1. Preparation of cerium titanate brannerite by solution combustion, and phase transformation during heat treatment.
- Author
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Kong, Linggen, Gregg, Daniel J., Vance, Eric R., Karatchevtseva, Inna, Lumpkin, Gregory R., Blackford, Mark G., Holmes, Rohan, Jovanovic, Miodrag, and Triani, Gerry
- Subjects
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OXIDE minerals , *TOXICOLOGY of combustion gases , *PHASE transitions , *HEAT treatment of metals , *RAMAN spectroscopy - Abstract
An aqueous solution route was employed to prepare cerium titanate oxide brannerite. Thermal analysis, X-ray diffraction, Raman spectroscopy, transmission and scanning electron spectroscopy, were used to investigate the brannerite structure formation and bulk properties. Mixed metal oxides (TiO 2 , CeO 2 and brannerite CeTi 2 O 6 ) were formed upon calcination at 800 °C for 12 h. The amount of brannerite phase decreased to form the constituent oxides with increasing calcination temperature and only pure TiO 2 and CeO 2 were present after 1200 °C calcination. The brannerite CeTi 2 O 6 phase reformed at 1300 °C, and its relative amount was increased with dwell time. After 48 h calcination at 1300 °C, brannerite with only minor metal oxide impurities (<1%) was observed. The sample melted at 1400 °C which led to the collapse of brannerite back to its constituent oxides. Further, the phase formation was influenced by pelletization of the powders, which may be explained by a molar volume increase during brannerite formation. Attempts to confirm this hypothesis using Pu brannerite were inconclusive. [ABSTRACT FROM AUTHOR]
- Published
- 2017
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