“分子合金”类普鲁士蓝配合物Co_(0.25)Mn_(1.25)[Fe(CN)_6]·5.9H_2O的磁性研究

Magnetic Properties of "Molecular Alloys" Prussisa Blue Co_(0.25)Mn_(1.25)[Fe(CN)_6]·5.9H_2O

合成了多金属普鲁士蓝类配合物Co0.25Mn1.25[Fe(CN)6]·5.9H2O并测定其磁学性质。变温磁化率研究表明:化合物存在亚铁磁性交换相互作用,磁相变温度Tc是9.5K;由场冷却(FC)磁化强度和零场冷却(ZFC)磁化强度曲线和交流磁化曲线上磁化率证实化合物存在自旋玻璃态行为。观测到化合物的矫顽场Hc是230Oe,剩余磁化强度Mr是0.072μβ。样品的室温穆斯堡尔谱中出现一个双峰,它的同质异能移(IS)为-0.15(4)mm/s,四极分裂(QS)为0.41(9)mm/s,这一参数说明配合物Co0.25Mn1.25[Fe(CN)6]·5.9H2O中有低自旋的三价铁离子存在。同时该化合物存在磁有序与自旋玻璃态行为。

A multi-metal Prussisa blue compound Co0.25Mn1.25[Fe（CN）6]·5.9H2O has been synthesized.The magnetic property of the compound was measured.The temperature-dependent magnetic susceptibilities indicate that there exists a ferrimagnetic exchange interaction in the compound,and magnet transition at 9.5 K.It has been confirmed that there exists a spin-glass behave in the compound through Zero-field-cooled（ZFC） and field-cooled（FC） magnetization curves,and AC magnetization curves.The observed value of coercive field（Hc） and remanent magnetization（Mr） for the compound are 230 Oe and 0.072 μβ.Room temperature Mossbauer spectrum reveals a doublet with the isomer shift parameter（-0.15（4） mm/s） and quadrupole splitting（QS=0.41（9） mm/s） characteristic for low-spin Fe（Ⅲ） ions in compounds Co0.25Mn1.25[Fe（CN）6]·5.9H2O.Inaddition,there exists a spin-glass behaviour in the compound.