A novel low-firing microwave dielectric ceramic NaMg4V3O12 and its chemical compatibility with silver electrode. Issue 10 (December 2015)

• Record Type: Journal Article
• Authors: Jiang, Xuewen; Fang, Liang; Xiang, Huaicheng; Guo, Huanhuan; Li, Jie; Li, Chunchun
• Is Part Of: Ceramics international. Volume 41:Issue 10(2015)Part A
• Page Start: 13878
• Page End: 13882
• Publication Date: 2015-12
• Subjects: C. Dielectric properties -- LTCC -- Vanadate -- NaMg4V3O12; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2015.07.107
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: A tetragonal vanadate ceramic NaMg4 V3 O12 was fabricated and its microwave dielectric properties were investigated. NaMg4 V3 O12 ceramics could be well densified at 690 °C and exhibited favorable microwave dielectric properties with a low relative permittivity ( ε r ) ~12.5, a high quality factor ( Q u ×f ) value ~35, 900 GHz ( f =10.5 GHz) and a negative temperature coefficient of resonant frequency ( τ f )~−58.1 ppm/°C. NaMg4 V3 O12 ceramic was found to be chemically compatible with Ag when sintered at 690 °C for 4 h. The large negative τ f value of NaMg4 V3 O12 could be tuned by adding CaTiO3, and 0.92NaMg4 V3 O12 –0.08CaTiO3 ceramic sintered at 730 °C for 4 h exhibited a near zero τ f ~−3.8 ppm/°C with ε r ~24.3, Q u ×f ~ 29, 200 GHz. The results suggest it a promising ceramic for low temperature co-fired ceramic (LTCC) applications as substrate in microwave integrated circuits.