INTEMA 05428
INSTITUTO DE INVESTIGACIONES EN CIENCIA Y TECNOLOGIA DE MATERIALES
Unidad Ejecutora - UE
artículos
Título:
Phase structure and piezoelectric properties of Ca-and Ba-doped K1/2Na1/2NbO3 lead-free ceramics
Autor/es:
JONATHAN TAUB; LEANDRO ALDREDO RAMAJO; MIRIAM SUSANA CASTRO
Revista:
CERAMICS INTERNATIONAL
Editorial:
ELSEVIER SCI LTD
Referencias:
Año: 2012 vol. 39 p. 3555 - 3561
ISSN:
0272-8842
Resumen:
Piezoelectric lead-free ceramics, K1/2Na1/2NbO3 (KNN) modified with alkaline-earth (AE) Ca2+ and Ba2+, have been prepared by the conventional solid-state reaction method. The effect of doping level on sinterability and functional response of KNN was studied. In this way, discs doped with 0 to 2 mol% of Ba2+ and Ca2+ were sintered at 1125ºC for 2h. It was observed that AE changed drastically the microstructure and grain size of KNN when it was added in concentrations higher than 0.5 mol%. Addition of 0.5mol% of Ba2+ and Ca2+ produced a softening effect in the ferroelectric properties of the material, while samples prepared with higher contents than 0.5mol% showed poor properties.
