New Magnetic Materials Obtained by Ion-exchange Reactions from Non-magnetic Layered Perovskites
New Magnetic Materials Obtained by Ion-exchange Reactions from Non-magnetic Layered Perovskites
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非磁性层状钙钛矿离子交换反应获得的新型磁性材料
DOI：
10.1088/0953-8984/16/11/003
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发表时间：
2004
期刊：
影响因子：
--
通讯作者：
J. Wiley
中科院分区：
文献类型：
--
作者：
H. Kageyama;L. Viciu;G. Caruntu;Y. Ueda;J. Wiley
以非磁性钙钛矿衍生物ACa2Ta3O10 （A = Rb, Li）为原料，在相应的无水熔盐中进行离子交换反应，制备了新型层状磁性材料（MCl）Ca2Ta3O10 （M = Cu, Fe）。产品的粉末x射线衍射图被成功地检索到，假设立方体对称，Cu的细胞尺寸为a = 3.829 a和c = 15.533 a， Fe的细胞尺寸为a = 3.822 a和c = 15.672 a。由Ca2Ta3O10三层钙钛矿板隔开，过渡金属氯化物（MCl）网络提供了一个二维磁晶格。磁化率测量表明（CuCl）Ca2Ta3O10在8k以下处于反铁磁态，而（FeCl）Ca2Ta3O10在91和125 K处有两个异常，表明由于几何自旋受挫导致的连续相变。
New layered magnetic materials, (MCl)Ca2Ta3O10 (M = Cu, Fe), have been prepared by ion-exchange reactions of non-magnetic perovskite derivatives, ACa2Ta3O10 (A = Rb, Li), in corresponding anhydrous molten salts. Powder x-ray diffraction patterns of the products are successfully indexed assuming tetragonal symmetry with cell dimensions a = 3.829 A and c = 15.533 A for Cu, and a = 3.822 A and c = 15.672 A for Fe. Being separated by the Ca2Ta3O10 triple-layer perovskite slabs, the transition-metal chloride (MCl) network provides a two-dimensional magnetic lattice. Magnetic susceptibility measurements show that (CuCl)Ca2Ta3O10 is in an antiferromagnetic state below 8 K, while (FeCl)Ca2Ta3O10 has two anomalies at 91 and 125 K, suggesting successive phase transitions due to geometrical spin frustration.