Abstract
The thermal decomposition of lanthanide biscitrato chromate (III) hydrates, [Ln(Cr(C6H5O7)2] nH2O whereLn=Pr, Nd, Dy and Ho have been carried out in static air and flowing argon atmospheres and thereby compared the decomposition nature with that of the lanthanum biscitrato chromate(III) dihydrate reported earlier. The precursor complexes decompose in four major steps. Stable oxycarbonates and chromates(V) have been isolated as intermediates. It has been found that for heavier lanthanide complexes all the decomposition steps are pushed to ‘higher temperature’ ranges. Moreover, the thermal stability range of chromates(V) is much lesser compared to that of LaCrO4. Based on the observed experimental results a general scheme for the decomposition of lanthanide biscitrato chromate(III) hydrates is proposed.
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