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Combustion Method (combustion + method)
Selected AbstractsEnhanced Permeability and Dielectric Constant of NiZn Ferrite Synthesized in Nanocrystalline Form by a Combustion MethodJOURNAL OF THE AMERICAN CERAMIC SOCIETY, Issue 5 2007Sasanka Deka The performance parameters of Ni0.5Zn0.5Fe2O4, synthesized in the nanocrystalline form by an autocombustion method, have been investigated. The sample sintered at 1200°C, with Bi2O3 as additive shows a very high value of initial permeability ,,i of >400 at 1 MHz, with low loss. Similarly, a very high dielectric constant is obtained at lower frequencies. The results show that optimum magnetic and electrical properties can be achieved for the NiZn ferrite nanocrystalline powders synthesized by the present autocombustion method and sintered at a relatively lower temperature of 1200°C when compared with a temperature of 1400°C required for the materials synthesized by the conventional ceramic method. [source] ChemInform Abstract: Synthesis and Characterization of LaAlO3 Nanopowders by Emulsion Combustion Method.CHEMINFORM, Issue 39 2009J. Chandradass Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source] Synthesis, characterization and dielectric properties of EuBa2SbO6 nanocrystalsCRYSTAL RESEARCH AND TECHNOLOGY, Issue 6 2010V. T. Kavitha Abstract Nanoparticles of EuBa2SbO6, a complex perovskite metal oxide were synthesized by a self-sustained combustion method employing citric acid as the complexing agent. The powders were characterized by X-ray diffraction, IR and Raman spectroscopy, transmission electron microscopy and scanning electron microscopy. Nanocrystals of EuBa2SbO6 were sintered to 97 % of theoretical density at 1450 °C for 4 h without any sintering aid. The dielectric properties (dielectric constant, ,r and loss factor, tan,) of the ceramics have been measured in the frequency range 50 Hz to 5 MHz at room temperature. The chemical non-reactivity of EuBa2SbO6 with YBa2Cu3O7-, makes it an ideal substrate for YBa2Cu3O7-, superconductors. (© 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source] Evaluation of the sealed-tube low-temperature combustion method for the 13C/12C and 2H/1H ratio determinations of cellulose nitrateCHINESE JOURNAL OF CHEMISTRY, Issue 11 2001Fa-Xiang Tao Abstract Traditionally-suggested combustion time of 1 h at 550°C) with the sealed-tube combustion method for determining the 13C/ 12C ratio of cellulose nitrate or other nitrogen-containing components could produce large negative deviation up to 1°. Three types of cellulose are used to ascertain possible causes. The presence of nitrous oxide (N2O) formed during combustion is most likely responsible for this deviation. Prolongation of the combustion time (at least 5 h at 550°C) and intimate contact between copper oxide and organic matter can greatly improve the analysis precision and effectively reduce this deviation to an acceptable level. Regardless of scattered carbon isotope data, hydrogen isotope data are all reproducible within 2° when this method is coupled with the high temperature uranium reduction method. Thus, care should be taken for determining carbon and nitrogen isotope compositions of nitrogen-containing substances using the low temperature sealed-tube combustion method. [source] | ||||||||||