Neutron diffraction refinement of CsHSO4 superionic phase structure
Abstract
The supersonic phase structure of the crystal CsHSO4 (T sub c approx = 414 K) was determined from neutron diffraction data. The volume centered tetragonal structure (sp.gr. I4(sub 1) and, a=5.718 A, c=14.232 A) is in the state of dynamical disorder: the tetrahedron SO4 occupies two positions with a tilting of + or - 20 deg around the c axis, the hydrogen atoms connect the tetrahedrons in the chain the direction of the (111) type. The proton conductivity proceeds by jump diffusion for the distances of 2.85 A, and 3.60 A along the (100) and (001) directions, respectively. With reducing temperature the subgroup phase transition occurs with one of the states being being frozen.
- Publication:
-
Unknown
- Pub Date:
- 1987
- Bibcode:
- 1987ndrc.rept.....B
- Keywords:
-
- Molecular Structure;
- Neutron Diffraction;
- Superlattices;
- High Temperature;
- Hydrogen Compounds;
- Ions;
- Phase Transformations;
- Superconductivity;
- Solid-State Physics