Transformation kinetics of Ba 2Ti 9O 20 with ZrO 2 additive
Journal
Journal of the American Ceramic Society
Journal Volume
89
Journal Issue
12
Pages
3846-3849
Date Issued
2006
Author(s)
Abstract
Pure Ba 2 Ti 9 O 20 (BT29) was synthesized by a solid‐state reaction in one step with various amounts of ZrO 2 powder additive. The transformation kinetics of BT29 were investigated by quantitative X‐ray diffractometry (XRD). The results show that stoichiometric powder mixtures transform to the BT29 phase by nucleation and growth mechanism between 1200° and 1300°C with 1.0 mol% ZrO 2. The activation energy of the transformation was found to be 620±60 kJ/mol, but decreases to 515±30 kJ/mol when doped with 1.0 mol% ZrO 2 . The addition of ZrO 2 possibly changes the phase transformation mechanism of BT29 from diffusion controlled to interface controlled.
SDGs
Type
journal article