A novel tungstate Li3Nd3W2O12 with garnet structure for low-temperature cofired ceramic technology. Issue 4 (April 2020)

• Record Type: Journal Article
• Authors: Tang, Ying; Yu, Mingyang; Zhang, Zhiwei; Chen, Junqi; Xiang, Huaicheng; Xing, Xianran; Fang, Liang
• Is Part Of: Journal of the European Ceramic Society. Volume 40:Issue 4(2020)
• Page Start: 1386
• Page End: 1389
• Publication Date: 2020-04
• Subjects: Tungstate -- Garnet structure -- LTCC -- Microwave dielectric properties; 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.2019.11.083
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: Microwave dielectrics sintered at low temperature are pursued for energy saving and cofiring with cost-effective metallic electrodes (e.g. Cu, Ag and Al). In this study, a novel tungstate low-firing microwave dielectric ceramic, Li3Nd3W2O12, which can realise co-firing with Ag electrode at 940 °C, was synthesised by the conventional solid-state reaction method. According to the X-ray diffraction and Rietveld refinement results, Li3Nd3W2O12 crystallised in the garnet structure with a space group of Ia 3 ¯ d and W 6+ cations fully occupying the octahedral-coordinated site. The optimum microwave dielectric properties with permittivity of ∼9.8, quality factor of ∼36, 800 GHz and temperature coefficient of resonant frequency of ∼ –30 ppm/°C were obtained after sintered at 940 °C. A near-zero temperature coefficient of resonant frequency of +3.6 ppm/°C was achieved in 0.96Li3Nd3W2O12-0.04CaTiO3 ceramics. These properties make tungstate Li3Nd3W2O12 a promising candidate for low-temperature co-fired ceramic technology.