Piezoelectric properties of polymer/lead-free ceramic composites

Mike Alexandre (1) , Camille Bessaguet (1) , Charlotte David (1) , Eric Dantras (1) , Colette Lacabanne (1)

1 CIRIMAT - Centre interuniversitaire de recherche et d'ingenierie des matériaux

Thermoplastic/lead-free piezoelectric ceramic composite have been prepared. Sodium niobate (NaNbO3) has been chosen for its high Curie temperature. Moreover, it could be synthesized with two different morphologies: NaNbO3 nanowires (NN NW’s) and NaNbO3 particles (NNP’s). The filler has been dispersed in thermoplastic matrices with different dielectric permittivities eM: PA11 (εM = 2) and polyvinylidene fluoride (PVDF) ( εM = 10). Due to polarization conditions, only ceramic particles are poled. The piezoelectric coefficient (d33) has been measured in composites. The higher d33 is recorded in composites based on PA11 (d33 = 6.5 pC.N¡1 for 30 vol. % NN NW’s). The influence of the NN aspect ratio on PVDF/NN composites has been analysed: the higher d33 (d33 = 2.6 pC.N^-1 for 25 vol. %) is recorded in PVDF/NN P’s. The major interest of these hybrid lead-free piezoelectric composites is mild poling conditions, ductility and thermal stability of piezoelectric performances.

Mots clés: Lead-free ceramic; Sodium niobate; Polymer/piezoelectric ceramic composite; Thermoplastic polymer; Nanowire; Aspect ratio

Domaines: Matériaux

Mike Alexandre, Camille Bessaguet, Charlotte David, Eric Dantras, Colette Lacabanne. Piezoelectric properties of polymer/lead-free ceramic composites. Phase Transitions, 2016, 89 (7-8), pp.708-716. ⟨10.1080/01411594.2016.1206898⟩. ⟨hal-01469215⟩