Microwave dielectric properties of LiSmTa4O12 ceramics with A-site deficient perovskite structure

• Published in: Materials letters 2020-09, Vol.274, p.128020, Article 128020
• Main Authors: Wang, Kangguo, Zhou, Huanfu, Luan, Xiaowen, Hu, Sang, Zhou, Xianjie, Deng, Jiji, Li, Shixuan
• Format: Article
• Language: English
• Subjects: Ceramics; Dielectric properties; Dielectric strength; Dielectrics; Electronic devices; Materials science; Perovskite structure; Perovskites; X-ray techniques
• ISSN: 0167-577X; 1873-4979
• DOI: 10.1016/j.matlet.2020.128020

•LiSmTa4O12 ceramics displayed A-site deficient perovskite structure which is similar to La1/3TaO3.•LiSmTa4O12 ceramics exhibited a high relative permittivity and good microwave dielectric properties.•The high relative permittivity makes LiSmTa4O12 ceramics suitable for small communication devices. LiSmTa4O12 ceramics were prepared via the conventional solid-state method, and their microwave dielectric properties were studied. The ceramics could be densified at 1425 °C–1525 °C. X-ray diffraction (XRD) analysis suggested that LiSmTa4O12 is single phase with A-site deficient perovskite structure a, whereas the impact from sintering temperature is weak. The excellent microwave dielectric performances of εr = 59.60, Q × f = 7 760 GHz (at 5.065 GHz), and τf = +41.8 ppm/°C were achieved when the ceramics were sintered at 1500 °C for 4 h, which means that the ceramics are suitable for miniaturized electronic devices.