Citation: Xi-Zhi YANG, Fan YANG, Yuan-Ming LAI, Bao-Yang LI, Fan-Shuo WANG, Hua SU. Effect of Cu2+ Ion A-Site Substitution on Structure and Dielectric Properties of MgTiO3 Ceramics[J]. Chinese Journal of Inorganic Chemistry, ;2022, 38(4): 599-610. doi: 10.11862/CJIC.2022.066 shu

Effect of Cu2+ Ion A-Site Substitution on Structure and Dielectric Properties of MgTiO3 Ceramics

  • Corresponding author: Yuan-Ming LAI, laiyuanming19@cdut.edu.cn
  • Received Date: 12 October 2021
    Revised Date: 10 February 2022

Figures(6)

  • Mg1 -xCux TiO3 (0.00 ≤ x ≤ 0.20) microwave ceramics were prepared by the solid - state reaction method. The effects of CuO sintering aids on the microstructure and microwave dielectric properties of MgTiO3 ceramics were investigated. It was shown that the Cu2+ ions could enter the MgTiO3 lattice and substitute Mg2+ ions forming Mg1 -xCuxTiO3 solid solution. A moderate amount of CuO can promote the densification sintering of MgTiO3 ceramics and reduce the sintering temperature due to the liquid phase. The A-site substitution of Cu2+ ions alters the distortion of the TiO6 octahedra. With the increase of Cu2+ ions content in MgTiO3 ceramics, the structural stability was weakened. With the addition of CuO content, the quality factor (Qf) of the sample decreased owing to inhomogeneous grain growth and the appearance of the liquid phase. Meanwhile, the reduction of relative density, structural stability, and average covalency of Mg1-xCu xTiO3 ceramics would deteriorate the Qf value of the sample. The dielectric constants (εr) of samples were related to the ionic polarizability, impurity phase, and TiO6 octahedra distortion. The temperature coefficients of resonant frequency (τf) decreased with the increase of TiO6 octahedra distortion. When x= 0.08, the sample could achieve densification sintering at 1 150 ℃ and the τf value was improved to -3.4×10-5-1.
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