Structure and properties of mechanochemically synthesized dysprosium titanate Dy2TiO5

• Published in: Journal of nuclear materials Vol. 495; pp. 38 - 48
• Main Authors: Eremeeva, Zh.V., Panov, V.S., Myakisheva, L.V., Lizunov, A.V., Nepapushev, A.A., Sidorenko, D.A., Vorotilo, S.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.11.2017; Elsevier BV
• Subjects: Amorphous dysprosium titanate; Annealing; Chemical elements; Depletion; Differential scanning calorimetry; Dysprosium; Dysprosium compounds; Homogeneous structure; Honeycomb construction; Low temperature; Mechanochemical synthesis; Metastable phases; Neutron absorbers; Oxides; Porosity; Raman spectroscopy; Raw materials; Sintering; Sintering (powder metallurgy); Spectroscopy; Studies; Titanates; Titanium dioxide; Amorphous dysprosium titanate; Mechanochemical synthesis; Neutron absorbers
• ISSN: 0022-3115; 1873-4820
• DOI: 10.1016/j.jnucmat.2017.07.058

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.