Evolution of Phase Structure and Micro-Morphologies of the La_0.7M_0.3MnO₃ (M=Ca, Sr) Sintered at Different Temperature

Abstract:

The La_0.7M_0.3MnO₃ (M=Ca, Sr) were synthesized by combining sol-gel technique and solid state sintering method. The evolutions of phase structure and micro-morphologies of the La_0.7M_0.3MnO₃ with final sintering temperature (950-1250°C) were investigated. The results show that the La_0.7Ca_0.3MnO₃ compounds exhibit single perovskite phase with cubic structure and the La_0.7Sr_0.3MnO₃ compounds exhibit single perovskite phase with rhombohedra structure. The final sintering temperature has no obvious effect on the phase structure of La_0.7Ca_0.3MnO₃. However, the density and grain size of La_0.7M_0.3MnO₃ (M=Ca, Sr) increase with the increase of the final sintering temperature. Moreover, the micro-morphologies of La_0.7Ca_0.3MnO₃ are more sensitive to final sintering temperature compared with that of La_0.7Sr_0.3MnO₃. When sintering temperature is no less than 1150°C, the La_0.7Ca_0.3MnO₃ has hardly any pore. After sintering at no less than 1250°C, the La_0.7Sr_0.3MnO₃ becomes dense.

• Periodical: Advanced Materials Research (Volume 1095)
• Pages: 402-406
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1095.402
• Online since: March 2015
• Authors: Shao Qun Jiang*, Gang Wang, Zong Shu Li, Ze Hua Wang, Ze Hua Zhou, Jiang Bo Cheng
• Keywords: La_0.7M_0.3MnO₃, Manganite, Perovskite, Sintering Temperature, Sol-Gel

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