Neutron powder diffraction patterns were measured for the ordered a-phase and the disordered b-phase of deuterated methanol. The structure of the a-phase at 160 K is in agreement with that found earlier at 15 K. A complete refinement of the structure of the b-phase at 170 K was also carried out. The
Solid-phase transitions in TlHSO4 crystal
β Scribed by N. Le Calve; B. Pasquier; F. Romain; A. Taffin
- Publisher
- John Wiley and Sons
- Year
- 1994
- Tongue
- English
- Weight
- 626 KB
- Volume
- 25
- Category
- Article
- ISSN
- 0377-0486
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Laboratory and synchrotron X-ray powder di4raction and neutron powder di4raction have been used to determine crystal structures in the perovskites SrTi x Zr 1Ψx O 3 . Superlattice re6ections in the neutron di4raction patterns proved to be the most reliable indicators of lower symmetry structures. Th
Phase transition temperatures for solid deuterium bromide are calculated in the effective field approximation. The crystal structure is treated as a twoklimensional lattice of zig-zag chains of DBr molecules. Dipole-dipole and quadrupolequadrupole interactions are included up to second neighbors. in