The Enhanced Thermal Stability of [sub.2]TiO[sub.4] Dielectric Ceramics Modified by a Multi-Phase Method

• Published in: Materials 2023-04, Vol.16 (8)
• Main Authors: Shen, Chun-Hsu, Shen, Ting-Wei, Hsieh, Tsai-Yu, Lan, Kai-Chun, Hsu, Shen-Hsien, Wang, Ching-Hsuan, Lin, Yu-Ting, Wu, Wen-Fang, Tseng, Zong-Liang
• Format: Article
• Language: English
• Subjects: Ceramic materials; Ceramics; Electric waves; Electromagnetic radiation; Electromagnetic waves; Methods
• ISSN: 1996-1944; 1996-1944
• DOI: 10.3390/ma16082997

The thermal stability of (Mg[sub.0.95]Ni[sub.0.05])[sub.2]TiO[sub.4] dielectric ceramics has been improved by mixing with CaTiO[sub.3] phases owing to higher positive temperature coefficients. The pure (Mg[sub.0.95]Ni[sub.0.05])[sub.2]TiO[sub.4] and the mixture phase systems of CaTiO[sub.3]-modified (Mg[sub.0.95]Ni[sub.0.05])[sub.2]TiO[sub.4] were verified by XRD diffraction patterns to ensure the crystallite of different phases. The microstructures of the CaTiO[sub.3]-modified (Mg[sub.0.95]Ni[sub.0.05])[sub.2]TiO[sub.4] were observed by SEM and EDS to investigate the relation between element ratios and grains. As a result, it can be seen that the thermal stability of the CaTiO[sub.3]-modified (Mg[sub.0.95]Ni[sub.0.05])[sub.2]TiO[sub.4] can be effectively enhanced, compared with the pure (Mg[sub.0.95]Ni[sub.0.05])[sub.2]TiO[sub.4]. Moreover, the radio frequency dielectric performances of CaTiO[sub.3]-modified (Mg[sub.0.95]Ni[sub.0.05])[sub.2]TiO[sub.4] dielectric ceramics are strongly dependent upon the density and the morphology of the specimens. The champion sample with the ratio of (Mg[sub.0.95]Ni[sub.0.05])[sub.2]TiO[sub.4] and CaTiO[sub.3] of 0.92:0.08 showed an ε[sub.r] value of 19.2, an Qf value of 108,200 GHz, and a τf value of −4.8 ppm/°C, which may encourage (Mg[sub.0.95]Ni[sub.0.05])[sub.2]TiO[sub.4] ceramics to broaden the range of novel applications and match the requirements of 5G or next-generation communication systems.