An investigation of cation vacancies in Pb (Zr0.95Ti0.05)O3 thin films using positron annihilation
An applied electric field can reversibly change the temperature of an electrocaloric material under adiabatic conditions, and the effect is strongest cation vacancies Positron Annihilation Lifetime Spectroscopy (PALS)for identify point defects applicable to the study of technologically relevant pyroelectric oxide materials have been investigated, For this study a PALS spectrometer was constructed Lead zirconium titanate films were studied and gave consistent values for the lifetime resulting from positron localization at lead vacancies VPb. Positron trapping to B-site vacancies was inferred in PZT films. Temperature dependent studies showed that the defect specific trapping rate was higher for VB compared to VPb, consistent with the larger negative charge. Doping PZT films with La increased the fraction positron trapping to VB compared to VPb-type defects.
Yu Dashu Jiao Yonghen
College of Physics and Electronic Information Science ,Tianjin Normal University ,P.R.China ,Tianjin ,300384
国际会议
第九届国际正电子与正电子素国际会议(9th International Workshop on Positron and Positronium Chemistry)(PPC–9)
武汉
英文
97
2008-05-11（万方平台首次上网日期，不代表论文的发表时间）