In this framework, the authors have intended to examine the phase-transitionprobability of ammonium sulfate (NH 4 )2 SO 4 under dynamic shock loadedconditions, whereby it is authenticated from the observations that the title crystalundergoes the process of reversible phase transition of crystallographic nature.The observed phase-transition sequence isPnam (crystalline) !Pnam (crys-talline) ! distortedPnam (semicrystalline) !Pnam (crystalline) !Pnam (crys-talline) under the exposure of 0, 1, 2, 3, and 4 shocks, respectively, such that theorder of the transition is evaluated by diffraction and spectroscopic techniques.The obtained differential scanning calorimetry and thermogravimetric analysisresults provide the crystalline-state ammonium sulfate which has higher thermalstability than that of the disordered-state ammonium sulfate. Analyzing theacquired results of the analytical experiments, the authentication can be arrivedat such that the phase transition of reversible nature is enforced by the moleculardistortions followed by the occurrence of rotational disorder involving ammo-nium and sulfate groups of ions influenced by the impulsion of shock wavesthereby the title crystal can be a potential material for molecular switchingapplications.RESEARCH ARTICLEwww.pss-b.comPhys. Status Solidi B 2024, 261, 2300549 2300549 (1 of 10) © 2024 Wiley-VCH GmbH