Microstructural characterizations on the (1-x)La2/3-TiO3·xLaAlO3 (LTLA) system were conducted using transmission mission electron microscopy. The presence of La2Ti2O7 and La4Ti9O24 phases in pure La2/3TiO3 is confirmed by the electron diffraction pattern. When x = 0.1, the ordering due to the A-site vacancies could be confirmed by the presence of antiphase boundaries (APBs) and 1/2(100) superlattice reflection. As x increases, the ordering decreases and finally disappears when x = 0.6. The tilting of oxygen octahedra could be demonstrated by the presence of the ferroelastic domains in the matrix and 1/2(111) and 1/2(110) superlattice reflections in selected area electron diffraction patterns. In pure LaAlO3, only the antiphase tilting of oxygen octahedra is present due to the presence of 1/2(111) superlattice reflection. In the LTLA system of x = 0.1, both the antiphase and in-phase tiltings of the oxygen octahedra are involved; however, in the range of x from 0.3 to 0.9, the antiphase tilting of oxygen octahedra has appeared. The growth of the ferroelastic domains is influenced by the APBs in the matrix.
|Number of pages||6|
|Journal||Journal of the American Ceramic Society|
|Publication status||Published - 2003 Aug|
ASJC Scopus subject areas
- Ceramics and Composites
- Materials Chemistry