| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1627794 | Journal of Alloys and Compounds | 2006 | 7 Pages |
Na2Th(MoO4)3, Na4Th(MoO4)4, Na2Pu(MoO4)3 and Na4Pu(MoO4)4 were prepared by solid state reactions in the required stoichiometric ratio of Th(MoO4)2 or Pu(MoO4)2 with Na2MoO4 at 600 °C. The crystal structure of all the compounds were derived from X-ray powder diffraction data in the tetragonal system by Rietveld profile method. Na2Th(MoO4)3 and Na2Pu(MoO4)3 have scheelite structure, whereas Na4Th(MoO4)4 and Na4Pu(MoO4)4 have super scheelite structure.TG curves of all the four molybdates did not show any weight change up to 950 °C. During the heating and cooling cycle, DTA curve of Na2Th(MoO4)3 showed peaks at 890 and 810 °C due to the melting and solidification, respectively. Similarly Na4Th(MoO4)4 showed peaks at 820 and 750 °C due to melting and solidification of the compound. Both the compounds, when heated in air above 950 °C, decomposed to form mixture of Na2MoO4 and ThO2. Na2Pu(MoO4)3 and Na4Pu(MoO4)4, showed melting peaks at 740 and 705 °C and cooling peaks 570 and 520 °C, respectively. Na2Pu(MoO4)3 and Na4Pu(MoO4)4 when heated at 1400 °C formed the mixture of Na4PuO5 and PuO2.
