Nanocrystalline pirochromite spinel through solution combustion synthesis

被引：20

作者：

de Andrade, M. J. ^{[1
]}

Lima, M. D. ^{[1
]}

Bonadiman, R. ^{[1
]}

Bergmann, C. P. ^{[1
]}

机构：

[1] Univ Fed Rio Grande do Sul, Dept Mat Engn, BR-90035190 Porto Alegre, RS, Brazil

来源：

MATERIALS RESEARCH BULLETIN | 2006年 / 41卷 / 11期

关键词：

nanostructures; oxides; chemical synthesis; x-ray diffraction; electron microscopy;

D O I：

10.1016/j.materresbull.2006.04.002

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The production of magnesium-chromium oxides by solution combustion synthesis was investigated using glycine and urea for the first time. Ammonium dichromate, urea/glycine and ammonium nitrate aqueous solutions were used as the precursors of the oxides. The effect of different reaction parameters, such as fuel richness, stoichiometry and fuel leanness was evaluated; such parameters were modified by changing the reagents and the fuel/oxidant ratio. The results suggest that glycine is an interesting complexing/combustible agent for ammonium dichromate to produce chromite spinel. Addition of extra ammonium nitrate to stoichiometric compositions improved the specific surface area and reduced the crystallite size. The highest specific surface area (153.40 m(2)/g) was obtained for the stoichiometric fuel/oxidant mixtures containing glycine as combustible in combination with ammonium nitrate; however, the smallest crystallite size (approximately 9 nm) of Pirochromite (MgCr2O4) was synthesized using urea as combustible. (c) 2006 Elsevier Ltd. All rights reserved.

引用

页码：2070 / 2079

页数：10

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