Temperature stable (1-x)(0.9Na0.5Bi0.5TiO3-0.1BiAlO3)-xNaTaO3 ceramics and capacitors with ultra-wide operational range

• Published in: Journal of alloys and compounds 2021-12, Vol.886, p.161315, Article 161315
• Main Authors: Zhao, Han, Ren, Pengrong, Hua, Qian, Liu, Laijun, Wang, Xin, Wan, Yuhui, Yan, Fuxue, Zhao, Gaoyang, Wang, Dawei
• Format: Article
• Language: English
• Subjects: Capacitors; Ceramics; Die casting; Dielectric; Dielectric loss; Dielectric properties; Electronic equipment; Energy storage; Multilayer ceramic capacitors; Multilayers; Na0.5Bi0.5TiO3; Permittivity; Tape casting; Temperature stability
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2021.161315

•NBT-10BA-25NT with operational temperature range of −100–334 °C is obtained.•NBT-10BA-25NT based MLCCs were fabricated by tape-casting method.•The MLCC has an ultra-wide operational temperature range (−100–392 °C). Temperature stable multilayer ceramic capacitors (MLCCs) are urgently required for electronic equipment applications. In this work, NaTaO3 modified (1-x)(0.9Na0.5Bi0.5TiO3-0.1BiAlO3) ceramics (NBT-10BA-100xNT) were designed and fabricated. The effects of NaTaO3 concentration on the dielectric properties, insulating properties, and energy storage properties were investigated. At the optimum composition of x = 0.25, stable permittivity (Δε′/ε25°C′≤±15%) and low dielectric loss (tanδ≤ 0.02) over a wide temperature range of −100–334 °C were achieved. Furthermore, NBT-10BA-25NT based MLCCs with 70Ag/30 Pd inner electrodes were successfully fabricated by tape-casting method, which also exhibited both stable permittivity (Δε′/ε25°C′≤±15%) and low dielectric loss (tanδ ≤ 0.02) in an ultra-wide temperature range (−100–398 °C). These excellent performances suggest that NBT-10BA-25NT could be a promising candidate of dielectrics with ultra-wide operational temperature range for MLCCs.