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. Fig, Influence of the poling electric field amplitude on the piezoelectric strain coefficient d 33 measured at room temperature for a PZT/PEEK composite (filled squares) and PZT/PA 11 composite (empty squares) both elaborated by extrusion and loaded at 30% in volume

. Fig, Evolution of the real part of the complex dielectric permittivity (taken at 1 kHz) as a function of temperature for neat PEEK polymer matrix (filled squares) and PA 11 polymer matrix (empty squares)