Preparation and Property Characteristics of Non-agglomerated HfO_2 Nano Powders by Wet Chemical Method
Source abstract
Abstract
HfO2 nano powders were prepared by the chemical precipitant method. The influence of different preparation parameters on the agglomeration was-investigated by X-ray diffraction analysis (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), BET surface area techniques and laser particle analyzer. Non-agglomerated orthorhombic, HfO2 powders with a size of about 25nm can be obtained by controlling starting concentration and pH values of solution, adding surfactants, washing gels with alcohol and calcining at 700℃. Orthorhombic HfO2 ceramics of 96% theoretical density can be prepared by sintering at 1800℃ for 2h in hydrogen. The results show that there are both o-HfO2 and m-HfO2 in the sample, mainly o-HfO2.
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Research context
OpenAlex topics: Semiconductor materials and devices · Catalytic Processes in Materials Science · Machine Learning in Materials Science
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