High-Pressure Synthesis and Correlation between Structure, Magnetic, and Dielectric Properties in LiNbO3-Type MnMO3 (M = Ti, Sn)
High-Pressure Synthesis and Correlation between Structure, Magnetic, and Dielectric Properties in LiNbO3-Type MnMO3 (M = Ti, Sn)
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DOI：
10.1021/ic201006q
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发表时间：
2011-07-04
影响因子：
4.6
通讯作者：
Inaguma, Yoshiyuki
中科院分区：
文献类型：
--
作者：
Aimi, Akihisa;Katsumata, Tetsuhiro;Inaguma, Yoshiyuki
在高温高压条件下合成了LiNbO3型MnMO3（M = Ti，Sn），研究了其结构、磁性能、介电性能和热性能，并讨论了它们之间的关系。光学二次谐波产生和同步辐射粉末X射线衍射测量表明，这两种化合物在室温下具有极性LiNbO3型结构。弱铁磁性由于倾斜的反铁磁相互作用，观察到在25和50 K的MnTiO 3和MnSnO 3，分别。两种化合物在弱铁磁转变温度下均观察到介电常数的异常，表明磁性和介电性质之间的相关性。这些结果表明，铌酸锂型化合物与磁性阳离子是新的候选人的多铁性材料。
LiNbO3-type MnMO3 (M = Ti, Sn) were synthesized under high pressure and temperature; their structures and magnetic, dielectric, and thermal properties were investigated; and their relationships were discussed. Optical second harmonic generation and synchrotron powder X-ray diffraction measurements revealed that both of the compounds possess a polar LiNbO3-type structure at room temperature. Weak ferromagnetism due to canted antiferromagnetic interaction was observed at 25 and 50 K for MnTiO3 and MnSnO3, respectively. Anomalies in the dielectric permittivity were observed at the weak ferromagnetic transition temperature for both the compounds, indicating the correlation between magnetic and dielectric properties. These results indicate that LiNbO3-type compounds with magnetic cations are new candidates for multiferroic materials.