A Thermodynamic Analysis of Lanthanum Hexaboride Crystal Preparation from Aluminum Flux with the Use of Compound Precursors
✍ Scribed by P. Peshev
- Publisher
- Elsevier Science
- Year
- 1997
- Tongue
- English
- Weight
- 245 KB
- Volume
- 133
- Category
- Article
- ISSN
- 0022-4596
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✦ Synopsis
The temperature dependencies of the change in Gibbs energy for a series of probable reactions in the aluminothermic reduction of La 2 O 3 , LaCl 3 , and B 2 O 3 , borothermic reduction of La 2 O 3 , and synthesis of LaB 6 in an aluminum flux using compound precursors of the boride components have been plotted on the basis of thermodynamic data from the literature. It has been shown that under the experimental conditions of the growth of rare earth boride single crystals by crystallization from hightemperature solutions in molten aluminum, a rare earth oxide and B 2 O 3 should be used as precursors instead of the corresponding elements.