Crystal structure and microwave dielectric properties of CaTiO3-(Li1/2Nd1/2) TiO3-(Ln1/3Nd1/3)TiO3 (Ln = La, Dy) ceramics

Jeong Seog Kim; Chae Il Cheon; Hyun Joo Kang; Chang Hee Lee; Kyung Yong Kim; Sahn Nam; Jae Dong Byun

doi:10.1143/jjap.38.5633

Crystal structure and microwave dielectric properties of CaTiO₃-(Li_1/2Nd_1/2) TiO₃-(Ln_1/3Nd_1/3)TiO₃ (Ln = La, Dy) ceramics

Jeong Seog Kim, Chae Il Cheon, Hyun Joo Kang, Chang Hee Lee, Kyung Yong Kim, Sahn Nam, Jae Dong Byun

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

50 Citations (Scopus)

Abstract

Crystal structure and microwave dielectric properties of a x-CaTiO_3-y(Li_1/2Nd_1/2)TiO_3-z(Ln _1/3Nd_1/3)TiO₃ (Ln = La, Dy) ternary system were studied. Crystal structures were refined by the Rietveld method using X-ray and neutron diffraction data. (Li_1/2Nd_1/2)TiO₃ and 0.2CaTiO₃-0.8(La_1/3Nd_1/3)TiO₃ ceramics showed the most reliable R-values with a tetragonal structure with a space group P-4b2 and lattice constants of a = b ≈ 5.4 Å, and c ≈ 7.6 Å. The A-site cations were ordered along the c-axis. When x ≥ 0.3, the crystal structure changed to an orthorhombic CaTiO₃ type. The xCaTiO_3-y(Li_1/2Nd_1/2)TiO₃-z(La _1/3Nd_1/3)TiO₃ system showed microwave dielectric properties of ε_r = 133, Q · f = 1,450 GHz and τ_f = -17ppm/°C at a composition of.Y = 0.2, y = 0.68, z = 0.12. In xCaTiO_3-y(Li_1/2Nd_1/2)TiO_3-z(Dy _1/3Nd_1/3)TiO₃, dielectric properties of ε_r, = 97.6, Q · f = 5, 150 GHz and τ_f = +0.4 ppm/°C were obtained at x = 0.30, y = 0.40, z = 0.30. The effect of each ternary system component on the dielectric properties is discussed.

Original language	English
Pages (from-to)	5633-5637
Number of pages	5
Journal	Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume	38
Issue number	9 B
DOIs	https://doi.org/10.1143/jjap.38.5633
Publication status	Published - 1999
Externally published	Yes

Keywords

Microwave dielectric ceramics
Structure refinement
Ternary system
Tetragonal, (LaNd)TiO

ASJC Scopus subject areas

Engineering(all)
Physics and Astronomy(all)

Access to Document

10.1143/jjap.38.5633

Cite this

Crystal structure and microwave dielectric properties of CaTiO₃-(Li_1/2Nd_1/2) TiO₃-(Ln_1/3Nd_1/3)TiO₃ (Ln = La, Dy) ceramics. / Kim, Jeong Seog; Cheon, Chae Il; Kang, Hyun Joo et al.

In: Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers, Vol. 38, No. 9 B, 1999, p. 5633-5637.

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

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title = "Crystal structure and microwave dielectric properties of CaTiO3-(Li1/2Nd1/2) TiO3-(Ln1/3Nd1/3)TiO3 (Ln = La, Dy) ceramics",

abstract = "Crystal structure and microwave dielectric properties of a x-CaTiO3-y(Li1/2Nd1/2)TiO3-z(Ln 1/3Nd1/3)TiO3 (Ln = La, Dy) ternary system were studied. Crystal structures were refined by the Rietveld method using X-ray and neutron diffraction data. (Li1/2Nd1/2)TiO3 and 0.2CaTiO3-0.8(La1/3Nd1/3)TiO3 ceramics showed the most reliable R-values with a tetragonal structure with a space group P-4b2 and lattice constants of a = b ≈ 5.4 {\AA}, and c ≈ 7.6 {\AA}. The A-site cations were ordered along the c-axis. When x ≥ 0.3, the crystal structure changed to an orthorhombic CaTiO3 type. The xCaTiO3-y(Li1/2Nd1/2)TiO3-z(La 1/3Nd1/3)TiO3 system showed microwave dielectric properties of εr = 133, Q · f = 1,450 GHz and τf = -17ppm/°C at a composition of.Y = 0.2, y = 0.68, z = 0.12. In xCaTiO3-y(Li1/2Nd1/2)TiO3-z(Dy 1/3Nd1/3)TiO3, dielectric properties of εr, = 97.6, Q · f = 5, 150 GHz and τf = +0.4 ppm/°C were obtained at x = 0.30, y = 0.40, z = 0.30. The effect of each ternary system component on the dielectric properties is discussed.",

keywords = "Microwave dielectric ceramics, Structure refinement, Ternary system, Tetragonal, (LaNd)TiO",

author = "Kim, {Jeong Seog} and Cheon, {Chae Il} and Kang, {Hyun Joo} and Lee, {Chang Hee} and Kim, {Kyung Yong} and Sahn Nam and Byun, {Jae Dong}",

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T1 - Crystal structure and microwave dielectric properties of CaTiO3-(Li1/2Nd1/2) TiO3-(Ln1/3Nd1/3)TiO3 (Ln = La, Dy) ceramics

AU - Kim, Jeong Seog

AU - Cheon, Chae Il

AU - Kang, Hyun Joo

AU - Lee, Chang Hee

AU - Kim, Kyung Yong

AU - Nam, Sahn

AU - Byun, Jae Dong

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N2 - Crystal structure and microwave dielectric properties of a x-CaTiO3-y(Li1/2Nd1/2)TiO3-z(Ln 1/3Nd1/3)TiO3 (Ln = La, Dy) ternary system were studied. Crystal structures were refined by the Rietveld method using X-ray and neutron diffraction data. (Li1/2Nd1/2)TiO3 and 0.2CaTiO3-0.8(La1/3Nd1/3)TiO3 ceramics showed the most reliable R-values with a tetragonal structure with a space group P-4b2 and lattice constants of a = b ≈ 5.4 Å, and c ≈ 7.6 Å. The A-site cations were ordered along the c-axis. When x ≥ 0.3, the crystal structure changed to an orthorhombic CaTiO3 type. The xCaTiO3-y(Li1/2Nd1/2)TiO3-z(La 1/3Nd1/3)TiO3 system showed microwave dielectric properties of εr = 133, Q · f = 1,450 GHz and τf = -17ppm/°C at a composition of.Y = 0.2, y = 0.68, z = 0.12. In xCaTiO3-y(Li1/2Nd1/2)TiO3-z(Dy 1/3Nd1/3)TiO3, dielectric properties of εr, = 97.6, Q · f = 5, 150 GHz and τf = +0.4 ppm/°C were obtained at x = 0.30, y = 0.40, z = 0.30. The effect of each ternary system component on the dielectric properties is discussed.

AB - Crystal structure and microwave dielectric properties of a x-CaTiO3-y(Li1/2Nd1/2)TiO3-z(Ln 1/3Nd1/3)TiO3 (Ln = La, Dy) ternary system were studied. Crystal structures were refined by the Rietveld method using X-ray and neutron diffraction data. (Li1/2Nd1/2)TiO3 and 0.2CaTiO3-0.8(La1/3Nd1/3)TiO3 ceramics showed the most reliable R-values with a tetragonal structure with a space group P-4b2 and lattice constants of a = b ≈ 5.4 Å, and c ≈ 7.6 Å. The A-site cations were ordered along the c-axis. When x ≥ 0.3, the crystal structure changed to an orthorhombic CaTiO3 type. The xCaTiO3-y(Li1/2Nd1/2)TiO3-z(La 1/3Nd1/3)TiO3 system showed microwave dielectric properties of εr = 133, Q · f = 1,450 GHz and τf = -17ppm/°C at a composition of.Y = 0.2, y = 0.68, z = 0.12. In xCaTiO3-y(Li1/2Nd1/2)TiO3-z(Dy 1/3Nd1/3)TiO3, dielectric properties of εr, = 97.6, Q · f = 5, 150 GHz and τf = +0.4 ppm/°C were obtained at x = 0.30, y = 0.40, z = 0.30. The effect of each ternary system component on the dielectric properties is discussed.

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