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| Correlation Between the Body Color of YAlO3 and Its Defect Equilibrium |
| 作者 | 单位 | E-mail | | 刘勇 | 陕西省大分子科学重点实验室, 陕西师范大学化学与化工学院, 西安 710062 | | | 刘天慧 | 陕西省大分子科学重点实验室, 陕西师范大学化学与化工学院, 西安 710062 | | | 毕淑娴 | 宁夏大学化学化工学院, 银川 750021 | | | 安炜 | 北京大学物理学院, 北京 100871 | | | 李国宝 | 稀土材料化学与应用国家重点实验室, 北京大学化学与分子工程学院, 北京 100871 | | | 田光善 | 北京大学物理学院, 北京 100871 | | | 焦桓 | 陕西省大分子科学重点实验室, 陕西师范大学化学与化工学院, 西安 710062 | jiaohuan@snnu.edu.cn | | 荆西平 | 稀土材料化学与应用国家重点实验室, 北京大学化学与分子工程学院, 北京 100871 | xpjing@pku.edu.cn |
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| Abstract: Powder and pellet samples of YAlO3 with various defect concentrations were prepared using conventional solid state reactions at 1 450 ℃, followed by annealing in air, O2 or N2 atmospheres at various temperatures. The correlation between the body-color of the samples and the defect equilibria was investigated by diffuse-reflection spectra and AC impedance data. The results indicate that YAlO3 has p-type conduction and its light-brown body-color is caused by the cation vacancies. Annealing YAlO3 at high temperature in N2 atmosphere may reduce the defect concentration and the body-color. By the first-principle calculations, it is proposed that the Al vacancies VAl× may be the dominant defects in YAlO3. |
| Keywords: YAlO3 body-color cation vacancy diffuse~reflection spectrum AC impedance |
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