Abstract
Double orthophosphates of actinides and alkali metals AIM2IV(PO4)3, where MIV = U, Np, or Pu; AI = Na, K, or Rb, are studied by X-ray diffraction. Rhombohedral modifications (β-forms) formed from the low-temperature monoclinic modifications (α-forms) on heating in the range 600-1650°C are examined. The α → β transition temperature depends on particular alkali metal and actinide. The crystallographic parameters of the complexes are tabulated. The trends in variation of the unit cell parameters in relation to the ionic radii of alkali metals and actinides are discussed.
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