期刊
JOURNAL OF MATERIALS CHEMISTRY C
卷 1, 期 3, 页码 522-530出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2tc00020b
关键词
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资金
- National Basic Research Program of China [2012CB619401]
- Key Program of the National Natural Science Foundation of China [11134004]
- Natural Science Foundation of China [51002029]
- Doctoral Fund of Ministry of Education of China [20100092120039]
- Opening project for the State Key Laboratory of Crystal Materials, Shandong University, P. R. China [KF1107]
A lead-free piezoelectric material with ultra-high properties, Ba(Ti0.8Zr0.2)O3-x(Ba0.7Ca0.3)TiO3(BZT-xBCT) nanocrystals was synthesized via a sol-gel method, and the corresponding thin films were also deposited on Pt/Ti/SiO2/Si substrates by a spin-coating approach. The BZT-xBCT thin film exhibited a high remnant polarization of 22.15 mu C cm(-2) with a large coercive field of 68.06 kV cm(-1). The resultant gel is calcined at various elevated temperatures and studied with FTIR/XRD/Raman/DSC-TGA/AFM/SEM techniques for gel composition, crystallization, phase transition, thermochemistry and the morphology of the film. Although the room temperature crystal structure of the BZT-xBCT nanocrystals appears to be a standard perovskite structure by conventional X-ray diffraction (XRD), Raman spectroscopy demonstrates the presence of non-centrosymmetric regions arising from the off-centering of the titanium (zirconium) atoms. The Raman spectra findings demonstrate the degree by which the tetragonal phase grows with the increase of calcining temperature in BZT-0.5BCT, and the characteristic ferroelectric-ferroelectric phase transition in BZT-xBCT while going through the MPB process. The structural and constituent evolution for the conversion process from gel to ceramic, as well as the formation mechanism of the BZT-0.5BCT crystallite, were also elucidated.
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