【摘要】 研究了双钙钛矿结构的氧化物Sr2FeMo1-xNbxO6中Mo位的Nb替代效应,发现Nb替代Mo强烈地抑制了Sr2FeMoO6的铁磁性,居里温度TC也随Nb含量的增加而逐渐降低,直至最终消失;并且存在着团簇玻璃态向自旋玻璃态的转变。指出随着Nb的掺入而引起晶体结构从四方相到正交相的转变是产生上述结果的主要原因。更多还原

【Abstract】 The effect of substituting Mo by Nb of double perovskite compounds Sr₂FeMo_1-xNb_xO₆ has been investigated. The substitution of Nb for Mo suppresses the ferromagnetism of Sr₂FeMoO₆, lowers the Curie temperature Tc of the compounds until it disappears in the compound and there happens the transition from cluster glass gradually to spin glass with increasing Nb⁵⁺ content.The crystal structure transition from a tetragonal structure to an orthorhombic structure by the substitution of Nb⁵⁺ ion is suggested to explain the experimental results.更多还原