Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1522148 | Materials Chemistry and Physics | 2014 | 6 Pages |
Abstract
Monoclinic RbD2PO4 polycrystals (DRDP) were synthesized via the room temperature crystallization of RbH2PO4 (RDP) dissolved in D2O. Powder X-ray diffraction (XRD) data collected at T = 25 °C indicate that this deuterated compound crystallizes in spacegroup P21/m with unit cell parameters a = 7.688 Ã
, b = 6.192 Ã
, c = 4.781 Ã
and β = 109.02°, and is isomorphic with the intermediate-temperature phase of its hydrogenated counterpart RDP. We found no evidence of a previously reported [Phase Transitions 80, 17 (2007)] polymorphic phase transition in DRDP upon heating from room temperature to 210 °C. All lattice parameters vary smoothly within this temperature range, demonstrating that the P21/m phase persists upon heating. In addition, the unit cell volume of monoclinic DRDP is â¼1% greater than that of its RDP polymorph at all temperatures between 150 °C and 210 °C, which indicates the absence of significant deuterium-hydrogen isotope exchange. Further heating to 240 °C leads to the thermal decomposition of the title compound via dehydration.
Related Topics
Physical Sciences and Engineering
Materials Science
Electronic, Optical and Magnetic Materials
Authors
Cristian E. Botez, Masoud Mollaee, Andres J. Encerrado Manriquez, Michael P. Eastman,