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You searched for subject:(BCTZ). Showing records 1 – 2 of 2 total matches.

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University of New South Wales

1. Zhang, Yichi. The piezoelectric and fatigue behaviour of lead-free BCTZ material.

Degree: Materials Science & Engineering, 2015, University of New South Wales

Due to the toxicity of lead, there is a demand for lead-free alternatives to PZT that not only have comparable piezoelectric performance but also reliability during long-term application. Due to a high piezoelectric coefficient, BCTZ piezoelectric ceramics have been considered as a promising lead-free alternate piezoelectric material at room temperature range. However, the BCTZ system has not been fully understood and only limited compositions in the system have been synthesised and investigated in the literature. In this thesis seven specifically selected compositions in the BCTZ system are investigated including six new compositions that have not been previously reported. All six compositions have phase coexistence at room temperature and exhibit high piezoelectric performance. It is found that the phase coexisting temperature can be predicted for each composition, which enables the selection of high performance compositions for different working temperature.For investigation of ageing behaviour, samples were left at poled state up to 36 days and showed a shift of the hysteresis loop along the field direction and development of asymmetry in strain and permittivity hysteresis loop over time. The origin of this ageing behaviour is proposed as the local defect dipoles and the migration of the charged defects to the grain boundaries. The stability of the piezoelectric performance during both unipolar and bipolar cycling is investigated. For unipolar cycling, samples were cycled at 10Hz up to 5x106 cycles. Development of a bias field, offset polarization, and asymmetry in strain and dielectric hysteresis loops are observed during bipolar measurements. These changes are mainly attributed to the migration of charged carriers driven by the unscreened depolarization field at grain boundaries. For bipolar cycling, two compositions with different Ca and Zr doping were cycled at 10 Hz up to approximately 107 cycles. Both investigated compositions exhibited high bipolar fatigue resistance compared to other ceramics reported in the literatures. The high fatigue resistance is originated from the lack of mechanical damage and a weak domain wall pinning effect due to their location in the phase transition region. It was also found that the pore morphology affected the bipolar fatigue behaviour. Advisors/Committee Members: Hoffman, Mark, Materials Science & Engineering, Faculty of Science, UNSW, Glaum, Julia, Materials Science & Engineering, Faculty of Science, UNSW.

Subjects/Keywords: fatigue; BCTZ; piezoelectric; ageing

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Zhang, Y. (2015). The piezoelectric and fatigue behaviour of lead-free BCTZ material. (Doctoral Dissertation). University of New South Wales. Retrieved from http://handle.unsw.edu.au/1959.4/54935 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:36216/SOURCE02?view=true

Chicago Manual of Style (16th Edition):

Zhang, Yichi. “The piezoelectric and fatigue behaviour of lead-free BCTZ material.” 2015. Doctoral Dissertation, University of New South Wales. Accessed July 17, 2019. http://handle.unsw.edu.au/1959.4/54935 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:36216/SOURCE02?view=true.

MLA Handbook (7th Edition):

Zhang, Yichi. “The piezoelectric and fatigue behaviour of lead-free BCTZ material.” 2015. Web. 17 Jul 2019.

Vancouver:

Zhang Y. The piezoelectric and fatigue behaviour of lead-free BCTZ material. [Internet] [Doctoral dissertation]. University of New South Wales; 2015. [cited 2019 Jul 17]. Available from: http://handle.unsw.edu.au/1959.4/54935 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:36216/SOURCE02?view=true.

Council of Science Editors:

Zhang Y. The piezoelectric and fatigue behaviour of lead-free BCTZ material. [Doctoral Dissertation]. University of New South Wales; 2015. Available from: http://handle.unsw.edu.au/1959.4/54935 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:36216/SOURCE02?view=true


Brno University of Technology

2. Vacek, Petr. Sol-gel syntéza a vlastnosti nanočástic piezokeramických materiálů na bázi(BaxCa1-x)(TiyZr1-y)O3 .

Degree: 2014, Brno University of Technology

Tématem práce byla sol-gel syntéza nanočástic piezokeramiky na bázi BaxCa1-xTiyZr1-yO3 (BCTZ), příprava slinutých vzorků a analýza jejich struktury a vlastností. V teoretické části byly shrnuty poznatky o piezoelektrických vlastnostech keramických materiálů a jejich přípravě. V experimentální části byla popsána sol-gel syntéza nanočástic BCTZ, u kterých bylo hodnoceno fázové složení a velikost částic. Dále bylo popsáno lisování a slinování BCTZ vzorků a studium jejich vlastností.; The aim of the work was sol-gel synthesis of piezoceramic nanoparticles on the base of BaxCa1-xTiyZr1-yO3 (BCTZ), preparation of sintered samples and analysis of their structure and properties. Theoretical part includes information about piezoelectricity, piezoelectric materials and preparation of ceramics. Experimental part describes sol-gel synthesis of BCTZ nanoparticles and achieved phase composition and particle size. The next topic of experimental part was preparation of sintered BCTZ samples and analysis of their properties. Advisors/Committee Members: Cihlář, Jaroslav (advisor).

Subjects/Keywords: Piezoelektrické materiály; keramika; sol-gel syntéza; BaxCa1-xTiyZr1-yO3 (BCTZ); Piezoelectric materials; ceramics; sol-gel synthesis; BaxCa1-xTiyZr1-yO3 (BCTZ)

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Vacek, P. (2014). Sol-gel syntéza a vlastnosti nanočástic piezokeramických materiálů na bázi(BaxCa1-x)(TiyZr1-y)O3 . (Thesis). Brno University of Technology. Retrieved from http://hdl.handle.net/11012/32795

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Vacek, Petr. “Sol-gel syntéza a vlastnosti nanočástic piezokeramických materiálů na bázi(BaxCa1-x)(TiyZr1-y)O3 .” 2014. Thesis, Brno University of Technology. Accessed July 17, 2019. http://hdl.handle.net/11012/32795.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Vacek, Petr. “Sol-gel syntéza a vlastnosti nanočástic piezokeramických materiálů na bázi(BaxCa1-x)(TiyZr1-y)O3 .” 2014. Web. 17 Jul 2019.

Vancouver:

Vacek P. Sol-gel syntéza a vlastnosti nanočástic piezokeramických materiálů na bázi(BaxCa1-x)(TiyZr1-y)O3 . [Internet] [Thesis]. Brno University of Technology; 2014. [cited 2019 Jul 17]. Available from: http://hdl.handle.net/11012/32795.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Vacek P. Sol-gel syntéza a vlastnosti nanočástic piezokeramických materiálů na bázi(BaxCa1-x)(TiyZr1-y)O3 . [Thesis]. Brno University of Technology; 2014. Available from: http://hdl.handle.net/11012/32795

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

.