Crystal Research and Technology
Cryst. Res. Technol. 35 (2000) 501 - Abstract -

S. Mattauch, W. Paulus*, J. Glinnemann, G. Roth, G. Heger

Institut für Kristallographie, RWTH Aachen
*LCSIM, Université Rennes I.

Crystal Structure of RbD2PO4*D2O: A new Hydrate Phase of KDP-type Compounds

The mono-hydrate phase as well as the water-free RbD2PO4 (DRDP) is obtained by crystal growth from fully deuterated aqueous solution. Its crystal structure was determined by combined neutron and X-ray single crystal diffraction. It consists of double layers of PO4 tetrahedra with D2O planes in between. The PO4 groups are linked by fully ordered deuterium bonds O-D-O. RbD2PO4*D2O dehydrates below 329(5)K and undergoes a phase transition to RbD2PO4 (DRDP).

Keywords: DRDP; mono-hydrate; neutron diffraction; X-ray diffraction


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