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.
1. Machida, M, Kawamura, K, Ito, K, Ikeue, K. Large-capacity oxygen storage by lanthanide oxysulfate/oxysulfide systems. Chem Mater. 2005;17:1487–1492. .
2. Machida, M, Kawano, T, Eto, M, Zhang, D, Ikeue, K. Ln dependence of the large-capacity oxygen storage/release property of Ln oxysulfate/oxysulfide systems. Chem Mater. 2007;19:954–960. .
3. Ikeue, K, Kawano, T, Eto, M, Zhang, D, Machida, M. X-ray structural study on the different redox behaviors of La and Pr oxysulfates/oxysulfides. J Alloys Compd. 2008;451:338–340. .
4. Llanos, J, Sánchez, V, Mujica, C, Buljan, A. Synthesis, physical and optical properties, and electronic structure of the rare-earth oxysulfides Ln2O2S (Ln=Sm, Eu). Mater Res Bull. 2002;37:2285–2291. .
5. Llanos, J, Mujica, C, Henriquez, A, Gómez-Romero, P, Molins, E. Structure refinement of samarium monothio oxide. J Alloys Compd. 2001;316:90–92. .
6. Zhao, F, Yuan, M, Zhang, W, Gao, S. Monodisperse lanthanide oxysulfide nanocrystals. J Am Chem Soc. 2006;128:11758–11759. .
7. Casari, BM, Langer, V. Two Ce(SO4)2·4H2O polymorphs: crystal structure and thermal behavior. J Solid State Chem. 2007;180:1616 .
8. JA Poston Jr , Siriwardane, RV, Fisher, EP, Miltz, AL. Thermal decomposition of the rare earth sulfates of cerium(III), cerium(IV), lanthanum(III) and samarium(III). Appl Surf Sci. 2003;214:83–102. .
9. Machado, LC, Marins, AAL, Muri, EJB, Lacerda, JAS, Balthar, VO, Fulvio, PF, de Freitas, JCC. Reaction products between sodium diphenyl-4-amine sulfonate and hydrated LaCl3: thermogravimetric and spectroscopic study. J Therm Anal Calorim. 2004;75:615–621. .
10. Machado, LC, Marins, AAL, Muri, EJB, Biondo, A, Matos, JdoR, Mazali, IO. Complexation of the Fe(III) and Fe(II) sulphates with diphenyl-4-amine barium sulphonate (DAS): Synthesis, thermogravimetric and spectroscopic studies. J Therm Anal Calorim. 2009;97:289–296. .
11. Young RA . The Rietveld method. Oxford: Oxford University Press; 1993.
12. Larson, AC, Von Dreele, B. General structure analysis system (GSAS) (report LAUR 86–748). Los Alamos: Los Alamos National Laboratory; 2000.
13. Toby, BH. EXPGUI, a graphical user interface for GSAS. J Appl Crystallogr. 2001;34:210–213. .
14. Thompson, P, Cox, DE, Hastings, JB. Rietveld refinement of Debye-Scherrer synchrotron X-ray data from Al2O3. J Appl Crystallogr. 1987;20:79–83. .
15. Finger, LW, Cox, DE, Jephcoat, AP. A correction for powder diffraction peak asymmetry due to axial divergence. J Appl Crystallogr. 1994;27:892–900. .
16. Stephens, PW. Phenomenological model of anisotropic peak broadening in powder diffraction. J Appl Crystallogr. 1999;32:281–289. .
17. Beentjes, PCJ, Van Den Brand, J, De Wit, JHW. Interaction of ester and acid groups containing organic compounds with iron oxide surface. J Adhes Sci Technol. 2006;20:1–18. .
18. Zhang, H, Wen, X, Wang, Y. Synthesis and characterization of sulfate and dodecylbenzene sulfonate intercalated zinc-iron layered double hydroxides by one-step coprecipitation. J Solid State Chem. 2007;180:1636–1647. .
19. Nakanishi, K, Solomon, PH. Infrared absorption spectroscopy. San Francisco: Holden-Day; 1977.
20. Bellamy, LJ. The infrared spectra of complex molecules. London: Chapman and Hall; 1980.
21. Braterman, PS, Xu, ZP. High affinity of dodecylbenzene sulfonate for layered double hydroxide and resulting morphological changes. J Mater Chem. 2003;13:268–273. .
22. Wang, M, Song, ZG, Jiang, H, Gong, H. Thermal decomposition of metal methanesulfonates in air. J Therm Anal Calorim. 2009;98:801–806. .