Molecular Dynamics Simulation of the Strain-polarization Coupling in BaTiO3 Ferroelectrics

作者：Liu Bai Nian^*; Ma Ying; Zhou Yi Chun

来源：Journal of Inorganic Materials, 2010, 25(12): 1247-1251.

DOI：10.3724/SP.J.1077.2010.01247

• molecular dynamics
• BaTiO3 ferroelectrics
• strain-polarization coupling

Based on a modified shell model, the strain-polarization coupling was studied by molecular dynamics simulations. Using DL_POLY software packages, the lattice constant and spontaneous polarization were calculated and the results were in good agreement with experiments. The polarization switching process and the filed induced strain effects were further simulated. The results clearly suggested the existence of strong strain-polarization coupling effects in BaTiO3. Finally, the dependence of polarization on the strain was studied. Under compressive strain, the spontaneous polarization increases almost linearly with increasing strain. However, under tensile strain, the polarization decreases rapidly. When the biaxial tensile strain epsilon(s) reaches 0.8%, the polarization along the c axis disappears and a non-zero polarization value exists along the a axis, indicating a 90 degrees rotation of the polarization.

• 出版日期2010-12
• 单位湘潭大学