Structures and microwave dielectric properties of Ca(1-x)Nd2x/3TiO3 ceramics

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Abstract

Ca(1-x)Nd2x/3TiO3 microwave dielec. ceramics were prepd. by the mixed oxide route; powders were calcined at 1100°C and sintered at 1450-1500°C. High d., single phase products were obtained for all compns. Grain sizes ranged from 1 μm to 100 μm. There was evidence of significant discontinuous grain growth in mid range compns.; all ceramics were characterized by complex domain structures. With increasing Nd content there was a evidence of a transition from an orthorhombic Pbnm structure to a monoclinic C2/m structure. This was accompanied by a decrease in relative permittivity (εr) from 180 to 78, and decrease in the temp. coeff. of resonant frequency (τf) from +770 ppm K-1 to +200 ppm K-1. The product of dielec. Q value and resonant frequency (Q × f) varied in a grossly non-systematic way, exhibiting a peak at 13,000 GHz in Ca0.7Nd0.2TiO3. [on SciFinder(R)]
Original languageEnglish
Pages (from-to)3791-3799
Number of pages9
JournalJ. Eur. Ceram. Soc.
Volume32
Issue number14
DOIs
Publication statusPublished - Nov 2012

Keywords

  • Perovskites
  • Dielectric properties
  • Electron microscopy
  • X-ray methods

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