Reversible disorder-order type structural phase transition of potassium dihydrogen phosphate bulk single crystals induced by dynamic shock waves

Abstract

In this article, we report the reversible disorder-order type structural phase transition of potassium dihydrogen phosphate (KDP) bulk single crystal at dynamic shock pulses loaded conditions and the core results of the disorder-order type structural phase transitions have been authenticated by X-ray diffraction (XRD) and Raman spectroscopic results. In order to have further substantiation, we have also performed optical spectroscopic and microscopic analyses. As per the obtained data from the XRD, Raman and microscopic results, the control KDP crystal has the disordered type tetragonal structure whereas, at the 1st shocked condition, we observe a completely ordered tetragonal structure. Surprisingly, at the 2nd shocked condition, the disordered tetragonal structure has been retrieved. To the best of our knowledge, to date, this kind of reversible disorder-order type phase transition may be the first report on the research findings of KDP crystal.