Thermal decomposition of crystalline NiII-CrIII layered double hydroxide: A structural study of the segregation process
A structural study of the thermal evolution of Ni0.69Cr 0.31(OH)2(CO3)0.155·nH 2O into NiO and tetragonal NiCr2O4 is reported. The characteristic structural parameters of the two coexisting crystalline phases, as well as their relative abundance, were determined by Rietveld refinement of powder x-ra...
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| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_15206106_v109_n20_p10137_Sileo |
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todo:paper_15206106_v109_n20_p10137_Sileo2023-10-03T16:20:07Z Thermal decomposition of crystalline NiII-CrIII layered double hydroxide: A structural study of the segregation process Sileo, E.E. Jobbágy, M. Paiva-Santos, C.O. Regazzoni, A.E. Chromium compounds Computer simulation Crystal structure Crystalline materials Crystallization Pyrolysis Solutions Urea Water X ray powder diffraction Cationic redistribution Crystalline spinels Layered double hydroxides (LDH) Rietveld refinement Nickel compounds A structural study of the thermal evolution of Ni0.69Cr 0.31(OH)2(CO3)0.155·nH 2O into NiO and tetragonal NiCr2O4 is reported. The characteristic structural parameters of the two coexisting crystalline phases, as well as their relative abundance, were determined by Rietveld refinement of powder x-ray diffraction (PXRD) patterns. The results of the simulations allowed us to elucidate the mechanism of the demixing process of the oxides. It is demonstrated that nucleation of a metastable nickel chromite within the common oxygen framework of the parent CrIII-doped bunsenite is the initial step of the cationic redistribution. The role that trivalent cations play in the segregation of crystalline spinels is also discussed. © 2005 American Chemical Society. Fil:Sileo, E.E. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Jobbágy, M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_15206106_v109_n20_p10137_Sileo |
| institution |
Universidad de Buenos Aires |
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I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Chromium compounds Computer simulation Crystal structure Crystalline materials Crystallization Pyrolysis Solutions Urea Water X ray powder diffraction Cationic redistribution Crystalline spinels Layered double hydroxides (LDH) Rietveld refinement Nickel compounds |
| spellingShingle |
Chromium compounds Computer simulation Crystal structure Crystalline materials Crystallization Pyrolysis Solutions Urea Water X ray powder diffraction Cationic redistribution Crystalline spinels Layered double hydroxides (LDH) Rietveld refinement Nickel compounds Sileo, E.E. Jobbágy, M. Paiva-Santos, C.O. Regazzoni, A.E. Thermal decomposition of crystalline NiII-CrIII layered double hydroxide: A structural study of the segregation process |
| topic_facet |
Chromium compounds Computer simulation Crystal structure Crystalline materials Crystallization Pyrolysis Solutions Urea Water X ray powder diffraction Cationic redistribution Crystalline spinels Layered double hydroxides (LDH) Rietveld refinement Nickel compounds |
| description |
A structural study of the thermal evolution of Ni0.69Cr 0.31(OH)2(CO3)0.155·nH 2O into NiO and tetragonal NiCr2O4 is reported. The characteristic structural parameters of the two coexisting crystalline phases, as well as their relative abundance, were determined by Rietveld refinement of powder x-ray diffraction (PXRD) patterns. The results of the simulations allowed us to elucidate the mechanism of the demixing process of the oxides. It is demonstrated that nucleation of a metastable nickel chromite within the common oxygen framework of the parent CrIII-doped bunsenite is the initial step of the cationic redistribution. The role that trivalent cations play in the segregation of crystalline spinels is also discussed. © 2005 American Chemical Society. |
| format |
JOUR |
| author |
Sileo, E.E. Jobbágy, M. Paiva-Santos, C.O. Regazzoni, A.E. |
| author_facet |
Sileo, E.E. Jobbágy, M. Paiva-Santos, C.O. Regazzoni, A.E. |
| author_sort |
Sileo, E.E. |
| title |
Thermal decomposition of crystalline NiII-CrIII layered double hydroxide: A structural study of the segregation process |
| title_short |
Thermal decomposition of crystalline NiII-CrIII layered double hydroxide: A structural study of the segregation process |
| title_full |
Thermal decomposition of crystalline NiII-CrIII layered double hydroxide: A structural study of the segregation process |
| title_fullStr |
Thermal decomposition of crystalline NiII-CrIII layered double hydroxide: A structural study of the segregation process |
| title_full_unstemmed |
Thermal decomposition of crystalline NiII-CrIII layered double hydroxide: A structural study of the segregation process |
| title_sort |
thermal decomposition of crystalline niii-criii layered double hydroxide: a structural study of the segregation process |
| url |
http://hdl.handle.net/20.500.12110/paper_15206106_v109_n20_p10137_Sileo |
| work_keys_str_mv |
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1807319321729302528 |