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Magnetic Susceptibilities and Mössbauer Spectra of Sr2−xLaxFeO4−δ (0≤x≤0.5)

✍ Scribed by Yukio Hinatsu; Keitaro Tezuka; Masaaki Inamura; Nobuyuki M. Masaki

Publisher: Elsevier Science
Year: 1999
Tongue: English
Weight: 133 KB
Volume: 146
Category: Article
ISSN: 0022-4596
DOI: 10.1006/jssc.1999.8346

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✦ Synopsis

Solid solutions Sr 2 ؊ x La x FeO 4 ؊ (04x40.5) with the K 2 NiF 4 -type structure have been prepared, and their magnetic susceptibilities have been measured in the temperature range between 4.2 and 300 K. Substitution of the La ion for the Sr site considerably weakens the antiferromagnetic transition of Sr 2 FeO 4 , and it 5nally disappears in Sr 1.6 La 0.4 FeO 4 ؊ . Below the magnetic transition temperatures, magnetic susceptibilities measured under zero-5eld cooled and 5eld cooled conditions indicate the formation of a spin-glass state. Mo] ssbauer spectra for Sr 1.9 La 0.1 FeO 4 ؊ at room temperature and at 9 K have been measured, and the spectra at 9 K show the presence of magnetic hyper5ne interaction of Fe 4 ؉ ions; there is no charge disproportionation of Fe 4 ؉ PFe 3 ؉ ؉ Fe 5 ؉ , even below the magnetic transition temperature.

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