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Please use this identifier to cite or link to this item: http://hdl.handle.net/2031/8809

Title: Preparation and piezoelectric properties of modified Ba(Zr0.06T0.94)O3–x(Ba0.91Ca0.09)TiO3 – origin of piezoelectricity: perspective from phase transition
Authors: Leong, Kit Long Ken (梁劼朗)
Department: Department of Physics and Materials Science
Issue Date: 2016
Course: AP4116 Dissertation
Programme: Bachelor of Engineering (Honours) in Materials Engineering
Supervisor: Dr. Xu, Z. K.
Citation: Leong, K. L. K. (2016). Preparation and piezoelectric properties of modified Ba(Zr0.06T0.94)O3–x(Ba0.91Ca0.09)TiO3 – origin of piezoelectricity: perspective from phase transition (Outstanding Academic Papers by Students (OAPS)). Retrieved from City University of Hong Kong, CityU Institutional Repository.
Abstract: Modified Ba(Zr0.06T0.94)O3–x(Ba0.91Ca0.09)TiO3 was prepared to investigate the relationship between phase transition and piezoelectricity. Phase diagrams, constructed by XRD patterns and temperature dependent dielectric constants, revealed that the first priority of quadruple point formation in BZT–BCT is the critical amount of zirconium. Maximum piezoelectric response (d33 = 262 pC/N and k = 0.379) was found at x = 10 near R–O transition. Compared to conventional Ba(Zr0.2T0.8)O3–x(Ba0.3Ca0.7)TiO3, modified system showed a smaller response and a divergence in the position of phase transition with maximum d33. Such scenario is related to the phase convergence zone that composition near O–T transition in modified system is out of the zone area. This suggested the critical role of phase transition and convergence in piezoelectricity.
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