Journal
JOURNAL OF APPLIED PHYSICS
Volume 110, Issue 10, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3662196
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Funding
- National Basic Research Program of China [2009CB623306]
- International Science & Technology Cooperation Program of China [2010DFR50480]
- National Nature Science Foundation of China [50872107, 10875095]
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Flexoelectric effect, which is defined as strain gradient-induced polarization or electric gradient-induced strain in crystalline solids, can be presented as a fourth-rank tensor. The symmetry of the flexoelectric coefficients in matrix form is studied. The results indicate that the direct flexoelectric coefficients should be presented in 3 x 18 form and the converse flexoelectric coefficients in 6 x 9 form, rather than 6 x 6 form, like elastic constants. In addition, non-zero and independent elements in the matrices have been calculated for 32 point groups and 7 Ci groups. These results will provide valuable reference to the theoretical and application studies of flexoelectric effect. (C) 2011 American Institute of Physics. [doi:10.1063/1.3662196]
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