A位具有混合价态的钙钛矿氧化物Eu_(1-x)K_xTiO_3(x=0.2,0.32)的高温高压合成  

THE SYNTHESIS OF PEROVSKITES Eu_(1-x)K_xTiO_3(x=0.2,0.32) WITH MIXED VALENCE IN A-SITE UNDER HIGH PRESSURE AND TEMPERATURE

作　　者：宋小羽[1] 苗继鹏[1] 李莉萍[1,2] 苏文辉[1,3] 

机构地区：[1]吉林大学物理系 [2]吉林大学无机合成与制备开放实验室,长春130023 [3]中国科学院国际材料物理中心,沈阳110015

出　　处：《高压物理学报》2000年第1期37-41,共5页Chinese Journal of High Pressure Physics

基　　金：国家自然科学基金!资助 ( 1980 40 0 5 )

摘　　要：以TiO2 和Eu2 O3为原料 ,利用固相反应法在 4.0GPa和 10 90℃下合成了钙钛矿氧化物Eu1-xKxTiO3(x =0 .2 ,0 .32 )。XRD测量表明样品为立方结构。151EuMo　¨ssbauer谱测试给出同质异能移位分别为～ 0mm/s和～ - 13mm/s的两个吸收峰 ,表明Eu离子为 +2和 +3混合价。在 480和64 80G的磁场范围内只观察到一个线宽为 314 0G、g因子为 2 .0 0的信号 ,这是由Eu2 + 产生的。在EPR谱上没有观察到Ti3+ 和A位缺位的信号 ,说明在样品中的Ti在B位是 +4价的。在固态反应中 ,Eu3+ 离子比Ti4 + 离子更容易被还原。The perovskite oxides Eu 1- x K x TiO 3 ( x =0.2 and 0.32) were synthesized under 4.0 GPa and at 1090℃ with the starting materials TiO 2 and Eu 2O 3.XRD measurements show that the samples are cubic. 151 Eu Mo ¨ssbauer spectra exhibits two peaks at ca. 0 and -13mm/s,which suggests that Eu ions are in mixed valence of +2 and +3.Only one signal with linewidth 3140 Guss and g =2.00 is observed within the range of 480 to 6480G.The absence of the signals associated with Ti 3+ and A site deficiency indicates that Ti ions is Ti 4+ .In the process of solid state reaction,Eu 3+ ions are easier reduced than Ti 4+ .

关 键 词：高压高温 EPR 钙钛矿氧化物 铕 

分 类 号：O614.338[理学—无机化学]