resumo
Lead-free piezoelectric ceramics gained an increased attention due to their high piezoelectric properties combined with the absence of lead and other potentially hazardous elements. In this work, we used a unimorph cantilever beam arrangement to study piezoelectric energy harvesting in pristine K0.5Na0.5NbO3 (KNN) and Fe2O3 modified KNN (KNFN) ceramics that are potential candidates for PZT replacement. The piezoelectric ceramics were synthesized using conventional solid state reaction method. The KNFN ceramics exhibited a superior piezoelectric performance: d (33) = 100 pC/N and mechanical quality factor (Q (m) = 135) as compared to KNN (d (33) = 83 pC/N; Q (m) = 76). In addition, the planar electromechanical coupling factor k (p) was higher in case of KNFN having a value of 0.39 as compared to 0.34 for KNN. The KNFN harvester generated an output power of 0.38 mW/cm(3) at a load resistance of 470 k Omega for a transverse displacement amplitude of 1.2 mm. The prospects of using lead-free ceramics for piezoelectric energy harvesting are discussed.
palavras-chave
PZT; NANOGENERATOR; DENSITY
categoria
Materials Science
autores
Coondoo, I; Panwar, N; Maiwa, H; Kholkin, AL
nossos autores
Andrei Kholkin
Investigador Principal
Indrani Coondoo
Investigador JúniorGrupos
G2 - Materiais Fotónicos, Eletrónicos e Magnéticos
G4 - Materiais Renováveis e Economia Circular
Projectos
NOLEAD: Novel lead-free ferroelectric films by PLD for optoelectronics (PTDC/FIS/108025/2008)
agradecimentos
One of the authors (I.C.) would like to thank the Portuguese Foundation for Science and Technology (FCT) for the Postdoctoral Grant [No. SFRH/BPD/81032/2011]. Funding from FCT project PTDC/FIS/108025/2008 is highly appreciated.