Novel high Curie temperature Ba2ZnSi2O7 ferroelectrics with low-permittivity microwave dielectric properties. Issue 14 (1st November 2016)

• Record Type: Journal Article
• Authors: Zou, Zheng-Yu; Lan, Xue-Kai; Lu, Wen-Zhong; Fan, Gui-Fen; Wang, Xiao-Hong; Wang, Xiao-Chuan; Fu, Ping; Lei, Wen
• Is Part Of: Ceramics international. Volume 42:Issue 14(2016)
• Page Start: 16387
• Page End: 16391
• Publication Date: 2016-11-01
• Subjects: Melilite-related ceramics -- Ferroelectricity; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2016.07.040
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Ba2 ZnSi2 O7 ceramics with a monoclinic structure ( C 2/c ) were prepared using the conventional solid-state method at 1200 °C for 3 h in air. The as-prepared ceramics show signs of weak ferroelectricity from the P - E loop and ferroelectric domains with 90° and 103° directions. Although an ε r anomaly appears at approximately 510 °C, the Curie temperature ( T c ) of the Ba2 ZnSi2 O7 ceramics is 750 °C or higher. The ceramics also display low-permittivity microwave dielectric properties ( ε r =8.09, Q × f =26, 634 GHz, and τ f =−51.46 ppm/°C). Therefore, the coexistence of high- T c ferroelectricity and good microwave dielectric properties is beneficial to develop Ba2 ZnSi2 O7 ceramics into tunable-microwave and millimeter-wave devices such as capacitors, phase shifters, and oscillators.