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Influence of Uniaxial Tensile Stress on the Mechanical and Piezoelectric Properties of Short-period Ferroelectric Superlattice

机译:单轴拉伸应力对短周期铁电超晶格力学和压电性能的影响

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摘要

Tetragonal ferroelectric/ferroelectricsuperlattice under uniaxial tensile stress along the c axis is investigated from first principles. We show that the calculated ideal tensile strength is 6.85 GPa and that the superlattice under the loading of uniaxial tensile stress becomes soft along the nonpolar axes. We also find that the appropriately applied uniaxial tensile stress can significantly enhance the piezoelectricity for the superlattice, with piezoelectric coefficient d33 increasing from the ground state value by a factor of about 8, reaching 678.42 pC/N. The underlying mechanism for the enhancement of piezoelectricity is discussed.
机译:从第一性原理出发,研究了沿c轴单轴拉伸应力作用下的四方铁电/铁电超晶格。我们表明,计算得出的理想抗拉强度为6.85 GPa,并且在单轴拉伸应力的作用下,超晶格沿非极性轴变软。我们还发现,适当施加的单轴拉伸应力可以显着提高超晶格的压电性,压电系数d33从基态值增加大约8倍,达到678.42 pC / N。讨论了增强压电性的基本机理。

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