Sol-Gel Synthesis and Characterization of (1–x–y)BiYbO3-xLiNbO3-yBaTiO3 Ceramics. Issue 4 (1st October 2016)

• Record Type: Journal Article
• Authors: Chen, Gang; Deng, Chunyan; Peng, Xiaodong; Fu, Chunlin; Cai, Wei; Gao, Rongli; Deng, Xiaoling
• Is Part Of: Transactions of the Indian Ceramic Society. Volume 75:Issue 4(2016)
• Page Start: 220
• Page End: 224
• Publication Date: 2016-10-01
• Subjects: BiYbO3-LiNbO3-BaTiO3 ceramics -- Sol-gel method -- Crystal structure -- Surface morphology -- Electric properties; Pottery -- India -- Periodicals; 666.306254
• DOI: 10.1080/0371750X.2016.1229636
• Languages: English
• ISSNs: 0371-750X

Abstract

ABSTRACT: (1– x – y )BiYbO3- x LiNbO3- y BaTiO3 (short form (1– x – y )BY- x LN- y BT) ( x =0.1, 0.2, 0.3; y =0.8, 0.7, 0.6, 0.5, corresponding to BY-1LN-8BT, BY-2LN-7BT, BY-1LN-7BT, BY-2LN-6BT, and BY-3LN-5BT) lead-free ferroelectric ceramics were synthesized by sol-gel method. All of BY-LN-BT ceramics were firstly calcined at 800°C for 4 h and then sintered at 1200°C for 2 h. The microstructure, dielectric and ferroelectric properties of the samples were investigated. X-ray diffraction revealed that all the calcined BY-LN-BT powders are of pure single-phase rhombohedral structure. The main phase of all ceramic samples is perovskite structure, and Yb2 Ti2 O7 pyrochlore phase as the second phase coexists in BY-LN-BT ceramics except for BY-1LN-8BT. The relative densities of BY-LN-BT ceramics decrease with increasing LN content. All ceramic samples consist of well-faceted polyhedral grains, which show non-uniform shape, size and relative compactness. Addition of BT can increase the dielectric constant and promote frequency stability of dielectric properties. The highest relative permittivity is 4480 for BY-1LN- 8BT. The remnant polarization ( Pr ) and the coercive field ( Ec ) of BY-LN-BT ceramics decrease with decreasing frequency. The maximum values of Pr (1.706 μC.cm –2 ) and Ec (956.2V.mm –1 ) are obtained for BY-3LN-5BT, but its leakage current is very high. The best comprehensive electrical properties are obtained for BY-1LN-8BT ceramics. GRAPHICAL ABSTRACT: