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000849928 1001_ $$0P:(DE-Juel1)145894$$aArinicheva, Yulia$$b0$$eCorresponding author
000849928 245__ $$aInfluence of temperature on the dissolution kinetics of synthetic LaPO4-monazite in acidic media between 50 and 130 °C
000849928 260__ $$aAmsterdam [u.a.]$$bElsevier Science$$c2018
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000849928 520__ $$aSingle-phase monazite-type ceramics are discussed as waste forms for the safe disposal of surplus plutonium or separated minor actinides. To gain a deeper insight into the mechanism governing the dissolution of monazite-type compounds, the dissolution kinetics of synthetic LaPO4-monazite was systematically studied by dynamic dissolution experiments carried out in the temperature range from 50 to 130 °C in acidic media (0.01 M HNO3). The dissolution rates at far from equilibrium conditions increased from 3.2 × 10−5 g m−2 d−1 at 50 °C to 2.5 × 10−4 g m−2 d−1 at 130 °C. Two different temperature regions were observed, in which the normalised dissolution rates of LaPO4 have a diverging temperature dependence, indicating two different mechanisms of dissolution: namely surface-controlled dissolution (T = 50–90 °C; Ea = 44 kJ mol−1) and transport-controlled dissolution (T = 90–130 °C; Ea = 7.5 kJ mol−1). Complementary thermodynamic modelling studies of the dissolution of LaPO4 at the experimental conditions show that La-rhabdophane (LaPO4·0.667H2O) is the thermodynamically favoured phosphate phase in aqueous environments below about 100 °C. Apparently, the hydration of monazite and the formation of a thin surface layer consisting of rhabdophane is an intermediate step controlling the dissolution kinetics of the LaPO4 monazite ceramics in low temperature aqueous environments.Keywords
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000849928 7001_ $$0P:(DE-HGF)0$$aGausse, Clemence$$b1
000849928 7001_ $$0P:(DE-Juel1)130389$$aNeumeier, Stefan$$b2
000849928 7001_ $$0P:(DE-Juel1)144040$$aBrandt, Felix$$b3
000849928 7001_ $$0P:(DE-Juel1)144076$$aRozov, Konstantin$$b4
000849928 7001_ $$00000-0003-3691-3621$$aSzenknect, Stéphanie$$b5
000849928 7001_ $$0P:(DE-HGF)0$$aDacheux, Nicolas$$b6
000849928 7001_ $$0P:(DE-Juel1)130324$$aBosbach, Dirk$$b7
000849928 7001_ $$0P:(DE-Juel1)156511$$aDeissmann, Guido$$b8
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