Low-Temperature Paraelectric-Ferroelectric Phase Transformation in Hydrothermal BaTiO₃ Particles

Journal Article · Thu Sep 01 04:00:00 EDT 2005 · Materials Letters

DOI:https://doi.org/10.1016/j.matlet.2005.03.068· OSTI ID:15020643

Qi, Lai; Lee, Burtrand I; Badheka, Prerak; Wang, Li Q; Gilmour, Philip; Samuels, William D; Exarhos, Gregory J

We report the synthesis of tetragonal submicron barium titanate particles through a low-temperature solvothermal treatment. Effort has been concentrated on the variation of particle characteristics including particle size and c/a ratio, as a function of treatment conditions. The tetragonality of the treated BaTiO particles increased from 30% to 80% confirmed by X-ray diffraction and differential scanning calorimetry. No appreciable change in particle morphology was observed after the treatments. Extraction of the lattice hydroxyls and consequential reduction of porosity were believed to be the cause of the tetragonality raise, as confirmed by the infrared spectroscopy, solid-state nuclear magnetic resonance and specific surface area investigation. This work presents a practical and simple route for preparing freestanding tetragonal BaTiO particles.

• Research Organization: Pacific Northwest National Laboratory (PNNL), Richland, WA (US)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 15020643
• Report Number(s): PNNL-SA-44637; KC0201050
• Journal Information: Materials Letters, Journal Name: Materials Letters Journal Issue: 22 Vol. 59
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BARIUM COMPOUNDS
CALORIMETRY
MORPHOLOGY
NUCLEAR MAGNETIC RESONANCE
PARTICLE SIZE
PHASE TRANSFORMATIONS
POROSITY
SPECIFIC SURFACE AREA
SYNTHESIS
TITANATES
X-RAY DIFFRACTION