Phase relations, crystal structure, and phase transformation of In1-xNb1-xTi2xO4 (0 <= x < 0.45) in In2O3-Nb2O5-TiO2 system

作者：Su, Liumei; Fan, Xing; Cai, Gemei^*; Liu, Huashan; Jin, Zhanpeng

来源：Journal of Alloys and Compounds, 2015, 651: 97-105.

DOI：10.1016/j.jallcom.2015.08.086

• Phase relation
• Phase transformation
• Crystal structure
• Structure refinement
• In2O3-Nb2O5-TiO2 ternary system

Phase relations, crystal structures, and phase transformation of In1-xNb1-xTi2xO4 (0 <= x < 0.45) in In2O3-Nb2O5-TiO2 ternary system were investigated for the first time. A number of samples with different compositions were prepared by a solid-state reaction method, and phase assembles were analyzed by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), and electron probe micro-analysis (EPMA). Five three-phase regions, ten two-phase regions, and six single-phase solid solutions were determined in this system. The solid solution of In1-xNb1-xTi2xO4 (0 <= x < 0.45) is composed of both ordered monoclinic wolframite-type structure (0 <= x < 0.35) and disordered orthorhombic alpha-PbO2 type structure (0.35 < x < 0.45). Driving force for composition-driven phase transformation in In1-xNb1-xTi2xO4 (0 <= x < 0.45) stems from the ordering of cations. The ever reported compound InNbTiO6 with an orthorhombic alpha-PbO2 type structure was amended to be a monoclinic wolframite-type structure. Present investigations will be useful for the whole ceramic community working with In2O3-Nb2O5-TiO2 ternary system as well as for the development of functional materials.

• 出版日期2015-12-5
• 单位中南大学