Synthesis, Characterization, and Thermal Kinetics of Mixed Gadolinium: Calcium Heptamolybdate System

<table class="table-group" id="tab4"><tr><td><table class="table"><tr><td class="thead-hr" colspan="5"><hr/></td></tr><tr class="thead"><td align="left" rowspan="2">Stage</td><td align="center" rowspan="2">Temp. (°C)</td><td align="center" rowspan="2">Decomposition step</td><td align="center" colspan="2">Weight loss (%)</td></tr><tr class="thead"><td align="center">Obsv.</td><td align="center">Cal.</td></tr><tr><td class="thead-hr" colspan="5"><hr/></td></tr><tr><td align="left">Ist</td><td align="center">28–440</td><td align="center">
 GdCaMo7O24·8H2O → GdCaMo7O24 + 8H2O</td><td align="center">10.38</td><td align="center">10.31</td></tr><tr><td align="left">IInd</td><td align="center">441–543</td><td align="center">GdCaMo7O24 → GdCaMo6O21 + MoO3</td><td align="center">11.41</td><td align="center">11.49</td></tr><tr><td align="left">IIIrd</td><td align="center">544–666</td><td align="center">GdCaMo6O21 → GdMo6O19 + CaO2</td><td align="center">7.77</td><td align="center">6.49</td></tr><tr class="table-tr"><td colspan="5"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

Results of thermal decomposition for different temperature ranges with observed and calculated weight loss for mixed crystal with composition GdCaMo7O24·8H2O.

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Table 4

Table 4: Synthesis, Characterization, and Thermal Kinetics of Mixed Gadolinium: Calcium Heptamolybdate System 