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  • 1 University of Calicut, Calicut University Department of Physics P.O. Box 673 635 India P.O. Box 673 635 India
  • 2 Mahatma Gandhi University, Kottayam School of Pure and Applied Physics Kerala 686 560 India Kerala 686 560 India
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Mixed rare earth hydrogen selenite crystals, neodymium praseodymium hydrogen selenite (NdxPr1−x(HSeO3)(SeO3)⋅2H2O), Neodymium samarium hydrogen selenite (NdxSm1−x(HSeO3)(SeO3)⋅2H2O) and praseodymium samarium hydrogen selenite (PrxSm1−x(HSeO3)(SeO3)⋅2H2O) were prepared by gel diffusion technique. Simultaneous thermogravimetric and differential thermal analysis were carried out on the grown crystals. Decomposition is observed to occurs in six steps, which gives the evidence of successive losses of H2O and SeO2. The final product due to decomposition is a mixed rare earth oxides. FT-IR spectrum of the crystal samples heated at different temperatures complemented to the TG-DTA results.