Effects of Ho-doping on Crystal Structure and Microstructure of La0.7Sr0.3MnO3 Ceramics
Crystal structure and microstructure of La0.7-xHoxSr0.3MnO3 (x=0.2,0.6) prepared by usual ceramic techniques and grinding procedure were investigated using X-ray diffraction (XRD) and transmission electron microscopy (TEM).When doping amount x equals to 0.2,incorporation of Ho atoms contributed to phase separation and coexistence of rhombohedral (La0.7Sr0.3MnO3) and hexagonal (HoMnO3) phases.La0.7Sr0.3MnO3 phase is of typical perovskite structure,whereas,HoMnO3 phase is non-perovskite structure.As x reaches 0.6,the volume fraction of HoMnO3 phase was significantly increasing.Meanwhile,an orthorhombic lattice with perovskite structure and space group Pnma can be observed.It prevented from partial substitution of La 3+ or Sr2+ by Ho3+ and the distortion of Mn-O octahedra.
Crystal structure Microstructure Substitution Orthorhombic lattice Mn-O octahedra
Benzhe Sun Silang Zhou Tie Shen
College of Science, Northeastern University, Shenyang 110004, China Equipment Engineering Company of Liaohe Petroleum Exploration Bureau, Panjin 124010,China
国际会议
the Chinese Materials Congress 2012(2012年中国材料大会(CMC2012))
太原
英文
96-101
2012-07-13（万方平台首次上网日期，不代表论文的发表时间）