Abstract
Abstract 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), and ultraviolet-visible (UV-Vis) diffused reflection spectrum were used to characterize various properties of the obtained solid products. At 180 °C, the reaction proceeds rapidly. With the increase of time, the reflection peaks of unreacted Ta 2 O 5 in the XRD patterns becomes weaker and weaker. Pure NaTaO 3 is obtained after 60 min, which is well crystallized with a uniform cubic morphology.
Published Version
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