常压合成LiNbO_(3)-MnTiO_(3)固溶相单晶及其磁性能  

Atmospheric pressure synthesis of LiNbO_(3)-MnTiO_(3)solid-solution single crystal and their magnetoelectric properties

作　　者：宋海利 赵爽 李满荣 SONG Haili;ZHAO Shuang;LI Manrong(School of Chemistry,Sun Yat-sen University,Guangzhou 510006,China;School of Chemistry and Chemical Engineering,Hainan University,Haikou 570228,China)

机构地区：[1]中山大学化学学院,广东广州510006 [2]海南大学化学化工学院,海南海口570228

出　　处：《中山大学学报（自然科学版）（中英文）》2024年第5期125-130,共6页Acta Scientiarum Naturalium Universitatis Sunyatseni

基　　金：广东省基础与应用基础研究基金(2020A1515110178)。

摘　　要：利用常压固相法合成掺杂10%和20%MnTiO_(3)的LiNbO_(3)-MnTiO_(3)固溶相单晶,通过X射线衍射仪和球差校正透射电镜分析样品的结构特征,探究固溶相单晶的磁电性能和光学带隙变化。研究发现:MnTiO_(3)相均匀掺杂在母相LiNbO_(3)中并维持LiNbO_(3)-R3c结构。由于MnTiO_(3)的掺杂,低温状态下样品表现弱磁性,且磁性来源于高自旋态的Mn^(2+)。同时,基于母相LiNbO_(3)的铁电效应,固溶相表现出明显的极性。此外,随着MnTiO_(3)掺杂量的增大,固溶相样品的光学带隙逐渐减小。LiNbO_(3)-MnTiO_(3)solid-solution single crystal doped with 10%and 20%MnTiO_(3)were synthesized by solid-state method at atmospheric pressure,and the structural characteristics of the samples were analyzed by X-ray diffractometer and spherical aberration corrected transmission electron microscope.The magnetoelectric properties and optical bandgap changes of the solid-solution single crystals were also studied.It was found that the MnTiO_(3)phase was homogeneously doped in the parent LiNbO_(3)phase and maintained the LiNbO_(3)-R3c structure.Due to the doping of MnTiO_(3),the sample exhibits weak magnetism at low temperature,which is derived from the high-spin state of Mn^(2+).Originated from the ferroelectric effect of the parent LiNbO_(3),the solid-solution exhibits obvious polarity.In addition,with the increase of MnTiO_(3),the optical band gap of the sample gradually decreases.

关 键 词：常压固相法 MnTiO_(3) LiNbO_(3) 磁性 

分 类 号：TB34[一般工业技术—材料科学与工程] TM27[电气工程—电工理论与新技术]