Abstract
We have used synchrotron X-ray diffraction to investigate the structural and chemical changes undergone by polycrystalline KH 2PO 4 (KDP) upon heating within the 30–250 °C temperature interval. Our data show evidence of a polymorphic transition at T∼190 °C from the room-temperature tetragonal KDP phase to a new intermediate-temperature monoclinic KDP modification (spacegroup P2 1/ m and lattice parameters a=7.590, b=6.209, c=4.530 Å, and β=107.36°). The monoclinic RDP polymorph remains stable upon further heating to 235 °C, and is isomorphic to its RbH 2PO 4 and CsH 2PO 4 counterparts.
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