Effect of Sintering Temperature on Phase Characteristic and Grain Size of La۰.۷AE۰.۳MnO۳ (AE=Ba/Ca/Sr) Ceramics Prepared by Sol-Gel Method

We investigate the impact of sintering temperature on changes in phase characteristics and grain size in the La۰.۷AE۰.۳MnO۳ (AE=Ba/Ca/Sr) materials synthesized by the sol-gel method. The materials were sintered at different sintering temperatures of ۷۰۰°C, ۸۰۰°C, ۹۰۰°C, and ۱۲۰۰°C. The refinement of the X-ray Diffraction (XRD) pattern revealed that the La۰.۷Ca۰.۳MnO۳ and La۰.۷Sr۰.۳MnO۳ materials exhibited a single phase across all sintering temperatures. For La۰.۷Ba۰.۳MnO۳, a single-phase structure was observed only at sintering temperature above ۸۰۰°C. All materials showed an increase in peak intensity and a shift in peak in the range angle ۳۱°-۳۴° towards higher angles correlated to increased sintering temperature. Sintering temperature plays an important role in controlling the grain size. Images obtained by Scanning Electron Microscope (SEM) showed the morphology of La۰.۷Sr۰.۳MnO۳ sintered at different temperatures (۷۰۰°C, ۸۰۰°C, and ۹۰۰°C). The morphology results show an increment in the average grain size with range of ۴۱.۰۵ – ۶۹.۲۷nm because of the grain growth as the sintering temperature.

کلیدواژه ها:

Perovskite ، Lanthanum manganite ، Sintering Temperature ، Grain size ، Sol-gel