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Tantalum pentoxide reacts actively with concentrated NaOH solution under hydrothermal conditions at 180 °C. In the reaction between NaOH solution and Ta 2 O 5 , the structure and composition of the tantalates depend on the reaction time, and the structure evolution results in a remarkable change in light absorption. Powder X-ray diffraction (XRD), scanning electron microscopy (SEM),...
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