Microwave dielectric properties of (1-x)(Na 1/2Nd 1/2)TiO 3-xLa(Mg 1/2Ti 1/2)O 3 via ordering and far IR reflectivity spectra

Jae Beom Kim, Ki Hyun Yoon, Yong Soo Cho, Woo Sup Kim, Eung Soo Kim

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Microwave dielectric properties of (1-x)(Na 1/2Nd 1/2TiO 3 (NNT)-xLa(Mg 1/2Ti 1/2)O 3(LMT) system have been investigated with focus on structural ordering and far IR reflectivity spectra. A single perovskite phase was found to exist with various superlattice reflections over the entire compositional range. 1:1 ordering observed in the (111) reflection of X-ray diffraction patterns was found to progress significantly in the specimens above x = 0.8. The ordering characteristics that presumably related to B-site Mg/Ti ordering were assumed to affect favorably the quality factor at microwave frequencies. The increase of the quality factor also could be explained in terms of the decrease of lattice anharmonicity with LMT by analysis of far IR reflectivity spectra. As expected from the values of pure NNT and LMT, the dielectric constant and the temperature coefficient of frequency tended to gradually decrease with increasing LMT content.

Original languageEnglish
Pages (from-to)612-616
Number of pages5
JournalJournal of the American Ceramic Society
Volume88
Issue number3
DOIs
Publication statusPublished - 2005 Dec 1

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

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