Monoclinic RbD$_{2}$PO$_{4}$: room temperature synthesis, chemical and structural stability upon heating

POSTER

Abstract

Monoclinic RbD$_{2}$PO$_{4}$ polycrystals (DRDP) were synthesized via the room tempearture crystallization of RbH$_{2}$PO$_{4}$ (RDP) dissolved in D$_{2}$O. Powder x-ray diffraction (XRD) data collected at T$=$25$^{\circ}$C indicate that this deuterated compound crystallizes in spacegroup P2$_{1}$/m with unit cell parameters a$=$7.688{\AA}, b$=$6.192{\AA}, c$=$4.781{\AA} and $\beta =$109.02, and is \textit{isomorphic} with the intermediate-temperature phase of its hydrogenated counterpart RDP. We found no evidence of previously reported [\textit{Phase Transitions} \textbf{80}, 17 (2007)] polymorphic phase transition in DRDP upon heating from room temperature to 210$^{\circ}$C. All lattice parameters vary smoothly within this temperature range, demonstrating that the P2$_{1}$/m phase persists upon heating. In addition, the unit cell volume of monoclinic DRDP is $\sim$ 1{\%} greater than that of its RDP polymorph at all temperatures between 150$^{\circ}$C and 210$^{\circ}$C, which indicates the absence of significant deuterium-hydrogen isotope exchange. Further heating to 240$^{\circ}$C leads to the thermal decomposition of the title compound via dehydration.

Authors

  • Cristian Botez

    University of Texas at El Paso

  • Hanu Arava

    University of Houston, University of Texas at Brownsville, None, Univ of Texas, San Antonio, University of Texas at El Paso, Univ of Arizona, Department of Physics and Astronomy and Center for Gravitational Wave Astronomy, University of Texas at Brownsville, Laboratoire des Mat\'eriaux Avanc\'es, Universit\'e Claude Bernard Lyon 1, UTEP, University of Texas, Austin, University of Texas at Austin, Institute for Astronomy, Russian Academy of Sciences, University of Texas at Arlington, The University of Texas at Arlington, MIT, U. Mass. Dartmouth, Texas A{\&}M University, Texas Christian University, Laboratoire des Mat\'erieux Avanc\'es B\^atiment Virgo, Ion Beam Materials Laboratory, Los Alamos National Laboratory, Texas A\&M University, Accelerator Research Laboratory, University of Florida, The Ohio State University, Yale University, University of Guelph, Canada, Armagh Observatory, NASA-Ames, NASA-Goddard, Texas A\&M University-Commerce, Texas A\&M University, Hanyang University, Texas A\&M Univ, Department of Pharmacy, Mazandaran University of Medical Sciences, Sari, Iran, Physics Department, Texas State University at San Marcos

  • Hanu Arava

    University of Houston, University of Texas at Brownsville, None, Univ of Texas, San Antonio, University of Texas at El Paso, Univ of Arizona, Department of Physics and Astronomy and Center for Gravitational Wave Astronomy, University of Texas at Brownsville, Laboratoire des Mat\'eriaux Avanc\'es, Universit\'e Claude Bernard Lyon 1, UTEP, University of Texas, Austin, University of Texas at Austin, Institute for Astronomy, Russian Academy of Sciences, University of Texas at Arlington, The University of Texas at Arlington, MIT, U. Mass. Dartmouth, Texas A{\&}M University, Texas Christian University, Laboratoire des Mat\'erieux Avanc\'es B\^atiment Virgo, Ion Beam Materials Laboratory, Los Alamos National Laboratory, Texas A\&M University, Accelerator Research Laboratory, University of Florida, The Ohio State University, Yale University, University of Guelph, Canada, Armagh Observatory, NASA-Ames, NASA-Goddard, Texas A\&M University-Commerce, Texas A\&M University, Hanyang University, Texas A\&M Univ, Department of Pharmacy, Mazandaran University of Medical Sciences, Sari, Iran, Physics Department, Texas State University at San Marcos

  • Hanu Arava

    University of Houston, University of Texas at Brownsville, None, Univ of Texas, San Antonio, University of Texas at El Paso, Univ of Arizona, Department of Physics and Astronomy and Center for Gravitational Wave Astronomy, University of Texas at Brownsville, Laboratoire des Mat\'eriaux Avanc\'es, Universit\'e Claude Bernard Lyon 1, UTEP, University of Texas, Austin, University of Texas at Austin, Institute for Astronomy, Russian Academy of Sciences, University of Texas at Arlington, The University of Texas at Arlington, MIT, U. Mass. Dartmouth, Texas A{\&}M University, Texas Christian University, Laboratoire des Mat\'erieux Avanc\'es B\^atiment Virgo, Ion Beam Materials Laboratory, Los Alamos National Laboratory, Texas A\&M University, Accelerator Research Laboratory, University of Florida, The Ohio State University, Yale University, University of Guelph, Canada, Armagh Observatory, NASA-Ames, NASA-Goddard, Texas A\&M University-Commerce, Texas A\&M University, Hanyang University, Texas A\&M Univ, Department of Pharmacy, Mazandaran University of Medical Sciences, Sari, Iran, Physics Department, Texas State University at San Marcos