First Observation of the Increase in Atomic Mean Square Displacements upon Glass Formation : Inelastic Neutron Scattering Study of K_<1-x>(NH_4)_xH_2PO_4 Mixed Crystals

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概要

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• The low-temperature lattice dynamics of K_<1-x>(NH_4)_xH_2PO_4 mixed crystals have been studied using high-resolution inelastic-neutron-scattering on powders for x=0.0; 0.06; 0.1; 0.18; 0.3; 0.6 and 0.9. The influence of ammonium ion concentration on the hydrogen dynamics has been analysed. The mean square displacements of hydrogen bonded acid protons are found to be larger in the glass phase than in the ordered ferroelectric or antiferroelectric phases. It was found that a vibrational mode at 16.8 meV is strongly coupled with the ferroelectric modes.

• 社団法人日本物理学会の論文
• 1993-02-15

著者

• Tomkinson J

  Rutherford Appleton Laboratory

• Belushkin V.

  Rutherford Appleton Laboratory

• Tomkinson J.

  Rutherford Appleton Laboratory

• Shuvalov A.

  Institute of Crystallography

• Fedosyuk M.

  Institute of Crystallography

• Belushkin A.V.

  Rutherford Appleton Laboratory

関連論文

• First Observation of the Increase in Atomic Mean Square Displacements upon Glass Formation : Inelastic Neutron Scattering Study of K_(NH_4)_xH_2PO_4 Mixed Crystals

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