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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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A位具有混合价态的钙钛矿氧化物Eu1-xKxTiO3（x=0.2，0.32）的高温高压合成
DOI: 10.11858/gywlxb.2000.01.007, PP. 37-41
Keywords: 高压高温,Eu1-xKxTiO3,Mossbauer谱,EPR
Abstract:
以TiO2和Eu2O3为原料，利用固相反应法在4.0GPa和1090℃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。151EuMossbauer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6480G的磁场范围内只观察到一个线宽为3140G、g因子为2.00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。
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