TY - JOUR
T1 - Phase transition behavior and high piezoelectric properties in lead-free BaTiO3-CaTiO3-BaHfO3 ceramics
AU - Wang, Dali
AU - Jiang, Zhaohua
AU - Yang, Bin
AU - Zhang, Shantao
AU - Zhang, Mingfu
AU - Guo, Feifei
AU - Cao, Wenwu
N1 - Funding Information:
Acknowledgements This work was supported by the National key Basic Research Program of China (973 Program, 2013CB632900), the Key Technologies R&D Program of China under Grant No. 2013BAI03B06, and the National Nature Science Foundation of China (10704021, 51102062, and 11174127).
PY - 2014/1
Y1 - 2014/1
N2 - The transition behavior, structural changes, and electric properties of lead-free (1-x)Ba(Hf0.16Ti0.84)O3 -x(Ba 0.70Ca0.30)TiO3 (BCHT) ceramics fabricated by the conventional solid-state reaction method are investigated in this study. A complete phase diagram of BCHT system has been proposed based on their dielectric behavior. It is found that BHCT ceramics undergo a complicated phase evolution, driven by Ca and Hf contents. The results clearly demonstrate that high electric properties are achieved in the ferroelectric orthorhombic- tetragonal phase boundary near the composition with x = 0.48, which could be adjusted by the contents of Ca and Hf in the composition. The optimum composition shows enhanced properties with dielectric constant ε r = 2889 (at room temperature, 1 kHz), high piezoelectric coefficient d33 = 410 pC/N, and electromechanical coupling factor kp = 0.47, and a relative high Curie temperature of 106 °C. This investigation yields a sight to understand different phase transition mechanisms of enhanced piezoelectricity for the system.
AB - The transition behavior, structural changes, and electric properties of lead-free (1-x)Ba(Hf0.16Ti0.84)O3 -x(Ba 0.70Ca0.30)TiO3 (BCHT) ceramics fabricated by the conventional solid-state reaction method are investigated in this study. A complete phase diagram of BCHT system has been proposed based on their dielectric behavior. It is found that BHCT ceramics undergo a complicated phase evolution, driven by Ca and Hf contents. The results clearly demonstrate that high electric properties are achieved in the ferroelectric orthorhombic- tetragonal phase boundary near the composition with x = 0.48, which could be adjusted by the contents of Ca and Hf in the composition. The optimum composition shows enhanced properties with dielectric constant ε r = 2889 (at room temperature, 1 kHz), high piezoelectric coefficient d33 = 410 pC/N, and electromechanical coupling factor kp = 0.47, and a relative high Curie temperature of 106 °C. This investigation yields a sight to understand different phase transition mechanisms of enhanced piezoelectricity for the system.
UR - http://www.scopus.com/inward/record.url?scp=84891345258&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84891345258&partnerID=8YFLogxK
U2 - 10.1007/s10853-013-7650-9
DO - 10.1007/s10853-013-7650-9
M3 - Article
AN - SCOPUS:84891345258
SN - 0022-2461
VL - 49
SP - 62
EP - 69
JO - Journal of Materials Science
JF - Journal of Materials Science
IS - 1
ER -