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

Research output: Contribution to journalArticle

19 Citations (Scopus)

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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Microwave frequencies
microwave frequencies
Dielectric properties
dielectric properties
Solid solutions
Permittivity
solid solutions
Microwaves
Lattice constants
Natural frequencies
ceramics
Crystal structure
Microstructure
permittivity
Ions
Liquids
microwaves
resonant frequencies
lattice parameters
liquid phases

Keywords

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

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Cite this

Dielectric properties of (1 - x)NdGaO3-xCaTiO3 solid solution at microwave frequencies. / Kim, Min Han; Nahm, Sahn; Choi, Chang Hak; Lee, Hwack Joo; Park, Hyun Min.

In: Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers, Vol. 41, No. 2 A, 01.02.2002, p. 717-721.

Research output: Contribution to journalArticle

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AU - Choi, Chang Hak

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AU - Park, Hyun Min

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N2 - 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.

AB - 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.

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