Li5Ti2O6F: a new low-loss oxyfluoride microwave dielectric ceramic for LTCC applications

• Published in: Journal of materials science 2020-01, Vol.55 (1), p.107-115
• Main Authors: Zhang, Zhiwei, Tang, Ying, Xiang, Huaicheng, Yang, Aihong, Wang, Yu, Yin, Changzhi, Tian, Yunfei, Fang, Liang
• Format: Article
• Language: English
• Subjects: Aluminum; Ceramics; Characterization and Evaluation of Materials; Chemical compatibility; Chemistry and Materials Science; Classical Mechanics; Crystallography and Scattering Methods; Dielectric properties; Electronic devices; Halites; Infrared radiation; Materials Science; Organic chemistry; Oxyfluorides; Polymer Sciences; Silver; Solid Mechanics
• ISSN: 0022-2461; 1573-4803
• DOI: 10.1007/s10853-019-04031-4

Use of microwave dielectric ceramics can significantly promote the development of communication devices. The primary criteria for determining their applications are excellent microwave dielectric properties and suitability for co-firing with cheap metals (e.g., Ag, Al). This study first reports the low-temperature synthesis of Li 5 Ti 2 O 6 F with a cubic rock salt structure. Li 5 Ti 2 O 6 F was prepared at 880 °C and had ε r of 19.6, Q  ×  f of 79500 GHz, and τ f of − 29.6 ppm/ °C. The infrared reflectivity spectrum revealed that the dielectric contribution of Li 5 Ti 2 O 6 F in the microwave range was mainly affected by phonon absorption. Experimental study indicated that Li 5 Ti 2 O 6 F had good chemical compatibility versus Ag electrode at 880 °C for 2 h. Given these characteristics, Li 5 Ti 2 O 6 F ceramics exhibited potential for low-temperature co-fired ceramic technology.