All 8 electrostrictive and all 3 third-order dielectric constants of lithium niobate have been determined. Measurements for the electrostrictive constants have been made by measuring electric capacity in selected direction when the directed static stresses were applied to the crystal. And the third-order dielectric constants have been calculated from these measured electrostrictive constants and the measured capacitance as a function of the applied static electric field. All of these measurements have been done at 15°C.
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