Abstract
The paper investigates the phase formation in the GdPO4-YPO4-H2O system. The effect of the system composition on the structural, dimensional, and thermal characteristics of rhabdophane- and xenotime-based phases with variable composition has been studied. The precipitation from solutions at pH = 1 was shown to result in the YPO4 crystallization in the xenotime phase. Hydrothermal treatment at pH = 1 leads to the crystallization of two – rhabdophane- and xenotime-structured solid solutions. The region of two Gd1−xYxPO4·(nH2O) solid solutions coexistence is limited by compositions in the 0.68 ≤ x ≤ 0.75 range. An increase in the proportion of yttrium in the rhabdophane structure was shown to increase the temperature of transformation into the monazite phase. According to thermal analysis, the number of water molecules per formula unit of the rhabdophane structure is about 0.5 and is almost independent of the composition.
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