Energetics of Ternary Nitride Formation in the (Li,Ca)−(B,Al)−N System

High-temperature oxide melt drop solution calorimetry was used to study the energetics of nitride formation. The standard enthalpies of formation of several binary and ternary nitrides were determined. These values (in kJ mol-1) are as follows:  ΔH f° (AlN) = −311.1 ± 4.3, ΔH f° (Li3BN2) = −534.5 ±...

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Bibliographic Details
Published in:Chemistry of materials 1999-04, Vol.11 (4), p.1148-1152
Main Authors: McHale, J. M, Navrotsky, A, DiSalvo, F. J
Format: Article
Language:English
Subjects:
Chemical thermodynamics
Chemistry
Elements, mineral and organic compounds
Exact sciences and technology
General and physical chemistry
Thermodynamic properties
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Summary:High-temperature oxide melt drop solution calorimetry was used to study the energetics of nitride formation. The standard enthalpies of formation of several binary and ternary nitrides were determined. These values (in kJ mol-1) are as follows:  ΔH f° (AlN) = −311.1 ± 4.3, ΔH f° (Li3BN2) = −534.5 ± 16.7, ΔH f° (Li3AlN2) = −567.8 ± 12.4, and ΔH f° (Ca3B2N4) = −1062.1 ± 15.4. From these values and others available in the literature, the enthalpies of formation of the ternary nitrides from the binary nitrides were calculated. The energetics of ternary nitride formation appear to be dominated by differences in the acid/base character of the cations.
ISSN:0897-4756
1520-5002
DOI:10.1021/cm981096n