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. Author manuscript; available in PMC: 2016 Mar 1.

Published in final edited form as: Mater Sci Eng R Rep. 2015 Mar 1;89:1–48. doi: 10.1016/j.mser.2015.01.002

Comparison of the Q_33−r /Q_33−a value in the Q_m - tanμ region for various k₃₃ values: (a) k₃₃ = 0.4; (b) k₃₃ = 0.7; (c) k₃₃ = 0.9. The strong electromechanical coupling effect introduces an obvious difference between the values of Q_33−r and Q_33−a, as confirmed by the dark blue (Q_33−r << Q_33−a) and red areas (Q_33−r >> Q_33−a) shown in (c).