Papers - TANIGUCHI Hiroki

Effect of Oxygen Isotope Exchange on Ferroelectric Microregion in SrTiO_3 Studied by Raman Scattering

谷口 博基

Journal of the Physical Society of Japan Vol.73     page： 3262 - 3265   2004

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Language：English   Publishing type：Research paper (scientific journal)  

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2003-05-15

Taniguchi Hiroki, Machida Mitsuo, Koyano Nobumitsu

Journal of the Physical Society of Japan   Vol. 72 ( 5 ) page： 1111-1117   2003.5

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Neutron diffraction study of crystal structures of glycinium phosphite H<inf>3</inf>NCH<inf>2</inf>COOH·H<inf>2</inf>PO<inf>3</inf> in paraelectric and ferroelectric phases Reviewed

Hiroki Taniguchi, Mitsuo Machida, Nobumitsu Koyano

Journal of the Physical Society of Japan   Vol. 72 ( 5 ) page： 1111 - 1117   2003.5

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：THE PHYSICAL SOCIETY OF JAPAN  

Crystal structure of H3NCH2COOH·H 2PO3 was studied in the paraelectric phase (P phase) at 298 K and in the ferroelectric phase (F phase) at 170 K by means of the single crystal neutron diffraction. Two independent protons in the hydrogen bonds forming the H(HPO3)- chains are disordered over two sites with the separations of 0.486(3) and 0.474(5) Å in the P phase. In the F phase, they are ordered at a position nearly equal to one of two sites related by the disorder. With the proton order, lengths of the P-O bonds with the oxygens involved in the hydrogen bonds forming the chain deviate from their values determined in the P phase. A possible mechanism for the appearance of the spontaneous polarization is discussed in connection with the deformation of the HPO32- anions in the F phase. © 2003 The Physical Society of Japan.

DOI： 10.1143/JPSJ.72.1111

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