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Low temperature lattice expansion of americium dioxide

Elsevier B.V.
Publication Date
DOI: 10.1016/0378-4363(80)90178-3


Abstract The variation of the lattice parameter, of the thermal linear expansion, and of the coefficient of thermal linear expansion was determined for AmO 2 in the range 38–300 K. On cooling, AmO 2 contracts more strongly than the dioxides of lower actinides, but similarly strong contraction occurs for CeO 2 and PrO 2− x ; this confirms the observed analogy between Am and the lanthanides. The α self-irradiation causes lattice expansion and reversibly broadens the diffraction lines at low temperatures in both 241AmO 2 and 243AmO 2. The former effect partly anneals at room temperature; the room temperature lattice parameter of previously cooled specimens decreases to a steady state value within some days. A much faster process of defect formation and annealing is responsible for the change in line width; the line width characteristic of a given temperature establishes within a few hours.

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