy, A. T. Aldred, D. G. Westlake, Magnetic properties of DyFe2H2 from 57Fe, 161Dy Mössbauer effect and magnetization measurements Journal of Applied Physics. ,vol. 50, pp. 2051- 2052 ,(1979) , 10.1063/1.327105
G. E. Fish, J. J. Rhyne, S. G. Sankar, W. E. Wallace, Effect of hydrogen on sublattice magnetization of Laves‐phase rare earth iron compounds Journal of Applied Physics. ,vol. 50, pp. 2003- 2005 ,(1979) , 10.1063/1.327139
S.K. Malik, T. Takeshita, W.E. Wallace, Hydrogen induced magnetic ordering in Th6Mn23 Solid State Communications. ,vol. 23, pp. 599- 602 ,(1977) , 10.1016/0038-1098(77)90528-2
D. M. Gualtieri, K. S. V. L. Narasimhan, T. Takeshita, Control of the hydrogen absorption and desorption of rare‐earth intermetallic compounds Journal of Applied Physics. ,vol. 47, pp. 3432- 3435 ,(1976) , 10.1063/1.323179