Related Experiment Video
Updated: Oct 4, 2025

Laser-heating and Radiance Spectrometry for the Study of Nuclear Materials in Conditions Simulating a Nuclear Power Plant Accident
Published on: December 14, 2017
FOX-7 high-energy-density material: thermal expansion and phase transitions revisited
Charles J McMonagle1, Adam A L Michalchuk2, Dmitry Chernyshov1
1SNBL at ESRF, Grenoble, France.
Abstract:
Variable-temperature single-crystal diffraction experiments treated with the Gandolfi method reveal the detailed temperature evolution of the unit-cell dimensions, structural transformations and the phase co-existence of the energetic material FOX-7. Two first-order phase transitions are observed accompanied by abrupt changes in volume and unit-cell dimensions. The thermal expansion is found to be linear for all three phases, albeit highly anisotropic. Moreover, the experimental thermal expansion coefficients differ from those predicted from literature atomistic simulations.
Related Concept Videos
Phase Transitions: Melting and Freezing
Phase Transitions
Phase Transitions: Vaporization and Condensation
Phase Transitions: Sublimation and Deposition
States of Matter and Phase Changes
Phase Changes
A substance melts or freezes at a temperature called its melting point and boils or condenses at its boiling point. These temperatures depend on pressure. High pressure favors the denser form of the substance, so typically, high pressure...

