Speaker
Description
BaTiO3 is a lead-free piezoceramic of growing interest because of the new RoHS regulations on hazardous materials.Hence,there is a growing interest in the sustainable fabrication of BaTiO3 to be employed in piezoelectric devices e.g.,tunable devices for electronic and biomedical applications.Among various sustainable processing routes,Reactive Hydrothermal Phase Densification(rHLPD) is of particular interest.It consists of infiltration,hydrothermal reaction,and reactive crystallization of the titanate from the TiO2 precursor.The infiltration of Ba(OH)2 aqueous solution occurs via interconnected pores of an anatase preform,which is converted into BaTiO3 in hydrothermal conditions.The porosity is filled by reaction products having a higher molar volume than that of the reactants, giving a highly dense BaTiO3 ceramic.In this work, we investigate the kinetics of the phase transformation and correlate it with the microstructural evolution of the reactively sintered bodies.The effect of the different processing parameters governing the transformation is deeply studied, including temperature,time,composition of the solution, and particle size.The addition of mineralizer (NaOH/ KOH) can significantly change the reaction rate as well as the use of different particle sizes,nanopowder green bodies fully converting into the titanate in 48hr.Structural/electrical characterization studies are underway to confirm the promising potential of this environmentally friendly manufacturing process
| Professional Status of the Speaker | Doctoral or Master Student |
|---|---|
| Invitation letter for visa | No |
| Interest in submitting a paper in a special issue of | No interest |
