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

doi:10.1143/jjap.41.717

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

Department of Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

24 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 (τ_f) 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 τ_f = -2.0 ppm/°C were obtained for (1 - x)NdGaO₃-xCaTiO₃ ceramic.

Original language	English
Pages (from-to)	717-721
Number of pages	5
Journal	Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume	41
Issue number	2 A
DOIs	https://doi.org/10.1143/jjap.41.717
Publication status	Published - 2002 Feb

Keywords

CaTiO
Dielectric properties
Micro-structure
Microwave ceramics
NdGaO

ASJC Scopus subject areas

Engineering(all)
Physics and Astronomy(all)

Access to Document

10.1143/jjap.41.717

Cite this

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title = "Dielectric properties of (1 - x)NdGaO3-xCaTiO3 solid solution at microwave frequencies",

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.",

keywords = "CaTiO, Dielectric properties, Micro-structure, Microwave ceramics, NdGaO",

author = "Kim, {Min Han} and Sahn Nahm and Choi, {Chang Hak} and Lee, {Hwack Joo} and Park, {Hyun Min}",

year = "2002",

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AU - Kim, Min Han

AU - Nahm, Sahn

AU - Choi, Chang Hak

AU - Lee, Hwack Joo

AU - Park, Hyun Min

PY - 2002/2

Y1 - 2002/2

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.

KW - CaTiO

KW - Dielectric properties

KW - Micro-structure

KW - Microwave ceramics

KW - NdGaO

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