Journal
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
Volume 159, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jpcs.2021.110253
Keywords
HPHT synthesis; boron carbide; pressure effects; Paris-Edinburgh press; multi-anvil cell
Funding
- DGA (France)
- program NEEDS-Materiaux (France)
- Ecole Doctorale of Institut Polytechnique de Paris
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The formation temperature of boron carbide is affected by pressure and choice of reactants, with carbon content also varying with synthesis pressure. Additionally, temperature cycling can reduce the formation temperature of boron carbide.
The synthesis of boron carbide from its elements (boron and carbon) has been studied under pressures up to 13 GPa and optimum parameters have been determined by varying the (P, T, reactants) conditions. Stoichiometric mixtures of amorphous boron and amorphous carbon have been subjected to a range of temperatures from 1673 K to 2273 K at the pressure values of 2 GPa and 5 GPa. The formation temperatures have been compared to those obtained from mixtures of beta rhombohedral boron and graphite, and beta rhombohedral boron and amorphous carbon at 2 GPa and 5 GPa. The formation temperature is thus shown to be affected by the pressure and the choice of the reactants. The carbon concentration of boron carbide is also shown to be affected by the pressure at which it is synthesised from elements, and we propose pressure as a means to control the carbon content. Temperature cycling has also been shown to reduce the formation temperature of boron carbide at 13 GPa. The formation of alpha rhombohedral boron as an intermediate phase is seen at 5 GPa before the formation of boron carbide.
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