Bessaguet, Camille and Dantras, Eric
and Lacabanne, Colette
and Chevalier, Mathieu
and Michon, Guilhem
Piezoelectric and mechanical behavior of NaNbO3/PEKK lead-free nanocomposites.
(2017)
Journal of Non-Crystalline Solids, 459. 83-87. ISSN 0022-3093
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(Document in English)
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Official URL: http://dx.doi.org/10.1016/j.jnoncrysol.2016.12.030
Abstract
Lead-free piezoelectric nanocomposites based on poly(ether ketone ketone) (PEKK) and sodium niobate (NaNbO3) particles were elaborated. The presence of submicronic particles does not influence the thermal stability of the matrix so that no degradation phenomenon is observed before 500 °C. The conservative mechanical modulus G′ increases linearly with the NaNbO3 fraction; this variation is well fitted by the Kerner model until 20 vol%. Such nanocomposites remain ductile. The polarizing field required for obtaining piezoelectric nanocomposites is 12 kV·mm−1 i.e. analogous with the one used for poling bulk ceramic. The value of the piezoelectric coefficient (d33 = 0.2 pC·N−-1 for 20 vol% NaNbO3) is consistent with the Furukawa's model. This value is explained by the low PEKK permittivity. This low d33 is counterbalanced by the piezoelectric voltage constant (g33 = 103·10−3 Vm·N−1) which is higher than the one of classical piezoelectric ceramic like PZT or BaTiO3.
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