Phase equilibria in the system BaO–TiO 2
Year: 2024
Type: article
Abstract: The system BaO–TiO 2 is technically important because it contains multiple dielectric and ferroelectric phases, including the important BaTiO 3 , which is one of the most widely studied dielectric perovskites owing to its dual piezoelectric and ferroelectric properties. The present work revises the subsolidus phase equilibria data by synthesizing previous phase equilibria data and new experimental results using high‐temperature (600°–1300°C) and long‐term (≤336 h) equilibration, coupled with analytical work based principally on room‐temperature X‐ray diffraction. The resultant phase diagram is given in both mole and weight percents, extending from the liquidus surface (not investigated) to absolute zero temperature (for inclusion of the previously excluded crystallographic and ferroelectric phase transformations). The major features include (1) correction of four eutectoid and three peritectoid reactions and corresponding temperatures, (2) indication of inferred partial solid solubilities, (3) clarification of the BaTiO 3 solid solubility homogeneity regions, and (4) specification of some invariant point compositions on the liquidus surface.
DOI: 10.1111/jace.20143
Institutions: UNSW Sydney, Mark Wainwright Analytical Centre
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $4,070
OpenAlex ID: W4402556742