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The hydrated rare earth orthophosphates LnPO4 ·xH2O (Ln=La-Dy) contain zeolitic water in the structural channels, which is released reversibly up to 300°. The thermal stabilities of the hydrates depend upon the nature of the Ln atom. The dehydration temperature decreases with decreasing ionic radiusr of Ln3+, according to the general equationθ=(r−a)/b (whereθ is the DSC and/or DTG dehydration peak temperature, anda andb are empirical constants depending on the experimental conditions).

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