Lattice structure analysis and optimised microwave dielectric properties of LiAl1-x(Zn0.5Si0.5)xO2 solid solutions. Issue 7 (July 2019)

• Record Type: Journal Article
• Authors: Lan, Xue-Kai; Li, Jie; Zou, Zheng-Yu; Fan, Gui-Fen; Lu, Wen-Zhong; Lei, Wen
• Is Part Of: Journal of the European Ceramic Society. Volume 39:Issue 7(2019)
• Page Start: 2360
• Page End: 2364
• Publication Date: 2019-07
• Subjects: LiAl1-x(Zn0.5Si0.5)xO2 ceramics -- Microwave dielectric ceramics -- Crystal structure -- Cation disorder; Ceramic materials -- Periodicals; Composite materials -- Periodicals; Matériaux céramiques -- Périodiques; Composites -- Périodiques; Ceramic materials; Composite materials; Periodicals; Electronic journals; 666.05
• DOI: 10.1016/j.jeurceramsoc.2019.02.011
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: Low-permittivity LiAl1- x (Zn0.5 Si0.5 ) x O2 microwave dielectric ceramics were prepared by the solid-state reaction method. Single-phase LiAlO2 solid solutions with a tetragonal structure were achieved at x ≤ 0.12. Partial substitution of [Zn0.5 Si0.5 ] 3+ for Al 3+ could improve the microstructure and prevent from absorbing moisture of pure LiAlO2 ceramics, which slightly increases their relative permittivity ( εr ). The quality factor ( Q × f ) and temperature coefficient of resonant frequency ( τf ) were closely related to the crystallinity and cation disorder of the B-site characterized by the full width at half-maximum of B1 (1) –mode assigned to Li–O–Al stretching. The optimum microwave dielectric properties ( εr = 6.12, Q × f = 56986 GHz and τf = -122 ppm/°C) were obtained in the sample with x = 0.02 sintered at 1300 °C.