Synthesis, structure analysis and magnetic properties of Ca₂TiMnO₆ oxides

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• 作者：Xiaowei Cao ; Yangai Liu ; ^{liuyang@cugb.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Zhaohui Huang ; Minghao Fang ; Xiaowen Wu
• 关键词：C. Magnetic properties ; Ca2TiMnO6 ; Double perovskite ; Spin glass
• 刊名：Ceramics International
• 出版年：2015
• 出版时间：December 2015
• 年：2015
• 卷：41
• 期：10
• 页码：14184-14189
• 全文大小：1189 K

文摘

Ca₂TiMnO₆ compounds were synthesized by the conventional solid-state reaction in air. The crystal structure and magnetic properties were investigated. Characterization of X-ray diffractions and the refinement analysis confirmed the orthorhombic (space group Pbnm) structure of Ca₂TiMnO₆ at room temperature. Magnetic measurements reveal that the double perovskite Ca₂TiMnO₆ has antiferromagnetic interactions at low temperature and a paramagnetic order above 40 K. According to the Curie–Weiss fitting at high temperature, the Neel constant 胃_p and experimental efficient moment 渭_eff was estimated to be about −161.98 K and 4.91 渭_B, respectively. The theoretical efficient moment was calculated to be 3.87 渭_B. The XPS analysis indicates that the difference between experimental and theoretical efficient moment caused by the mixed valence state of Mn in Ca₂TiMnO₆. The temperature dependence of coercivity field shows a soft magnetic property in Ca₂TiMnO₆ oxides. The mechanism of the low temperature anomaly which was appeared in magnetization curve was discussed in detail.