Ordering of deuterium in PdD<sub>0.65</sub> at 54 K
S J Kennedy; E Wu; E H Kisi; E M Gray; B J Kennedy; S J Kennedy; Neutron Scattering Group, Australian Nucl. Sci. & Technol. Organ., Menai, NSW, Australia; E Wu; Neutron Scattering Group, Australian Nucl. Sci. & Technol. Organ., Menai, NSW, Australia; E H Kisi; Neutron Scattering Group, Australian Nucl. Sci. & Technol. Organ., Menai, NSW, Australia; E M Gray; Neutron Scattering Group, Australian Nucl. Sci. & Technol. Organ., Menai, NSW, Australia; B J Kennedy; Neutron Scattering Group, Australian Nucl. Sci. & Technol. Organ., Menai, NSW, Australia
Журнал:
Journal of Physics: Condensed Matter
Дата:
1995-01-23
Аннотация:
Neutron powder diffraction studies on PdD<sub>0.65</sub> demonstrate that the 50 K anomaly is due to an order-disorder transition of deuterium within octahedral interstitial sites. The slow transition to the ordered phase involves diffusion of deuterium from the nearest-neighbour deuterium positions to the second-nearest-neighbour positions. The ordered crystal structure remains cubic, and is accurately described in space group Pm3n by doubling the cell constant relative to the disordered structure (space group Fm3m).
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