Microstructural changes in (1 - X)Nd2/3TiO3- xNdAlO3 system

Hwack Joo Lee, Jin Ok Son, Sang Ho Oh, Yang Koo Cho, Sahn Nahm

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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 languageEnglish
Pages (from-to)7587-7591
Number of pages5
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume43
Issue number11 A
DOIs
Publication statusPublished - 2004 Nov 1

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Keywords

  • Antiphase boundaries
  • Dielectric properties
  • Ferroelastic domain
  • Microwave dielectric material
  • NdTio
  • NdAlO3
  • Ordering of vacancy
  • Structural transition analysis
  • Tilting of oxygen octahedron

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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