Abstract
Microstructure studies on the (1 - x)Nd2/3TiO 3-AdAlO3 (NTNA) system were carried out using transmission electron microscopy. The presence of Nd2Ti2O7 and Nd4Ti9O24 phases in pure Nd 2/3TiO3 is confirmed from electron diffraction patterns. At x = 0.1, the ordering due to A-site vacancies is confirmed by the presence of antiphase boundaries and (1/2)(100) superlattice reflection. As x increases, the degree of ordering decreases and finally disappears at x = 0.7. The tilting of oxygen octahedra is demonstrated by the presence of the ferroelastic domains in the matrix and the (1/2)(111) and (1/2)(110) superlattice reflections in selected-area electron diffraction patterns. In the NTNA system of x = 0.1, both the antiphase and inphase tilting of oxygen octahedra are involved; however, in the range of x from 0.5 to 1.0, only the antiphase tilting of oxygen octahedra is observed due to the presence of the (1/2)(111) superlattice reflection and ferroelastic domains. The variations in the measured dielectric properties of NTNA (dielectric constant and Q · f) are consistent with those in the dielectric properties of the (1 - x)La2/3TiO3-xLaAlO 3 (LTLA) system obtained by Lee et al.
Original language | English |
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Pages (from-to) | 7587-7591 |
Number of pages | 5 |
Journal | Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers |
Volume | 43 |
Issue number | 11 A |
DOIs | |
Publication status | Published - 2004 Nov |
Keywords
- Antiphase boundaries
- Dielectric properties
- Ferroelastic domain
- Microwave dielectric material
- NdAlO3
- NdTio
- Ordering of vacancy
- Structural transition analysis
- Tilting of oxygen octahedron
ASJC Scopus subject areas
- Engineering(all)
- Physics and Astronomy(all)