Intermediate-temperature polymorphic phase transition in KH2PO4: A synchrotron X-ray diffraction study |
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| Authors: | Cristian E. Botez David Carbajal Ronald J. Tackett |
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| Affiliation: | a Department of Physics, University of Texas at El Paso, 500W University Avenue, El Paso, TX 79968, USA
b Department of Chemistry, University of Texas at El Paso, 500W University Avenue, El Paso, TX 79968, USA |
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| Abstract: | We have used synchrotron X-ray diffraction to investigate the structural and chemical changes undergone by polycrystalline KH2PO4 (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 P21/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 RbH2PO4 and CsH2PO4 counterparts. |
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| Keywords: | A. Inorganic compounds B. Chemical synthesis C. X-ray diffraction D. Phase transitions |
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