In:
Advanced Materials Research, Trans Tech Publications, Ltd., Vol. 1120-1121 ( 2015-7), p. 507-511
Abstract:
The La 0.7 Sr x Ca 0.3- x MnO 3 ( x =0, 0.05, 0.1, 0.15, 0.2, 0.25 and 0.3) were prepared by combining sol-gel method and high temperature sintering. The effects of Sr doping content on the structure and morphologies of the La 0.7 Sr x Ca 0.3- x MnO 3 finally sintered at 1050°C/1250°C were investigated based on the analyses of X-ray diffraction (XRD) and Scanning Electron Microscope (SEM). The results show that the La 0.7 Sr x Ca 0.3- x MnO 3 exhibit single perovskite phase and the change of Sr doping content can result in phase structure transition. The La 0.7 Sr x Ca 0.3- x MnO 3 samples are rhombohedra structure in the range of 0.15≤ x ≤0.3. When x is no more than 0.1, the La 0.7 Sr x Ca 0.3- x MnO 3 samples sintered at 1050°C present distorted cubic structure. The microstructure of La 0.7 Sr x Ca 0.3- x MnO 3 sintered at 1050°C for 5h becomes more and more looser and its grains tend to refinement with the increase of Sr doping content when x is no less than 0.05. Increasing the final sintering temperature can improve the density and promote the grain growth of La 0.7 Sr x Ca 0.3- x MnO 3 . In order to gain a dense microstructure, the final sintering temperature of La 0.7 Sr x Ca 0.3- x MnO 3 should be higher than 1050°C and should be suitably increased with the increase of Sr doping content.
Type of Medium:
Online Resource
ISSN:
1662-8985
DOI:
10.4028/www.scientific.net/AMR.1120-1121
DOI:
10.4028/www.scientific.net/AMR.1120-1121.507
Language:
Unknown
Publisher:
Trans Tech Publications, Ltd.
Publication Date:
2015
detail.hit.zdb_id:
2265002-7