The study of combustion synthesis of fine-particle γ-lithium aluminate

• Published in: Journal of materials science 2003-09, Vol.38 (18), p.3883-3888
• Main Authors: Lin, Wei, Bai, Xinde, Ling, Yunhan, Yang, Jinlong, Ma, Wenjun
• Format: Article
• Language: English
• Subjects: Aluminum; Chemical synthesis; combustion synthesis; Chemistry; Citric acid; Colloidal state and disperse state; Combustion products; Combustion synthesis; Cross-disciplinary physics: materials science; rheology; Diffraction patterns; Exact sciences and technology; General and physical chemistry; Lithium; Materials science; Materials synthesis; materials processing; Metal nitrates; Oxidation; Oxidizing agents; Particle size distribution; Physics; Pore size distribution; Porosity; Powders; Reaction time; Scanning electron microscopy; Thermochemistry; Ureas; X ray powder diffraction
• ISSN: 0022-2461; 1573-4803
• DOI: 10.1023/A:1025917224740

Fine-particle γ-lithium aluminate has been prepared by the combustion of mixtures of the metal nitrates, M(NO3)x(M = Li, Al) as oxidizers and urea and citric acid as fuels, at low temperature and short reaction time. The combustion products were identified from X-ray powder diffraction (XRD) patterns, scanning electron microscopy (SEM), and pore size distribution measurements. As the total composition of oxidizing and reducing elements of the reactants leave related to the thermochemistry of the system, a simple method of calculating the elemental stoichiometric coefficient was introduced. The physical significance of such a correlation based on thermochemical reasoning was investigated. It was found that a significant improvement was achieved in the reactant mixture with a molar ratio of urea:citric acid = 9:1. An improvement in the combustion synthesis of γ-lithium aluminate is due to the formation of an activated complex of the fuel with the corresponding oxidizer.