Thermal and X-ray diffraction investigations of some lanthanum(III) and neodymium(III) oxide-alkali persulfate binary systems |
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| Authors: | Jalil R Igal Fadhil Jasim |
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| Institution: | Department of Chemistry, College of Science, University of Baghdad, Baghdad Iraq |
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| Abstract: | Different molar ratios of La2O3 or Nd2O3:Na2/K2S2O8 have been prepared, and the results of their TG and DTA investigations, under an atmosphere of static air, are reported. The effects of either La2O3 or Nd2O3 on the thermal decomposition of the persulfates from ambient to 1050°C, using a derivatograph, have been studied. It has been found that La2O3 lowers the initial decomposition temperatures of these alkali persulfates through catalytic activity. Nd2O3 shows little or no catalytic effect and therefore it acts as an insulator. Intermediate and final products are identified by X-ray diffraction analysis. The stoichiometric molar ratios of the solid state reactions are 1:3::R2O3:M2S2O8. (R = La or Nd. M = Na or K), which give double salts of formulae: NaLa(So4)2, KLa(SO4)2, NaNd(SO4)2, and KNd(SO4)2. No sulfates or oxysulfates of lanthanum or neodymium have been identified. |
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| Keywords: | To whom correspondence should be addressed |
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