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

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

Volume: 5 Issue: 1

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

Affiliation:

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

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.

Cite this article as:

Gorski Ludwik, Iller Edward and Konior Marcin, Thermal Stability and Phase Transitions in WO₃-ZrO₂ and WO₃-TiO₂ Composites, Innovations in Corrosion and Materials Science (Discontinued) 2015; 5 (1) . https://dx.doi.org/10.2174/2352094905666150317233857

DOI https://dx.doi.org/10.2174/2352094905666150317233857	Print ISSN 2352-0949
Publisher Name Bentham Science Publisher	Online ISSN 2352-0957