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High-Pressure and High-Temperature Synthesis of a Novel Perovskite Compound: Magnetic and Electric Properties of the Rhodium Oxide SrRhO3

Published online by Cambridge University Press:  01 February 2011

K. Yamaura
Affiliation:
Superconducting Materials Center, National Institute for Materials Science, Tsukuba, Ibaraki 305-0044, Japan.
D.P. Young
Affiliation:
Department of Physics and Astronomy, Louisiana State University, Baton Rouge, LA 70803, U.S.A.
E. Takayama-Muromachi
Affiliation:
Superconducting Materials Center, National Institute for Materials Science, Tsukuba, Ibaraki 305-0044, Japan.
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Abstract

Novel perovskite compound SrRhO3 was synthesized in a polycrystalline form by high-pressure technique at 6 GPa and 1500°C, followed by measurements of magnetic susceptibility, electrical resistivity, thermopower, and specific heat. Powder x-ray diffraction study found the slightly distorted perovskite structure, GdFeO3-type, to be likely to SrRhO3; space group was Pnma and lattice parameters were α = 5.5394(2) Å, b = 7.8539 (3) Å, and c = 5.5666(2) A. Oxygen vacancies in the perovskite were quantitatively investigated by thermogravimetric analysis and then found either absent or at least insignificant. The title compound shows a Fermi-liquid behavior in its electrical resistivity. The magnetic susceptibility is large [χ(300) ∼1.1x10-3 emu/mol-Rh], and the characteristics seem to be intermediate between enhanced Pauli- and Curie-Weiss-type paramagnetism.

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Type
Research Article
Copyright
Copyright © Materials Research Society 2002

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