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

1.
School of Mechanical and Electrical Engineering, Chengdu University of Technology, Chengdu 610059, China
2.
State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, China

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

Figures(6)

Mg_{1 -x}Cu_x 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 Mg_{1 -x}Cu_xTiO₃ 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 Mg_1-xCu _xTiO₃ ceramics would deteriorate the Qf value of the sample. The dielectric constants (ε_r) of samples were related to the ionic polarizability, impurity phase, and TiO₆ octahedra distortion. The temperature coefficients of resonant frequency (τ_f) decreased with the increase of TiO₆ octahedra distortion. When x= 0.08, the sample could achieve densification sintering at 1 150 ℃ and the τ_f value was improved to -3.4×10^-5 ℃^-1.
- microwave dielectric ceramic,
- structure,
- dielectric properties
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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

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

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通讯作者: 陈斌, bchen63@163.com

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