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Converse electrostriction in polymers and compositesby: S. Eury
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AbstractThe evaluation of electrostrictive properties of low permittivity dielectrics requires extremely sensitive instrumentation. In the present work, a modified compressometer capable of resolving fractional changes in capacitance of the order of 10-6 is used. In the compressometric method, a high sensitivity capacitance bridge, GenRad 1615, is coupled with two lock-in amplifiers to detect attofarad (10-18F) level capacitance changes caused by in-phase cyclic uniaxial stresses on the samples. In studying low-permittivity polymers, we have obtained extensive electrostriction data, which along with widely accepted data on ferroelectric materials and soft polymers, verify the linear relationship between electrostriction coefficient (Q) and the ratio of elastic compliance and dielectric permittivity (s/0r). This leads to an effective way to predict the electrostriction coefficient in dielectric materials.
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