To date, even though a large number of shock wave induced irreversible crystal-crystal phase transitions have been reported for the past few decays, switchable phase transitions of solid state materials by dynamic shock waves remain to be quite un-known and also attainment of switchable phase transitions is somewhat a difficult task as compared to the irreversible phase transitions. Hence, experiments on switchable phase transition arising out of materials and the related publications are always considered to be valuable asserts for the materials researchers so as to master over the enhanced understanding of the behavior of materials and their probable applications. Moreover, materials of switchable phase have enormous number of spectacular industrial applications. In the present framework, we have presented and demonstrated the switchable phase transition of magnesium sulfate heptahydrate (MgSO4.7H2O) at shocked conditions and the switching behavior has been screened by diffraction, vibrational spectroscopic ACCEPTED MANUSCRIPT -CLEAN COPY 2 and optical spectroscopic techniques so as arrive at X-ray diffraction (XRD), Raman scattering and UV-Visible spectral analyses, respectively. All the observed results clearly reveal that the switchable phase transition is achieved at dynamic shock wave loaded conditions. The interesting aspects of the present experimental results with respect to the number of shock pulses are discussed in the upcoming sections.

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