Synthesis and Characterization of Some Alkaline-Earth-Oxide Nanoparticles

Title
Synthesis and Characterization of Some Alkaline-Earth-Oxide Nanoparticles
Authors
송종한임원철채근화원성옥씽 지텐드라
Keywords
Nanoparticles; Crystal structure; X-ray absorption spectroscopy
Issue Date
2018-04
Publisher
Journal of the Korean Physical Society
Citation
VOL 72, NO 8-899
Abstract
The present work reports the synthesis of MgO and CaO nanoparticles by using the sol-gel autocombustion method. The annealing of the precursor at 1200 degrees C was observed to lead the formation of MgO nanoparticles having average crystallite size of similar to 31 nm. Annealing the precursor at same temperature produced materials having a CaO phase with a minor impure phase of calcium carbonate (similar to 3%). The crystallite size corresponding to the CaO phase was 38 nm. A change of thermal history in the precursor was observed not to result in an improvement of the CaO phase. The change of thermal history in the precursor gave rise to mixed phases of CaCO3 and Ca(OH)(2) rather than the phase of CaO. Further, annealing at 1200 degrees C for 12 h resulted in the formation of the CaO phase along with almost 1 - 5% of calcium hydroxide as an impurity phase. X-ray absorption spectroscopic measurements carried out on these materials revealed that the local electronic/atomic structure of these oxides was not only affected by the impurity phases but also influenced by the carbaneous impurities attached to the crystallites.
URI
http://pubs.kist.re.kr/handle/201004/67944
ISSN
0374-4884
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KIST Publication > Article
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