TY - JOUR
T1 - Phase transition, microstructure and electrical properties of Fe doped Ba0.70Ca0.30TiO3 lead-free piezoelectric ceramics
AU - Li, Cai Xia
AU - Yang, Bin
AU - Zhang, Shan Tao
AU - Zhang, Rui
AU - Sun, Ye
AU - Wang, Jun Jun
AU - Wang, Rui Xue
AU - Cao, Wen Wu
N1 - Funding Information:
This work was supported by the Key Technologies R&D Program of China under (Grant no. 2013BAI03B06 ), the National Science and Technology Support Program ( SQ2012BAJY3766 ), the National Key Basic Research Program of China (973 Program, 2013CB632900 ), the National Nature Science Foundation of China ( 10704021 , 51102062 , and 11174127 ), and the Key Scientific and Technological Project of Harbin (Grant no. 2009AA3BS131 ).
PY - 2013/12
Y1 - 2013/12
N2 - Lead-free piezoelectric ceramics of Ba0.70Ca 0.30Ti1-xFexO3 (x=0-0.03) have been synthesized by a conventional solid state reaction method. The influence of Fe content on the microstructure, phase transition, dielectric, ferroelectric, and piezoelectric properties is investigated systematically. The ceramics with x≤0.02 are diphasic composites of tetragonal Ba0.80Ca 0.20TiO3:Fe and orthorhombic Ba0.07Ca 0.93TiO3:Fe solid solutions. The tetragonal phase is gradually suppressed as x increases, the ceramic with x=0.03 is found to have diphasic pseudocubic and orthorhombic phases. And the grain size is dependent on Fe content significantly. Introduction of Fe at B-sites improves the densification and decreases the sintering temperature. As x increases from 0 to 0.03, the room temperature relative dielectric permittivity enhances, dielectric loss decreases, and the Curie temperature decreases monotonically from 128 C to 58 C. However, the ferroelectricity enhances slightly and reaches the maximum near x=0.005, and then weakens with increasing x. On the other hand, the piezoelectric coefficient (d33) and the electromechanical coupling coefficient (kp) decrease simultaneously with increasing x, whereas the mechanical quality factor (Qm) increases significantly. The structure-electrical properties relationship is discussed intensively to give more information on (Ba,Ca)TiO3-based lead-free piezoelectric ceramics.
AB - Lead-free piezoelectric ceramics of Ba0.70Ca 0.30Ti1-xFexO3 (x=0-0.03) have been synthesized by a conventional solid state reaction method. The influence of Fe content on the microstructure, phase transition, dielectric, ferroelectric, and piezoelectric properties is investigated systematically. The ceramics with x≤0.02 are diphasic composites of tetragonal Ba0.80Ca 0.20TiO3:Fe and orthorhombic Ba0.07Ca 0.93TiO3:Fe solid solutions. The tetragonal phase is gradually suppressed as x increases, the ceramic with x=0.03 is found to have diphasic pseudocubic and orthorhombic phases. And the grain size is dependent on Fe content significantly. Introduction of Fe at B-sites improves the densification and decreases the sintering temperature. As x increases from 0 to 0.03, the room temperature relative dielectric permittivity enhances, dielectric loss decreases, and the Curie temperature decreases monotonically from 128 C to 58 C. However, the ferroelectricity enhances slightly and reaches the maximum near x=0.005, and then weakens with increasing x. On the other hand, the piezoelectric coefficient (d33) and the electromechanical coupling coefficient (kp) decrease simultaneously with increasing x, whereas the mechanical quality factor (Qm) increases significantly. The structure-electrical properties relationship is discussed intensively to give more information on (Ba,Ca)TiO3-based lead-free piezoelectric ceramics.
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U2 - 10.1016/j.ceramint.2013.04.052
DO - 10.1016/j.ceramint.2013.04.052
M3 - Article
AN - SCOPUS:84883766468
SN - 0272-8842
VL - 39
SP - 8701
EP - 8708
JO - Ceramics International
JF - Ceramics International
IS - 8
ER -