gamma-Fe2O3 Nanopowders Synthesized in Microwave Plasma and Extraordinarily Strong Temperature Influence on Their Mossbauer Spectra

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F12%3A00058632" target="_blank" >RIV/00216224:14310/12:00058632 - isvavai.cz</a>
Alternative codes found
RIV/68378271:_____/12:00392673 RIV/68081723:_____/12:00392673
Result on the web
<a href="http://dx.doi.org/10.1166/jnn.2012.6767" target="_blank" >http://dx.doi.org/10.1166/jnn.2012.6767</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1166/jnn.2012.6767" target="_blank" >10.1166/jnn.2012.6767</a>

Result language
angličtina
Original language name
gamma-Fe2O3 Nanopowders Synthesized in Microwave Plasma and Extraordinarily Strong Temperature Influence on Their Mossbauer Spectra
Original language description
The article reports on two nanopowders synthesized in microwave plasma: the first sample was synthesized in a torch discharge at 1 bar and the second sample was synthesized in low-pressure plasma at 40 mbar. Morphology, composition and properties of thepowders were studied by TEM, XRD, Raman and Mossbauer spectroscopies, and magnetic measurements. In the XRD patterns of the samples only gamma-Fe2O3 was identified (mean crystallite size d(XRD) was 24 nm for the first sample and 13 nm for the second sample). Based on the Mossbauer spectra measured at 5 K, the presence of other iron oxide phases was excluded in both samples. Unusually strong temperature dependence of the Lamb-Mossbauer factor was observed: I-SA(5 K)//(SA)(293 K) = 6 in the case of the first sample and I-SA(5 K)//(SA)(293 K) = 22 for the second sample (I-SA denotes integral spectrum area). This effect is explained as the consequence of the reduced agglomeration of electrically charged nanoparticles in the plasma, i.e.
Czech name
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Czech description
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Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
BL - Plasma physics and discharge through gases
OECD FORD branch
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Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2012
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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