Dielectric and ferroelectric properties of A-site non-stoichiometric Na0.5Bi0.5TiO3-based thin films
Dielectric and ferroelectric properties of A-site non-stoichiometric Na0.5Bi0.5TiO3-based thin films
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A位非化学计量Na0.5Bi0.5TiO3基薄膜的介电和铁电性能
DOI:
10.1016/j.matlet.2011.08.067
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发表时间:
2012
影响因子:
3
通讯作者:
X. Y. Zhang
中科院分区:
文献类型:
--
作者:
C. H. Yang;W. B. Wu;F. Yang;H. T. Wu;X. Y. Zhang
The A-site non-stoichiometry of [(Na0.7K0.2Li0.1)0.45Bi0.55]TiO3+x(NKLBT) films were epitaxially deposited on LaNiO3(100)/Si substrates using metal organic decomposition. The structural evolution of NKLBT films annealed at different temperatures is studied and a single perovskite phase can be found at the low temperature of 600°C. Ferroelectric hysteresis measurement shows a higher remanent polarization value of 15.6μC/cm2with a lower coercive field of 89kV/cm at 450kV/cm due to the lower concentration of oxygen vacancies by the donor doping effect. The frequency dependence of the capacitance–voltage behavior and the correlation between the capacitance–voltage and polarization–electric field are analyzed. The dielectric constant and dissipation factor are measured to be 690 and 0.04, respectively, at a frequency of 1MHz.
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