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Formation of oxysulfide LnO2S2 and oxysulfate LnO2SO4 phases in the thermal decomposition process of lanthanide sulfonates (Ln = La, Sm)

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Abstract

This study investigates two lanthanide compounds (La3+ and Sm3+) obtained in water/ethyl alcohol solutions employing the anionic surfactant diphenyl-4-amine sulfonate (DAS) as ligand. Both sulfonates were characterized through IR, TG/DTG (O2 and N2). The thermal treatment of both compounds at 1273 K under air leaves residues containing variable percentages of lanthanide oxysulfide/oxysulfate phases shown by synchrotron high-resolution XRD pattern including the Rietveld analysis. The phase distributions found in the residues evidence the differences in the relative stability of the precursors.

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Acknowledgements

We are especially grateful to the Brazilian Synchrotron Light Laboratory (LNLS) Campinas.

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Authors and Affiliations

  1. Laboratório de Produção de Novos Materiais, Departamento de Química, UFES, Av. Fernando Ferrari, 574, Vitória, ES, 29075-910, Brazil

    Luiz Carlos Machado

  2. Laboratório de Física Aplicada, Departamento de Física, UFES, Av. Fernando Ferrari, 574, Vitória, ES, 29075-910, Brazil

    Marcos Tadeu D’Orlando de Azeredo

  3. Laboratório de Cátalise e Cerâmicas Avançadas, UFMS, Campo Grande, Brazil

    Hamilton Perez Soares Corrêa

  4. Laboratório de Análise Térmica Prof. Ivo Giolito, Instituto de Química, USP, Av. Prof. Lineu Prestes 748, Bloco 8T, São Paulo, SP, 05508-000, Brazil

    Jivaldo do Rosário Matos

  5. Laboratório de Química do Estado Sólido, Instituto de Química, Unicamp, 6154, Campinas, SP, 13084-971, Brazil

    Ítalo Odone Mazali

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  1. Luiz Carlos Machado
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  2. Marcos Tadeu D’Orlando de Azeredo
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Correspondence to Luiz Carlos Machado.

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Machado, L.C., de Azeredo, M.T.D., Corrêa, H.P.S. et al. Formation of oxysulfide LnO2S2 and oxysulfate LnO2SO4 phases in the thermal decomposition process of lanthanide sulfonates (Ln = La, Sm). J Therm Anal Calorim 107, 305–311 (2012). https://doi.org/10.1007/s10973-011-1451-7

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  • DOI: https://doi.org/10.1007/s10973-011-1451-7

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