100nm是介于微米晶和纳米晶之间的重要临界尺寸,研究了平均晶粒尺寸为100nm的钛酸钡（BTO）陶瓷的微结构和铁电性能,分析了测试温度和外加电场对纳米晶钛酸钡陶瓷铁电性的影响。与超细纳米晶BTO陶瓷不同的是,100nm BTO陶瓷主要以四方相形式存在的;介电温谱显示,正交到四方相的相变具有典型的弥散特征,低温时介电损耗〈0.02。此外,铁电性能测试表明,100nm BTO陶瓷具有良好的铁电滞后特征,随着电场的增加,能量损耗密度、剩余极化强度和矫顽场均增加;随着温度的升高,陶瓷的铁电性在逐渐减弱,高于居里温度时由铁电相转为顺电相,铁电性消失。实验结果表明,100nm BTO陶瓷的铁电性与测试温度和外加电场有着密切的关系。
100nm is the crucial size between the micron-crystalline and the ultrafine nanocrystalline in BaTiO3 ceramics.Microstructure and ferroelectric properties were analyzed for 100nm BTO ceramics.Extrinsic temperature and applied field effects on ferroelectricity of BTO ceramics were studied in this paper.Different from ultrafine nano-crystalline BTO ceramics,tetragonal is the main phase;from the curves of ε-T,there is typical dispersion characteristics in orthorhombic to tetragonal phase transition,and the loss tangent(tanδ) is lower than 0.02.Moreover,the results indicated that,there is well ferroelectric hysteresis quality in BTO ceramics,with the increase of field,the energy loss density,Pr and Ec are increasing;however,ferroelectricity is reducing with the growth of temperature,when the temperature higher than Curie temperature,the ferroelectric phase shift to paraelectric phase,and there is disappearing of ferroelectric phase.Therefore,ferroelectricity is closely associated with the temperature and field.
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