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In this work, TiO2 nanoparticles doped with holmium (III) ion have been prepared by an ultrasonic assistant sol-gel method. We present the results of the investigation of holmium (III) ion doping on the structural properties of TiO2 and its effect on the anatase to rutile phase transformation. It is found that the transformation temperature, measured from the XRD experiments, is found to increase...
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