Electrical properties of bismuth germanate (Bi2GeO5) ferroelectric glass-ceramics prepared by two different methods. Issue 195 (2nd January 2019)

• Record Type: Journal Article
• Authors: Panyata, Surapong; Eitssayeam, Sukum; Rujijanagul, Gobwute; Tunkasiri, Tawee; Munpakdee, Anocha; Pengpat, Kamonpan
• Is Part Of: Integrated ferroelectrics. Issue 195(2019)
• Page Start: 187
• Page End: 195
• Publication Date: 2019-01-02
• Subjects: Bismuth germanate -- ferroelectric glass-ceramics -- electrical properties; Ferroelectric devices -- Periodicals; Integrated circuits -- Periodicals; 537.244805
• DOI: 10.1080/10584587.2019.1570032
• Languages: English
• ISSNs: 1058-4587

Abstract

Abstract: Ferroelectric Bi2 GeO5 glass-ceramics were fabricated using conventional and incorporation method. Glasses have been prepared from BiO1.5 -GeO2 -BO1.5 ternary glass system by focusing on the region of 59 mol%BiO1.5 : 23 mol%GeO2 : 18 mol%BO1.5 . The resulting glass was analyzed by using differential thermal analysis (DTA) for determining the crystallization temperature ( T p ). Then, the prepared glass pieces were heat treated at Tp . Effects of different fabrication methods on structure and electrical of the glass-ceramics were investigated. X-ray diffraction result of all glass-ceramics suggested that the main peak of glass-ceramics matched the orthorhombic structure of the pure Bi2 GeO5 phase. Microstructures of the prepared glass-ceramics have been found to change from rod-like crystallites to bulk crystallites on modifying the fabrication method. The Bi2 GeO5 glass-ceramics prepared by incorporation method presented higher dielectric constant than those of the Bi2 GeO5 glass-ceramics prepared by conventional method. Moreover, the Bi2 GeO5 glass-ceramic prepared by incorporation method possesses a large value of P max (0.94 µC/cm 2 ) comparing to that of the glass-ceramics prepared by conventional method ( P max = 0.73 µC/cm 2 ). Thus, this study suggests that the incorporation method can effectively modify the microstructure of Bi2 GeO5 glass-ceramics, resulting in the improvement of dielectric and ferroelectric properties.