Add time:08/10/2019         Source:sciencedirect.com

We obtained the amorphous dysprosium titanate nanopowders by the means of mechanochemical synthesis using a low-temperature modification of titania and dysprosium oxide as raw materials.TEM, SAED, XRD and Raman spectroscopy data show that complete transformation of initial oxides into X-ray amorphous dysprosium titanate (Dy2TiO5) occurs after the mechanochemical treatment of a mixture of oxides during 30 min.Differential Scanning Calorimetry data suggests the possibility of formation of metastable phases (not indicated in the Dy2O3-TiO2 phase diagram) during the annealing of amorphous dysprosium titanate.The specimen produced by nanopowder sintering had a honeycomb structure with ordered porosity, whereas the specimen produced by commercial powder sintering had a homogeneous structure.Dysprosium depletion was observed for sintered specimens, produced both from commercial and mechanochemically synthesized dysprosium titanate powders; for commercial powder, depletion was 10 times higher than for the mechanochemically synthesized one.

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