Effects of oxygen partial pressure on the electrical properties and phase transitions in (Ba,Ca)(Ti,Zr)O3 ceramics

To enhance the piezoelectric responses, Ba 0.85 Ca 0.15 Zr 0.1 Ti 0.9 O 3 (BCZT) ceramics were fabricated by a sol–gel method in various sintering atmospheres. The effects of oxygen partial pressure on the microstructure and electrical properties of BCZT ceramics were systematically investigated. Th...

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Bibliographic Details
Published in:Journal of materials science 2020-08, Vol.55 (23), p.9972-9992
Main Authors: Cai, Wei, Zhang, Qianwei, Zhou, Chuang, Gao, Rongli, Wang, Fengqi, Chen, Gang, Deng, Xiaoling, Wang, Zhenhua, Deng, Nengyun, Cheng, Li, Fu, Chunlin
Format: Article
Language:English
Subjects:
Atmospheric pressure
Ceramics
Characterization and Evaluation of Materials
Chemistry and Materials Science
Classical Mechanics
Crystallography and Scattering Methods
Electrical properties
Ferroelectricity
Materials Science
Microstructure
Oxygen
Partial pressure
Phase transitions
Piezoelectricity
Polymer Sciences
Pressure effects
Room temperature
Sintering
Sol-gel processes
Solid Mechanics
Transition temperature
Zirconium
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Summary:To enhance the piezoelectric responses, Ba 0.85 Ca 0.15 Zr 0.1 Ti 0.9 O 3 (BCZT) ceramics were fabricated by a sol–gel method in various sintering atmospheres. The effects of oxygen partial pressure on the microstructure and electrical properties of BCZT ceramics were systematically investigated. The samples sintered in air, O 2 and N 2 are the coexistence of the orthorhombic (O)-tetragonal (T) phase at room temperature. The phase transition temperature of the O–T phase of BCZT samples sintered in air, O 2 and N 2 is gradually closer to room temperature. The results of EDS, XPS and the activation energy confirm the significant effect of oxygen sintering atmosphere. BCZT samples sintered in oxygen atmosphere show excellent ferroelectricity (2 P r  = 31.62 μC/cm 2 , 2 E C  = 3.46 kV/cm) and significantly enhanced piezoelectricity ( d 33  = 604.3 pC/N, d 33 *  = 647.5 pm/V and k p  = 58%), resulting from the minimum oxygen vacancy, the phase transition temperature of O–T closer to room temperature and dense microstructure. These results demonstrate that adjusting oxygen partial pressure in sintering is an effective way to enhance the piezoelectric responses of BCZT ceramics.
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-020-04771-8