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Magnetic Susceptibilities and Mössbauer Spectra of Perovskites A2FeNbO6 (A=Sr, Ba)

✍ Scribed by Keitaro Tezuka; Kou Henmi; Yukio Hinatsu; Nobuyuki M. Masaki

Publisher
Elsevier Science
Year
2000
Tongue
English
Weight
161 KB
Volume
154
Category
Article
ISSN
0022-4596

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✦ Synopsis

Perovskite-type compounds A 2 FeNbO 6 (A ‫؍‬ Sr, Ba) were prepared. Their powder X-ray di4raction measurements and the Rietveld analysis show that the cations Fe 3؉ and Nb 5؉ over the six-coordinate sites of the perovskite structure are arranged randomly for Sr 2 FeNbO 6 and some of them order regularly for Ba 2 FeNbO 6 . They show magnetic susceptibility maxima at ca. 25 K. Below the temperatures, the divergence of the magnetic susceptibilities measured between the zero-5eld-cooled condition and the 5eld-cooled condition has been measured. Field-cooled and zero-5eld-cooled susceptibilities show a hysteresis below maximum temperatures. These results indicate the existence of a ferromagnetic component in the magnetic moment. MoK ssbauer spectra measured at 6 K comprise a single magnetic hyper5ne pattern typical of Fe 3؉ , but with a high degree of line broadening. These data are discussed in terms of antiferromagnetic interactions with a ferromagnetic component. 2000

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