The combustion synthesis of the ferroelectric material, BaTiO{sub 3}, studied by time-resolved X-ray diffraction
- College of Science and Allied Health, Grand Canyon University, Phoenix, Arizona 85017 (United States)
- Lawrence Livermore National Laboratory, University of California, PO Box 808, Livermore, California 94551 (United States)
The combustion synthesis of the common ferroelectric material, BaTiO{sub 3}, was developed using the stoichiometry: BaO{sub 2}+0.2thinspTi+0.8thinspTiO{sub 2}{r_arrow}BaTiO{sub 3}+0.3thinspO{sub 2}. An adiabatic temperature, T{sub ad}, of the reaction was calculated from known thermodynamic data to be 1917thinsp{degree}C. Real time chemical changes in the formation of BaTiO{sub 3} during the reaction have been monitored using time-resolved X-ray diffraction with synchrotron radiation as the X-ray source. A time resolution of 250 ms was achieved. The combustion synthesis of BaTiO{sub 3} was followed by observing the intensities of reactant and product Bragg diffraction peaks in order to qualitatively identify the phases present. Because BaTiO{sub 3} forms initially as a cubic phase, X-ray diffraction of the product was monitored for a period of 20 min after the reaction to observe the phase transformation to the tetragonal form. This transformation is evident in these post-reaction scans as the cubic 110 and 220 peaks are split to the tetragonal 101/110 and 202/220 ones, respectively. {copyright} {ital 1999 International Centre for Diffraction Data.}
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 348263
- Journal Information:
- Powder Diffraction, Vol. 14, Issue 2; Other Information: PBD: Jun 1999
- Country of Publication:
- United States
- Language:
- English
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