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

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45 Citations (Scopus)

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 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.

Original languageEnglish
Pages (from-to)5633-5637
Number of pages5
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume38
Issue number9 B
DOIs
Publication statusPublished - 1999
Externally publishedYes

Keywords

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

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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