Spin collinearity and thermal disorder in ε-Fe2O3
Spin collinearity and thermal disorder in ε-Fe2O3
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ε-Fe2O3 中的自旋共线性和热无序
DOI：
10.1063/1.2034653
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发表时间：
2005
影响因子：
3.2
通讯作者：
J. Greneche
中科院分区：
文献类型：
--
作者：
E. Tronc;C. Chanéac;J. Jolivet;J. Greneche
报道了用Fe57穆斯堡尔谱(4.2-600K，0-6T)研究二氧化硅中磁电e-Fe_2O_3纳米颗粒(30 Nm)的方法。它们表明在∼130K发生了磁/结构转变，具有类似于FeGaO_3和FeAl_3的高温共线亚铁磁性自旋结构，居里温度T_c为585K。根据结构位置的不同，约化超精细场与T/TC的关系是(S=5/2)布里渊型或朗之万型。300K时的磁化强度为0.25μB/Fe，与已发表的数据一致。
Studies of magnetoelectric e-Fe2O3 nanoparticles (30nm) in silica by Fe57 Mossbauer spectrometry (4.2–600K,0–6T) are reported. They indicate a magnetic/structural transition at ∼130K, a high-temperature collinear ferrimagnetic spin structure similar to FeGaO3 and FeAlO3, and the Curie temperature TC at 585K. Reduced hyperfine field versus T∕TC is (S=5∕2) Brillouin-like or Langevin-like according to the structural site. The magnetization at 300K is estimated to 0.25μB∕Fe in accord with published data.