Mössbauer Study of Hyperfine Fields and Isomer Shifts in the Fe-Rh Alloys

G. Shirane; C. W. Chen; P. A. Flinn; R. Nathans

doi:10.1103/PhysRev.131.183

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Mössbauer Study of Hyperfine Fields and Isomer Shifts in the Fe-Rh Alloys

G. Shirane^*, C. W. Chen, and P. A. Flinn

R. Nathans

Westinghouse Research Laboratories, Pittsburgh, Pennsylvania

Brookhaven National Laboratory, Upton, New York

^*Present address: Brookhaven National Laboratory, Upton, New York.

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Phys. Rev. 131, 183 – Published 1 July, 1963

DOI: https://doi.org/10.1103/PhysRev.131.183

Abstract

Hyperfine fields and isomer shifts of ${Fe}^{57}$ in the Fe-Rh system have been investigated by the Mössbauer technique in the composition range between 0 and 52 at.% Rh. When the Rh concentration exceeds 20%, chemical ordering of CsCl type develops and two distinct hyperfine fields are observed, corresponding to Fe on Fe sites (FeI) and Fe on Rh sites (FeII). For example, $H_{i} (I) = 277$ kOe and $H_{i} (II) = 384$ kOe in an alloy containing 48% Rh. Neutron diffraction study of this alloy gave $μ_{FeI} = 3.2$ $μ_{B}$ , but no direct measurement is available for $μ_{FeII}$ . It is suggested that FeII, which is surrounded by 8 Fe nearest neighbors, may have a smaller magnetic moment than FeI despite its higher hyperfine field. The alloy with 50% Rh transforms, on cooling, from ferromagnetic to antiferromagnetic at 65°C. At this phase transition the hyperfine field shows a discontinuous decrease of 14 kOe.

References (19)

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[c1] M. Fallot, Ann. Phys. (Paris) 10, 291 (1938)

[c2] M. Fallot and R. Hocart, Rev. Sci. 77, 498 (1939)

[c3] F. de Bergevin and L. Muldawer, Compt. Rend. 252, 1347 (1961)

[c4] L. Muldawer and F. de Bergevin, J. Chem. Phys. 35, 1905 (1961)

[c5] J. S. Kouvel and C. C. Hartelius, Suppl. J. Appl. Phys. 33, 1343 (1962)

[c6] L. R. Walker, G. K. Wertheim, and V. Jaccarino, Phys. Rev. Letters 6, 98 (1961)

[c7] C. E. Johnson, M. S. Ridout, T. E. Cranshaw, and P. E. Madsen, Phys. Rev. Letters 6, 450 (1961)

[c8] C. E. Johnston, M. S. Ridout, and T. E. Cranshaw, in Proceedings of the International Conference on Mössbauer Effect, Paris, 1961 (John Wiley & Sons, Inc., New York, 1962), p. 142

[c9] P. A. Flinn and S. L. Ruby, Phys. Rev. 124, 34 (1961)

[c10] E. A. Friedman and W. J. Nicholson, Suppl. J. Appl. Phys. 33, 1048 (1963)

[c11] E. F. Bertaut, A. Delapalme, F. Fowat, G. Roult, F. de Bergevin, and R. Pauthenet, Suppl. J. Appl. Phys. 33, 1123 (1962)

[c12] G. Shirane, C. W. Chen, P. A. Flinn, and R. Nathans, Suppl. J. Appl. Phys. 33, 1044 (1963)

[c13] M. Hansen, Constitution of Binary Alloys (McGraw-Hall Book Company, Inc., New York, 1958), p. 703

[c14] P. A. Flinn (to be published)

[c15] S. S. Hanna, J. Heberle, C. Littlejohn, G. J. Perlow, R. S. Preston, and D. H. Vincent, Phys. Rev. Letters 4, 177 (1960)

[c16] R. S. Preston, S. S. Hanna, and J. Heberle, Phys. Rev. 128, 2207 (1962)

[c17] M. B. Stearns, Phys. Rev. 129, 1136 (1963)

[c18] P. A. Flinn (to be published)

[c19] C. G. Shull and M. K. Wilkinson, Phys. Rev. 97, 304 (1955)

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Mössbauer Study of Hyperfine Fields and Isomer Shifts in the Fe-Rh Alloys

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