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

[ Vol. 5 , Issue. 1 ]

Author(s):

Ludwik Gorski, Edward Iller and Marcin Konior   Pages 17 - 22 ( 6 )

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.

Affiliation:

National Centre for Nuclear Research, 05-400 Otwock-Swierk, Poland.

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