research papers
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.
Keywords: Gandolfi method; energetic materials; thermal expansion; phase transition; variable temperature.
Supporting information
Portable Document Format (PDF) file https://doi.org/10.1107/S2052520621013299/ra5108sup1.pdf |