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J. Phys. Soc. Jpn. 25 (1968) pp. 185-201  |Next Article|  |Table of Contents|
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Crystal Structure and Phase Transition of (Glycine)2HNO3 I. Crystal Structure Determination of Ferro- and Paraelectric Phases

Shoichi Sato

Institute for Solid State Physics, University of Tokyo

(Received March 18, 1968)

The crystal structures of ferroelectric and paraelectric (Glycine)2HNO3 were determined by X-ray as well as by neutron diffraction methods at -150°C 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 NH3+CH2COO-·NH3+CH2COOH·NO3-. 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)3H2SO4. ©1968 The Physical Society of Japan

URL: http://jpsj.ipap.jp/link?JPSJ/25/185/
DOI: 10.1143/JPSJ.25.185


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