A simple way to prepare nanosized LaFeO3 powders at room temperature

Nanosized LaFeO3 powders of 30 nm particle size were directly prepared by sol-gel auto-combustion at room temperature. The overall process involves three steps: formation of homogeneous sol; formation of dried gel; and combustion of the dried gel. Experiments revealed that LaFeO3 dried gel derived f...

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Bibliographic Details
Published in:Ceramics international 2003, Vol.29 (3), p.347-349
Main Authors: Qi, X, Zhou, J, Yue, Z, Gui, Z, Li, L
Format: Article
Language:English
Subjects:
Chemistry
Colloidal state and disperse state
Elements and non-metal compounds (oxides, hydroxides, hydrides, sulfides, carbides, ...)
Exact sciences and technology
General and physical chemistry
Inorganic chemistry and origins of life
Powders
Preparations and properties
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Summary:Nanosized LaFeO3 powders of 30 nm particle size were directly prepared by sol-gel auto-combustion at room temperature. The overall process involves three steps: formation of homogeneous sol; formation of dried gel; and combustion of the dried gel. Experiments revealed that LaFeO3 dried gel derived from citrate and nitrate sol exhibits self-propagating combustion at room temperature once it is ignited in air. After auto-combustion, the gel directly transforms into nanosized LaFeO3 particles. The autocombustion was considered as a heat-induced exothermic oxidation-reduction reaction between nitrate ions and carboxyl group. Differential thermal analysis-thermogravimetry (DTA-TG) was used to study the decomposition of the precursor. The structure of the nanosized LaFeO3 powders was characterized by X-ray diffraction (XRD).
ISSN:0272-8842
1873-3956
DOI:10.1016/S0272-8842(02)00119-0