Dielectric properties of (1 - x)NdGaO3-xCaTiO3 solid solution at microwave frequencies

Min Han Kim, Sahn Nahm, Chang Hak Choi, Hwack Joo Lee, Hyun Min Park

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Abstract

Microstructure and microwave dielectric properties of (1 -x)NdGaO3-xCaTiO3 ceramics have been investigated. Crystal structure of all the specimens was orthorhombic and the lattice parameters decreased with an increase of x. For specimens with x ≤ 0.5, a Nd3Ga5O12 phase was observed. The Q value of Nd3Ga5O12 ceramics was about 10,000 at 12 GHz and the dielectric constant (∈r) was about 12. A liquid phase was found in the specimens with x ≥ 0.5, containing a high concentration of Ca and Ga ions. The dielectric constant and the temperature coefficient of resonant frequency (τf) of the specimens increased with an increase of x. The Q × f value of the NdGaO3 specimen was about 85,000 GHz and it decreased inversely with x. Excellent microwave dielectric properties of Q × f = 46, 000 GHz, ∈r = 45 and τf = -2.0 ppm/°C were obtained for (1 - x)NdGaO3-xCaTiO3 ceramic.

Original languageEnglish
Pages (from-to)717-721
Number of pages5
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume41
Issue number2 A
Publication statusPublished - 2002 Feb 1

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Keywords

  • CaTiO
  • Dielectric properties
  • Micro-structure
  • Microwave ceramics
  • NdGaO

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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