Answers are grounded in this paper and cite their sources.
The temperature and pressure dependencies of the elasticity of amorphous carbon (a-C) have been measured using an ultrasonic technique. The microstructure and properties of a-C are found to be very sensitive to pressure and temperature. A striking softening of the long-wavelength acoustic phonons relative to the carbon crystals is observed in a-C. The pressure-volume hysteresis loop indicates that a first-order amorphous-to-amorphous phase transition occurs in a-C under high pressure.
No takes yet. Share an insight, caveat, or question.
Wei et al. (2005) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: