LaMnO₃ nanoparticles with different levels of Ag doping are prepared and their impact on defect concentration and crystallite sizes are investigated. The crystallinity studies and phase identifications are done with XRD analysis. Williamson-Hall plots and Size-Strain plots are used to analyse the effect of doping on crystallinity and defect induced microstrain. With the help of Positron Annihilation spectroscopy, the identification of defects and mapping of the defect densities are carried out. Positron lifetime calculations and analysis on Doppler-broadened profile of the positron-electron annihilation radiation in undoped and various doped LaMnO₃ are carried out and compared with W-H plots and size-strain plots.

制备了不同Ag掺杂量的LaMnO ₃纳米颗粒，研究了其对缺陷浓度和晶粒尺寸的影响。结晶度研究和相鉴定是通过XRD分析完成的。Williamson-Hall图和尺寸-应变图用于分析掺杂对结晶度和缺陷诱导的微应变的影响。借助正电子An没光谱，可以进行缺陷识别和缺陷密度映射。进行了正电子寿命计算，并在未掺杂和各种掺杂的LaMnO ₃中对正电子电子radiation灭辐射的多普勒展宽分布进行了分析，并与WH图和尺寸应变图进行了比较。