gamma-Fe2O3 Nanopowders Synthesized in Microwave Plasma and Extraordinarily Strong Temperature Influence on Their Mossbauer Spectra
Identifikátory výsledku
Kód výsledku v 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>
Nalezeny alternativní kódy
RIV/68378271:_____/12:00392673 RIV/68081723:_____/12:00392673
Výsledek na webu
<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>
Alternativní jazyky
Jazyk výsledku
angličtina
Název v původním jazyce
gamma-Fe2O3 Nanopowders Synthesized in Microwave Plasma and Extraordinarily Strong Temperature Influence on Their Mossbauer Spectra
Popis výsledku v původním jazyce
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.
Název v anglickém jazyce
gamma-Fe2O3 Nanopowders Synthesized in Microwave Plasma and Extraordinarily Strong Temperature Influence on Their Mossbauer Spectra
Popis výsledku anglicky
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.
Klasifikace
Druh
J<sub>x</sub> - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)
CEP obor
BL - Fyzika plasmatu a výboje v plynech
OECD FORD obor
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Návaznosti výsledku
Projekt
Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.
Návaznosti
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Ostatní
Rok uplatnění
2012
Kód důvěrnosti údajů
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Údaje specifické pro druh výsledku
Název periodika
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
ISSN
1533-4880
e-ISSN
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Svazek periodika
12
Číslo periodika v rámci svazku
12
Stát vydavatele periodika
US - Spojené státy americké
Počet stran výsledku
9
Strana od-do
9277-9285
Kód UT WoS článku
000315172400062
EID výsledku v databázi Scopus
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