Neutron Diffraction Study of a Rb_<0.5>Tl_<0.5>H_2PO_4 Single Crystal(Condensed matter: structure and mechanical and thermal properties)

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概要

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• Crystal structure analysis of a mixed crystal Rb_<1-x>Tl_xH_2PO_4(x=0.5) was performed at room temperature by neutron diffraction on a high-quality single crystal grown from aqueous solution. RbH_2PO_4 (RDP) and TlH_2PO_4 (TDP) show distinct crystal structures despite the same ionic radii of Rb and Tl. The crystal structure of Rb_<0.5>Tl_<0.5>H_2PO_4 is isotypic to TDP showing disordered H atoms in the O…__-H…__-O hydrogen bonds. The lone-pair electrons of Tl^+ ions are believed to stabilize the two-dimensional network of hydrogen bonded PO_4-groups. In contrast to the case of TDP, Rb_<0.5>Tl_<0.5>H_2PO_4 shows no phase transition at low temperatures despite the disordered character, with a strengthening of two hydrogen bonds as indicated by shorter O…O distances and greater O…__-H…__-O bond angles.

• 社団法人日本物理学会の論文
• 2008-09-15

著者

• LEE Cheol

  Department of Medicine, University of Ulsan College of Medicine, Asan Medical Center

• Lee Cheol

  Department Of Physics And Institute For Nano Science Korea University

• OH In-Hwan

  Department of Physics and Institute for Nano Science, Korea University

• MATTAUCH Stefan

  Institut fur Festkorperforschung, Julich Centre for Neutron Science

• HEGER Gernot

  Institut fur Kristallographie, RWTH Aachen

• Oh In-hwan

  Department Of Physics And Institute For Nano Science Korea University:institut Fur Kristallographie

• Oh In-hwan

  Department Of Image Eng. Graduate School Of Aim Chung-ang Univ.

• Heger Gernot

  Institut Fur Kristallographie Rwth Aachen

• Lee Cheol

  Department Of Chemical Engineering Hanyang University

• Mattauch Stefan

  Institut Fur Festkorperforschung Julich Centre For Neutron Science

• Heger Gernot

  Institut für Kristallographie, RWTH Aachen, Jägerstr. 17-19, D-52056, Aachen, Germany

• OH IN-HWAN

  Department of Chemical Engineering, Korea Advanced Institute of Science and Technology

• Lee Cheol

  Department of Anesthesiology and Pain Medicine, Wonkwang University School of Medicine

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