Preparation of nanostructured Zn–Cr–O spinel powders by ultrasonic spray pyrolysis

Marinković, Zorica V.; Mančić, Lidija; Marić, Radenka; Milošević, Olivera

doi:10.1016/s0955-2219(01)00170-4

Cited by 35 publications

(25 citation statements)

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“…Particle size measurements, performed for all investigated samples, show the same value of mean particle size, estimated to be 470nm, indicating that residence time did not affect a broadening of the particle size distributions [4].…”

Section: Resultsmentioning

confidence: 66%

“…Thermal analysis of mixed precursor salts shows that precursor decomposition is complete at a temperature below 350 o C [4]. Having in mind specific mechanisms of particle formation during the spray pyrolysis process, as well as the fact that spinel phase formation during conventional solid-state reaction process occurs at temperatures higher than 1000 o C [8], a temperature of 900 o C is chosen as a maximum temperature for the synthesis process.…”

Section: Resultsmentioning

confidence: 99%

“…ZnCr 2 O 4 spinel was synthesized according to a previously described method [4]. The precursor solution for atomization was prepared by dissolving the appropriate amounts of corresponding metal nitrates Zn(NO 3 ) 2 x6H 2 O and Cr(NO 3 ) 3 x9H 2 O in distilled water, in order to obtain 0.03mol/dm 3 .…”

Section: Methodsmentioning

confidence: 99%

“…The structure of spinel oxide is responsible for a variety of interesting properties [2][3][4][5][6]. Determination of cation distribution is of considerable relevance because the theoretical interpretation of the chemical and physical properties of these compounds depends on this distribution [5].…”

Section: Introductionmentioning

confidence: 99%

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Morphology, Structure and Nonstoichiometry of ZnCr2O4 Nanophased Powder

Mančić

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et al. 2003

Sensors

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It is well established that gas/humidity-sensing properties of spinels are markedly influenced by their stoichiometry and microstructure. In this work nucleation and spinel phase development in the Zn-Cr-O system were investigated from the viewpoint of structural and morphological phenomena occurred during nanophased particle synthesis through aerosol reaction. The aerosol was generated from nitrates precursor solution using ultrasonic atomizer operated at 1.7 MHz. The influence of different decomposition schedules on the particle chemical content and morphology was determined by adjusting the processing parameters (aerosol droplet density 3.9x10 6 droplets/cm 3 , droplet velocity 0.035m/s, max. temperature 900 o C and residence times 3, 6 and 9s). A composite particle structure comprised of primary crystallites sized from 22 to 44nm is revealed by SEM and TEM analysis. XRD structural analysis (crystallite size, microstrains, unit cell and ionic occupancies) is performed in accordance with procedure based on Koalariet-Xfit program. A certain degree of non-stochiometry is characteristic for all powders. Homogenous distribution of the constituting elements and Zn/Cr ratio of about 0.68 are proved by EDAX

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Section: Resultsmentioning

confidence: 66%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%