Scopul nostru este sprijinirea şi promovarea cercetării ştiinţifice şi facilitarea comunicării între cercetătorii români din întreaga lume.
Autori: J. Marat-Mendes, Irinela Chilibon, R. Igreja, M. do Carmo, C. Dias, P. Inácio
Editorial: Proc. of The European Micro and Nano Systems EMN04 Conference, Advances& Applications for Micro&Nano Systems, ESIEE, Noisy le Grand - Paris, France, ISBN 2-916187-02-2, 20-21 October 2004, p.149-153, 2004.
PbTiO3 (PT) ceramics were prepared by sol-gel method. The crystallisation and morphology properties were investigated by XRD, DSC and SEM microscopy. To study the influence of ultrasounds in the preparation process and properties of PbTiO3 ceramics, the gel phase was submitted on ultrasonic field of 35 kHz frequency and time about 40 minutes. Thermal hysteresis curves were determined by DSC 92 Differential Scanning Calorimeter, SETARAM, France in the temperature range 400 oC up to 500 oC, with a rate of 5 oC/min. All crystallised ceramics presented thermal hysteresis, but smaller than for the ultrasound samples. Also, Curie temperatures show higher values for the ultrasound samples, than those of the ceramic samples obtained in the classic process sol-gel.
Cuvinte cheie: ultrasound, PbTiO3 ceramics, sol-gel