Structural and magnetic characterization of zircon-type PrCrO4 oxide

JOURNAL OF ALLOYS AND COMPOUNDS

卷:323

Article; Proceedings Paper

Jiménez, E ; Isasi, J ; Sáez-Puche, R

关键词: magnetically ordered materials;    chemical synthesis;    X-ray diffraction;    exchange and superexchange;    magnetic measurements;   

DOI  :  10.1016/S0925-8388(01)00978-1

来源: Elsevier

【 摘 要 】

PrCrO4 has been synthesized as a single phase using oxidizing conditions, with a strong control on temperature and time. The zircon-type structure that this compound adopts has been refined from X-ray powder diffraction by the Rietveld method, showing tetragonal symmetry with space group 14(1)/amd, lattice parameters a = 7.341(7) Angstrom, c = 6.427(1) Angstrom and Z = 4. Magnetic susceptibility measurements in the temperature range of 1.9-300 K reveal the presence of incipient ferromagnetic interactions in the Cr5+ sublattice below 12 K. When the temperature decreases, the superexchange Pr3+-O-Cr5+-O-Pr3+ antiferromagnetic interactions become predominant, giving rise to a net maximum at lower temperatures. The estimated Neel temperature is field-dependent, taking the value of 9 K when the magnetic field strength is 50 Oe. The M vs. H plots, at 2 and 8 K, indicate the existence of a metamagnetic transition, having obtained a critical field as low as 399 and 149 Oe respectively at the temperatures mentioned above. (C) 2001 Elsevier Science B.V. All rights reserved.

【 授权许可】

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