High pressure phase equilibria in the Li3N-BN system: in situ studies

Powder diffraction of synchrotron radiation at pressures up to 6.3 GPa and DTA at ambient pressure were used to study phase equilibria in the Li3N-BN system at temperatures up to 1820 K. The construction of the Li3N-BN quasibinary section of the Li-B-N ternary system has been refined. The melting of...

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Bibliographic Details
Published in:Materials letters 1997-08, Vol.32 (2-3), p.179-184
Main Authors: Solozhenko, Vladimir L., Turkevich, Vladimir Z.
Format: Article
Language:English
Subjects:
Condensed matter: structure, mechanical and thermal properties
Cubic boron nitride
Equations of state, phase equilibria, and phase transitions
Exact sciences and technology
Heat capacities of solids
High pressure
In situ studies
Li-B-N system
Phase equilibria
Physics
Specific phase transitions
Thermal properties of condensed matter
Thermal properties of crystalline solids
Thermodynamic properties
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Summary:Powder diffraction of synchrotron radiation at pressures up to 6.3 GPa and DTA at ambient pressure were used to study phase equilibria in the Li3N-BN system at temperatures up to 1820 K. The construction of the Li3N-BN quasibinary section of the Li-B-N ternary system has been refined. The melting of the high-pressure phase of Li3BN2has been shown to be of an incongruent nature. The existence of the Li3BN2(O) ⇄ L + BN peritectic equilibrium at 1620 K and 5.3 GPa has been established. It was shown that this peritectic reaction defines the lowest possible temperature of formation of cubic boron nitride in the Li3N-BN system (1670 ± 50 K in the 5.3–6.3 GPa range).
ISSN:0167-577X
1873-4979
DOI:10.1016/S0167-577X(97)00025-6