Magnetic and Mössbauer Studies of the Ordered Perovskites Sr2Fe1+xRe1-xO6

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Abstract
Structural, magnetic, electrical properties and Mössbauer effect are investigated on Sr 2 FeReO 6 , SrFe 2/3 Re 1/3 O 3 and their solid solutions. Sr 2 FeReO 6 and SrFe 2/3 Re 1/3 O 3 (Sr 2 Fe 4/3 Re 2/3 O 6 ) are ordered perovskites of types Sr 2 [Fe][Re]O 6 and Sr[Fe][Fe 1/3 Re 2/3 ]O 6 respectively, both of which are tetragonal at room temperature. Sr 2 FeReO 6 is metallic (ρ∼10 -3 \(\varOmega\)-cm) and ferrimagnetic below 419 K, while SrFe 2/3 Re 1/3 O 3 is semiconductive (ρ r · t · ∼10 -1 \(\varOmega\)-cm, E ρ ∼0.09 eV) and ferrimagnetic below 475 K. The SrFe 2/3 Re 1/3 O 3 compound is diffcult to saturate in the magnetization. Mössbauer spectra showed that irons in these compounds are essentially trivalent. The spectra of SrFe 2/3 Re 1/3 O 3 are composed of two lines which can be attributed to the two kinds of Fe 3+ ions located on the two sublattices. Electrical and magnetic properties of Sr 2 FeReO 6 and SrFe 2/3 Re 1/3 O 3 are discussed, taking the crystallographic structured and ionic states of the compounds into consideration.

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