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Understanding the peculiarities of the piezoelectric effect in macro-porous BaTiO3

机译:了解大孔BaTiO3中压电效应的特殊性

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摘要

This work demonstrates the potential of porous BaTiO3 for piezoelectric sensor and energy-harvesting applications by manufacture of materials, detailed characterisation and application of new models. Ferroelectric macro-porous BaTiO3 ceramics for piezoelectric applications are manufactured for a range of relative densities, α = 0.30–0.95, using the burned out polymer spheres method. The piezoelectric activity and relevant parameters for specific applications are interpreted by developing two models: a model of a 3–0 composite and a ‘composite in composite’ model. The appropriate ranges of relative density for the application of these models to accurately predict piezoelectric properties are examined. The two models are extended to take into account the effect of 90° domain-wall mobility within ceramic grains on the piezoelectric coefficients d3j*. It is shown that porous ferroelectrics provide a novel route to form materials with large piezoelectric anisotropy d33*d31*>>1 at 0.20 ≤ α ≤ 0.45 and achieve a high squared figure of merit d33* g33*. The modelling approach allows a detailed analysis of the relationships between the properties of the monolithic and porous materials for the design of porous structures with optimum properties.
机译:这项工作通过材料的制造,详细的特性描述和新模型的应用展示了多孔BaTiO3在压电传感器和能量收集应用中的潜力。使用燃尽的聚合物球体方法,可在一定范围的相对密度α= 0.30–0.95的条件下制造用于压电应用的铁电大孔BaTiO3陶瓷。通过开发两个模型来解释特定应用的压电活性和相关参数:3-0复合材料模型和“复合材料复合物”模型。为了应用这些模型来准确预测压电性能,研究了相对密度的适当范围。扩展了这两种模型,以考虑陶瓷晶粒内90°畴壁迁移率对压电系数的影响。 d 3 j * 。结果表明,多孔铁电体为形成具有大压电各向异性的材料提供了一条新颖的途径。 d 33 * <防御分隔符=“” open =“ |” close =“ |”> d 31 * 1 在0.20≤α≤0.45并获得高平方数优点<数学xmlns:mml =“ http://www.w3.org/1998/Math/MathML” id =“ M3” overflow =“ scroll”> d 33 * g 33 * 。建模方法允许对整体材料和多孔材料的性能之间的关系进行详细分析,以设计具有最佳性能的多孔结构。

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