Y_(2-x)(LiMg)_xMo_3O_(12)固溶体吸水性与热膨胀性能研究  

Hygroscopicity and Thermal Expansion Properties of Y_(2-x)(LiMg)_xMo_3O_(12) Solid Solutions

作　　者：程永光[1,2] 刘献省[1] 宋文博[1] 袁保合[1] 王献立[1] 梁二军[1] 晁明举[1] 

机构地区：[1]郑州大学物理工程学院教育部材料物理重点实验室,郑州450052 [2]河南工程学院理学院,分析测试中心,郑州451191

出　　处：《光散射学报》2014年第3期258-264,共7页The Journal of Light Scattering

基　　金：国家自然科学基金(10974183;11104252);郑州市创新团队(2011-3)

摘　　要：Y2-x(LiMg)xMo3O12固溶体(x=0、0.1、0.3、0.5、0.7、0.9、1.1、1.3、1.5、1.7、1.9和2.0)采用固相法制备。当x=0时,由于严重吸水,拉曼峰宽化。随着(LiMg)掺入量的增加,拉曼峰趋于尖锐并发生劈裂,说明固溶体的吸水性得到明显的降低,结晶性能提高,变温拉曼光谱显示失水对应的温度也在降低。在900cm-1和370cm-1附近出现的新峰,与Li-O和Mg-O的振动有关。随着(LiMg)量的增加,Li-O和Mg-O的振动加强,并导致MoO4与YO6振动减弱,也可能与热膨胀系数的变化有关。Y2-x（LiMg）xMo3O12（x =0,0.1,0.3,0.5,0.7,0.9,1.1,1.3,1.5,1.7,1.9and 2.0）solid solutions are synthesized using solid state method.When x =0,due to the hygroscopicity,the Raman peaks widen.With the increase of（LiMg）,Raman peak tends to be sharp and splitting occurs,which indicates that the hygroscopicity of the solid solutions is significantly decreased and the degree of crystallinity increases,and the temperature of releasing crystal water becomes lower according to temperature dependent Raman spectra.The new Raman peaks at around 900 and 370cm^-1 are ascribed to the vibrations of Li-O and MgO.With increasing the content of（LiMg）,the vibrations of Li-O and Mg-O strengthen while the vibrations of MoO4 and YO6weaken,which could result in change of thermal expansion.

关 键 词：固溶体 负热膨胀 拉曼光谱 吸水性 

分 类 号：O469[理学—凝聚态物理] TB39[理学—电子物理学]