Title :
Study on the defect chemistry of Ca2+ as acceptor dopant in BaTiO3
Author :
XiaoWen, Zhang ; Ying, Wang ; Longt, Li
Author_Institution :
Tsinghua Univ., Beijing, China
Abstract :
The measurement of high-temperature conductivity and positron annihilation lifetime were used to analyze the defect chemistry of Ca-doped BaTiO3. The results show that Ca2+ can substitute for Ti4+ and act as an acceptor dopant. The maximum solid solubility of Ca2+ at the Ti4 site is nearly 1.5 mol%. The solubility of Ca2+ is consistent with the result obtained by XRD measurement published previously. Ca2+ as an acceptor impurity is more efficient than others such as Al 3+. This may be related to the electron configuration of the ion
Keywords :
barium compounds; calcium; ceramics; dielectric materials; electrical conductivity of crystalline semiconductors and insulators; impurity electron states; positron annihilation in liquids and solids; solid solubility; BaTiO3:Ca2+; XRD measurement; acceptor dopant; defect chemistry; electron configuration; high-temperature conductivity; positron annihilation lifetime; solid solubility; Barium; Calcium; Chemistry; Conductivity measurement; Electrodes; Positrons; Raw materials; Semiconductor materials; Temperature; Titanium compounds;
Conference_Titel :
Properties and Applications of Dielectric Materials, 1988. Proceedings., Second International Conference on Properties and Applications of
Conference_Location :
Beijing
DOI :
10.1109/ICPADM.1988.38365
