Crystal Structure and Phase Transition of (Glycine)_2HNO_3 : I. Crystal Structure Determination of Ferro- and Paraelectric Phases

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概要

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• The crystal structures of ferroelectric and paraelectric (Glycine)_2HNO_3 were determined by X-ray as well as by neutron diffraction methods at -150℃ and at room temperature, respectively. One of the glycine molecules has the zwitter-ion configuration and another is mono-protonated. Thus the chemical formula should be written as NH_3^+CH_2COO^-・NH_3^+CH_2COOH・NO_3^-. Both glycine ions as well as the nitrate ion are nearly planar within the experimental error. A short O-H…O bond, about 2.45Å, connects two glycine ions of the different configuration and a proton is attached to the oxygen of the glycinium ion. The paraelectric structure is a disordered one based upon the ferroelectric structure. Such a type of the order-disorder phase transition and the above-mentioned strong hydrogen bond may play an important role for the ferroelectric behaviour of the crystal, which is very similar to the case of (Glycine)_3H_2SO_4.

• 社団法人日本物理学会の論文
• 1968-07-05

著者

• SATO Shoichi

  Institute for Solid State Physics, University of Tokyo

• Sato Shoichi

  Institute For Solid State Physics University Of Tokyo

• Sato Shoichi

  Institute For Solid State Physics The University Of Tokyo

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