A low-firing Ca5Ni4(VO4)6 ceramic with tunable microwave dielectric properties and chemical compatibility with Ag. Issue 13 (October 2016)

• Record Type: Journal Article
• Authors: Wang, Dan; Xiang, Huaicheng; Tang, Ying; Fang, Liang; Khaliq, Jibran; Li, Chunchun
• Is Part Of: Ceramics international. Volume 42:Issue 13(2016)
• Page Start: 15094
• Page End: 15098
• Publication Date: 2016-10
• Subjects: Microwave dielectric properties -- Garnet structure -- LTCC -- Vanadate; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2016.06.085
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: A Ca5 Ni4 (VO4 )6 low loss microwave dielectric ceramic with A site deficient garnet structure was prepared via the conventional solid state reaction method. Ca5 Ni4 (VO4 )6 sintered at 980 °C for 4 h to a relative density of 96.2% exhibits favorable microwave dielectric properties such as a permittivity of 10.9, a Q×f value of 96, 500 GHz, and a τ f value of −63.6 ppm/°C. Its large negative τ f could be compensated by forming a solid solution with LiCa2 Mg2 V3 O12, that led to improved properties with a near-zero τ f =−3.7 ppm/°C, ε r =10.2, Q × f =59, 300 GHz for 0.8Ca5 Ni4 (VO4 )6 −0.2LiCa2 Mg2 V3 O12 after sintering at 955 °C for 4 h. Further on, 0.8Ca5 Ni4 (VO4 )6 −0.2LiCa2 Mg2 V3 O12 proved to be chemically compatible with Ag electrodes, so it might be a possible candidate for LTCC applications.