| Sol-Gel Synthesis and Characterization of
(1–x–y)BiYbO3-xLiNbO3-yBaTiO3 Ceramics |
Gang Chen,1, 2, * Chunyan Deng,2 Xiaodong Peng,1 Chunlin Fu,2 Wei Cai,2
Rongli Gao2 and Xiaoling Deng1, 2
pages: 220-224>
DOI : 10.1080/0371750X.2016.1229636 |
| Abstract |
| (1–x–y)BiYbO3-xLiNbO3-yBaTiO3 (short form (1–x–y)BY-xLN-yBT) (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 800oC for 4 h and then sintered at
1200oC 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 Yb2Ti2O7 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 C.cm–2) and
Ec (956.2 V.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.
[Keywords: BiYbO3-LiNbO3-BaTiO3 ceramics, Sol-gel method, Crystal structure,
Surface morphology, Electric properties] |
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