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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Detalles Bibliográficos
Autores principales: Sileo, Elsa Ester, Jobbagy, Matias
Publicado: 2005
Materias:
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
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15206106_v109_n20_p10137_Sileo
http://hdl.handle.net/20.500.12110/paper_15206106_v109_n20_p10137_Sileo
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_15206106_v109_n20_p10137_Sileo
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spelling paper:paper_15206106_v109_n20_p10137_Sileo2023-06-08T16:18:53Z Thermal decomposition of crystalline NiII-CrIII layered double hydroxide: A structural study of the segregation process Sileo, Elsa Ester Jobbagy, Matias 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. 2005 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15206106_v109_n20_p10137_Sileo http://hdl.handle.net/20.500.12110/paper_15206106_v109_n20_p10137_Sileo
institution Universidad de Buenos Aires
institution_str 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, Elsa Ester
Jobbagy, Matias
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.
author Sileo, Elsa Ester
Jobbagy, Matias
author_facet Sileo, Elsa Ester
Jobbagy, Matias
author_sort Sileo, Elsa Ester
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
publishDate 2005
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15206106_v109_n20_p10137_Sileo
http://hdl.handle.net/20.500.12110/paper_15206106_v109_n20_p10137_Sileo
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AT jobbagymatias thermaldecompositionofcrystallineniiicriiilayereddoublehydroxideastructuralstudyofthesegregationprocess
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