Abstract
It follows from thermodynamic considerations that the observed influence of the electric field on the elastic coefficients is connected with certain — from the viewpoint of the piezoelectric equations of state — non-linear electromechanical effects observed before. Effects which are in a similar relation as the direct and the reversed piezo-electric effect can also be found among them. The relations between constants describing the individual effects enable us to compare the experimental results obtained by different methods. Thus they verify our own measurements.
In the first approximation all the non-linear electromechanical effects were included in the piezo-electric equations of state which were thus written in a non-linear form.
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I am greatly indebted to Dr. J. Tichý and V. Janovec, CSc, for a number of valuable comments which helped to improve my paper.
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Hruška, K. Non-linear equations of state of second-order electromechanical effects. Czech J Phys 14, 309–321 (1964). https://doi.org/10.1007/BF01689139
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DOI: https://doi.org/10.1007/BF01689139