STRUCTURAL PHASE TRANSITION AND CRYSTAL STRUCTURE FOR (ND4)4D2(SeO4)3 AT LOW TEMPERATURE |
| T. Fukami Department of Physics and Earth Sciences, Faculty of Science University of the Ryukyus, Okinawa 903-0213, Japan and R.H. Chen Department of Physics, National Taiwan Normal University Taipei, Taiwan, 117, Republic of China |
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| Received: May 14, 2001 |
| Differential scanning calorimetry and X-ray diffraction measurements were performed on a deuterated tetraammonium dihydrogen triselenate (ND4)4D2(SeO4)3 crystal at low temperatures. A structural phase transition is found at 182.0(3) K. The space group symmetry (triclinic P1) and the structure parameters are determined at 145 K in the low-temperature phase. The isotope effect for an asymmetric O--H--O hydrogen bond by the substitution of deuterium is discussed. |
| DOI: 10.12693/APhysPolA.100.53 PACS numbers: 61.66.Fn, 64.60.Fr |