VALENCE STATE OF THE FE IONS IN SR1-YLAYFEO3
VALENCE STATE OF THE FE IONS IN SR1-YLAYFEO3
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DOI：
10.1016/0022-4596(81)90304-2
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发表时间：
1981-01-01
影响因子：
3.3
通讯作者：
TAKEDA, Y
中科院分区：
文献类型：
--
作者：
TAKANO, M;KAWACHI, J;TAKEDA, Y
本文主要用穆斯堡尔效应研究了Sr2 + 1− yLa3 + yFeO3（0.1 μ y = 0.6）体系。并以Ca 1− x Sr x FeO 3系统为例进行了讨论。观察到了顺磁、反铁磁平均价态相和相应的混合价态相。两种铁离子共存，在一般情况下，在混合价相。在反铁磁混合价相，通常在4 K，磁超精细场和中心位移的值都有很大的范围，这取决于组成，而它们之间保持着美丽的相关性。极端值接近Fe 3+和Fe 5+的预期值。因此，合适的化学式为Ca 1− x Sr x Fe（3+ Δ）+ 0.5 Fe（5− Δ）+ 0.5 O 3和Sr 1− y La y Fe（3+ δ）+（1+ y）2 Fe（5− δ）+（1− y）2 O 3。
Abstract The Sr 2+ 1− y La 3+ y FeO 3 system with 0.1≦ y≦ 0.6 has been studied mainly by the Mössbauer effect. The results are discussed referring to the Ca 1− x Sr x FeO 3 system. The following four kinds of electronic phases have been observed: the paramagnetic and the antiferromagnetic average valence phases and the corresponding mixed valence phases. Two kinds of Fe ions coexist, in general, in the mixed valence phases. In the antiferromagnetic mixed valence phase, typically at 4 K, the magnetic hyperfine field and the center shift each takes a wide range of value depending on the composition, while a beautiful correlation is kept between them. The extreme values are close to those expected for Fe 3+ and Fe 5+. The appropriate chemical formulas are, therefore, Ca 1− x Sr x Fe (3+ Δ)+ 0.5 Fe (5− Δ)+ 0.5 O 3 and Sr 1− y La y Fe (3+ δ)+(1+ y) 2 Fe (5− δ)+(1− y) 2 O 3.