Estudio de la estabilidad de fases en el sistema Zn – Cr – O a partir de síntesis por combustión en solución
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Fecha
2017
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Corporación Universitaria Lasallista
Resumen
Introduction. Compounds with transition metals
in their structure generate great interest due to
their physical properties, especially their magnetic
and electric ones. The spinel ZnCr O2 4 has been
characterized by its potential uses as photocatalyst
and as CO2
, sensing material, which has current
relevance and has motivated to learn about new
methods for obtaining it and for justifying studies that
allow to understand the thermodynamic characteristics
for its formation. Objective. Study phase stability
ZnCr O2 4 with the coexistence of secondary phases
formed through thermal treatments. Materials and
methods. From the homogenization of glycine and
nitrates (zinc and chrome), an amorphous compound
was synthetized by combustion in solution. After
thermal treatments (750, 850 and 950 °C), the
compound presented crystalline ordering. Results.
After obtaining the compound, the morphology of the
powders was evaluated through scanning electronic
microscopy (SEM) and their composition was also
evaluated (EDS). The presence of organic material
was determined and a thermal characterization was
made (TGA and DSC) to define the phase formation
temperature. Next, the structures were evaluated
and compared through X-ray diffraction (XRD). Using
simulations in the FactSage® software the results were
compared to verify phase equilibrium. Conclusion.
Through the solution combustion method, a noncrystalline
structure is obtained, formed by Zn, Cr and O, confirming the presence of C associated to the
organic component after combustion.
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Palabras clave
Corporación Universitaria Lasallista, Combustión en solución, Tratamiento térmico, Espinela, Fotocatalizador, Compuestos
Citación
Revista Lasallista de Investigación Vol. 14 N. 2