Nano Ideas

Nanoscale Research Letters

, Volume 5, Issue 2, pp 448-452

Open Access This content is freely available online to anyone, anywhere at any time.

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

  • Yifeng DuanAffiliated withDepartment of Physics, China University of Mining and Technology Email author 
  • , Chunmei WangAffiliated withSchool of Aerospace, Xi’an Jiaotong University
  • , Gang TangAffiliated withDepartment of Physics, China University of Mining and Technology
  • , Changqing ChenAffiliated withDepartment of Engineering Mechanics, AML, Tsinghua University

Abstract

Tetragonal ferroelectric/ferroelectric \(\hbox{BaTiO}_3/\hbox{PbTiO}_3\) superlattice 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 d 33 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.

Keywords

Mechanical property Piezoelectricity Ferroelectric superlattice