D. Klimm, LOCAL PHASE-TRANSITION IN GAP AND GAAS ANALYZED USING INTERNAL-FRICTION AND YOUNGS MODULUS DATA, Physica status solidi. a, Applied research, 143(2), 1994, pp. 305-317
Two maxima of internal friction can be found near 320 K (peak I) or ne
ar 380 K (peak II), respectively, in GaAs (only peak I) and GaP at ult
rasonic frequencies near 105 kHz. Peak II can be attributed to some po
int defect relaxation mechanism, whereas peak I can be explained by a
local phase transition that can occur in the stress field of dislocati
ons moved by ultrasonic deformation. Numerical analysis of the measure
d Young's modulus yields a reaction order for the transition of 0.69 a
nd an activation energy of 113 kJ/mol.