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Thermodynamic Assessment of the GalliumNitrogen System

Summary: Thermodynamic Assessment
of the Gallium­Nitrogen System
A. V. Davydov1
) (a), W. J. Boettinger (a), U. R. Kattner (a),
and T. J. Anderson (b)
(a) Metallurgy Division, NIST, Gaithersburg, MD 20899, USA
(b) Chemical Engineering Department, University of Florida, Gainesville, FL 32611, USA
(Received July 16, 2001; accepted July 16, 2001)
Subject classification: 64.30.+t; 64.70.Dv; 64.70.Hz; S7.14
Thermochemical and phase diagram data for the Ga­N system were assessed by employing the
CALPHAD method. A consistent model representation of available thermodynamic properties agrees
well with the critically evaluated experimental data. Thermodynamic extrapolation/interpolation of
these data was applied to estimate the sublimation and melting characteristics of the GaN compound: at
atmospheric pressure of nitrogen, gallium nitride sublimates incongruently by decomposing into nitro-
gen-rich gas and gallium-rich liquid, but can melt congruently at high nitrogen pressure (%4.9 GPa).
Introduction Development of group-III nitride electronic and optoelectronic devices is
hindered by several materials issues: challenges in synthesizing quality bulk single crys-
tal substrates; degradation of device structures during processing and/or operation
caused in part by thermal decomposition of group-III nitrides. Knowledge of the pres-
sure­temperature­composition (P­T­x) phase diagrams and thermochemical proper-


Source: Anderson, Timothy J. - Chemical Engineering Department, University of Florida


Collections: Materials Science