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Abstract:

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.

Registro:

Documento: Artículo
Título:Thermal decomposition of crystalline NiII-CrIII layered double hydroxide: A structural study of the segregation process
Autor:Sileo, E.E.; Jobbágy, M.; Paiva-Santos, C.O.; Regazzoni, A.E.
Filiación:INQUIMAE, Facultad de Ciencias Exactas y Naturales, Ciudad Universitaria, C1428EHA - Buenos Aires, Argentina
Instituto de Química, Universidade Estadual Paulista, UNESP, Araraquara, 14801-970, Sao Paulo, Brazil
Unidad de Actividad Química, Comisión Nacional de Energía Atómica, Centro Atómico Constituyentes, Avenida General Paz 1499, B1650KNA - San Martin, Argentina
Palabras clave: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
Año:2005
Volumen:109
Número:20
Página de inicio:10137
Página de fin:10141
DOI: http://dx.doi.org/10.1021/jp050639v
Título revista:Journal of Physical Chemistry B
Título revista abreviado:J Phys Chem B
ISSN:15206106
CODEN:JPCBF
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15206106_v109_n20_p10137_Sileo

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Citas:

---------- APA ----------
Sileo, E.E., Jobbágy, M., Paiva-Santos, C.O. & Regazzoni, A.E. (2005) . Thermal decomposition of crystalline NiII-CrIII layered double hydroxide: A structural study of the segregation process. Journal of Physical Chemistry B, 109(20), 10137-10141.
http://dx.doi.org/10.1021/jp050639v
---------- CHICAGO ----------
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" . Journal of Physical Chemistry B 109, no. 20 (2005) : 10137-10141.
http://dx.doi.org/10.1021/jp050639v
---------- MLA ----------
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" . Journal of Physical Chemistry B, vol. 109, no. 20, 2005, pp. 10137-10141.
http://dx.doi.org/10.1021/jp050639v
---------- VANCOUVER ----------
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. J Phys Chem B. 2005;109(20):10137-10141.
http://dx.doi.org/10.1021/jp050639v