Cold sintered temperature stable xLi2MoO4-(1-x)(LiBi)0.5MoO4 microwave dielectric ceramics. Issue 4 (April 2023)

• Record Type: Journal Article
• Authors: Li, Xiaomeng; Xue, Xian; Lin, Qiyin; Qi, Zeming; Wang, Hong; Zhao, Yingying; Guo, Jing
• Is Part Of: Journal of the European Ceramic Society. Volume 43:Issue 4(2023)
• Page Start: 1477
• Page End: 1482
• Publication Date: 2023-04
• Subjects: Cold sintering process -- Microwave dielectric ceramics -- Temperature stable -- Infrared reflectivity -- Raman; 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.2022.11.065
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: Temperature stable xLi2 MoO4 -(1-x)(LiBi)0.5 MoO4 (x = 0, 40, 50, 60, 70, 100 vol%) microwave dielectric ceramics obtained by cold sintering process (CSP) under a mild sintering condition (120 ℃/30 min/200 MPa) are introduced in this work. The XRD, SEM, and Raman analysis indicate the coexistence of Li2 MoO4 and (LiBi)0.5 MoO4 phases. Li2 MoO4 -(LiBi)0.5 MoO4 ceramics are compatible with Ag and Al electrode materials under cold sintering condition. The specimens exhibit high relative densities and good microwave dielectric properties (relative permittivities: 31.5–5.5; Q×f values: 1900 - 18, 500 GHz; TCF values: from +144 ppm/℃ to −106 ppm/℃), in particular, TCF = +0.7 ppm/℃ can be obtained in the case of x = 50 vol%. The extrapolated microwave dielectric properties obtained by the fitted infrared reflectivity spectrum are close to the measured data, revealing that the dielectric responses of cold sintered Li2 MoO4 -(LiBi)0.5 MoO4 ceramics in the microwave range are dominated by the polar optical phonons.