Innovations in Corrosion and Materials Science

Formerly Recent Patents on Corrosion Science

Oleg L. Figovsky  
R&D of International Nanotechnology Research Centre
Migdal HaEmek
Israel

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Thermal Stability and Phase Transitions in WO3-ZrO2 and WO3-TiO2 Composites

Author(s): Ludwik Gorski, Edward Iller, Marcin Konior.

Graphical Abstract:


Abstract:

Complex sol-gel process was applied to synthesize WO3-ZrO2 and WO3-TiO2 composites at different ratio of oxides. These composites are used to obtain radionuclide W-Re generators important due to applications in nuclear medicine.

The structure of above composites depends on annealing temperature. At 800 °C specimens are fully crystalline containing separate oxides with crystallites of nanometric sizes. WO3 existing in monoclinic form stabilizes tetragonal ZrO2 form. Long time annealing at 1000 °C causes martensite type phase transition in ZrO2 from tetragonal to monoclinic form whereas in WO3-TiO2 composite in the same conditions phase transitions do not occur.

Keywords: Phase transitions, sol-gel method, W-Re generators, WO3-TiO2, WO3-ZrO2 composites, X-ray diffraction.

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Article Details

VOLUME: 5
ISSUE: 1
Year: 2015
Page: [17 - 22]
Pages: 6
DOI: 10.2174/2352094905666150317233857