Successive Phase Transitions in (NH4)3H(SO4)2 and (ND4)3D(SO4)2 Crystals Studied by EPR of the VO2+ Ion and SeO Radical
β Scribed by J. Minge; S. Waplak
- Publisher
- John Wiley and Sons
- Year
- 1984
- Tongue
- English
- Weight
- 703 KB
- Volume
- 123
- Category
- Article
- ISSN
- 0370-1972
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π SIMILAR VOLUMES
The structure of (NH 4 ) 4 H 2 (SeO 4 ) 3 and (ND 4 ) 4 D 2 (SeO 4 ) 3 superionic crystals below 180 K determined by X-ray singlecrystal analysis is presented. The compounds have the following crystal data: (NH 4 ) 4 H 2 (SeO 4 ) 3 (T β«Ψβ¬ 140 K), triclinic, space group P-1, a β«Ψβ¬ 7.647(2) A s , b β«Ψ
The space group of (ND 4 ) 3 D(SO 4 ) 2 and (NH 4 ) 3 H(SO 4 ) 2 was reported in the literature to be A2/a at the room temperature phase. However, several new Bragg reflections which violated the extinction rule of the a-glide symmetry of the space group A2/a were found by neutron scattering experim