About: gamma-Fe2O3 nanopowders synthesized in microwave plasma and extraordinarily strong temperature influence on their Mössbauer spectra

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About: gamma-Fe2O3 nanopowders synthesized in microwave plasma and extraordinarily strong temperature influence on their Mössbauer spectra Goto Sponge NotDistinct Permalink

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
Description	Two nanopowders synth. in microwave plasma:the first one in a torch discharge at 1 bar,the second one in low-pressure plasma at 40 mbar. Morphology, composition and properties studied by TEM, XRD, Raman and Mössbauer spectra, magnetic meas.. By XRD only gamma- Fe2O3 identified (mean crystallite size dXRD 24 nm for the first and 13 nm for the second one). From the Mössbauer spectra meas.at 5 K, no other iron oxide phases found in both samples. Unusually strong temp. dependence of the Lamb-Mössbauer factor observed: ISA(5 K)/ISA(293 K)=6 in the case of the first sample and ISA(5 K)/ISA(293 K)=22 for the second sample (ISA denotes integral spectrum area),which explained as the consequence of the reduced clump of electrically charged nanoparticles in the plasma, i.e., particles can either move at 293 K (when they are free) or tilt (if they are a chain part). No superparamagnetic phase at 293 K by Mössbauer spectra of both samples. Two nanopowders synth. in microwave plasma:the first one in a torch discharge at 1 bar,the second one in low-pressure plasma at 40 mbar. Morphology, composition and properties studied by TEM, XRD, Raman and Mössbauer spectra, magnetic meas.. By XRD only gamma- Fe2O3 identified (mean crystallite size dXRD 24 nm for the first and 13 nm for the second one). From the Mössbauer spectra meas.at 5 K, no other iron oxide phases found in both samples. Unusually strong temp. dependence of the Lamb-Mössbauer factor observed: ISA(5 K)/ISA(293 K)=6 in the case of the first sample and ISA(5 K)/ISA(293 K)=22 for the second sample (ISA denotes integral spectrum area),which explained as the consequence of the reduced clump of electrically charged nanoparticles in the plasma, i.e., particles can either move at 293 K (when they are free) or tilt (if they are a chain part). No superparamagnetic phase at 293 K by Mössbauer spectra of both samples. (en)
Title	gamma-Fe2O3 nanopowders synthesized in microwave plasma and extraordinarily strong temperature influence on their Mössbauer spectra gamma-Fe2O3 nanopowders synthesized in microwave plasma and extraordinarily strong temperature influence on their Mössbauer spectra (en)
skos:prefLabel	gamma-Fe2O3 nanopowders synthesized in microwave plasma and extraordinarily strong temperature influence on their Mössbauer spectra gamma-Fe2O3 nanopowders synthesized in microwave plasma and extraordinarily strong temperature influence on their Mössbauer spectra (en)
skos:notation	RIV/68378271:_____/12:00392673!RIV14-AV0-68378271
http://linked.open...avai/predkladatel	Fyzikální ústav AV ČR, v.v.i.
http://linked.open...avai/riv/aktivita	I P
http://linked.open...avai/riv/aktivity	I, P(GA202/08/0178), P(GD104/09/H080)
http://linked.open...iv/cisloPeriodika	12
http://linked.open...vai/riv/dodaniDat	2014
http://linked.open...aciTvurceVysledku	Šantavá, Eva
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Fyzikální ústav AV ČR, v. v. i.
http://linked.open...dnocenehoVysledku	137705
http://linked.open...ai/riv/idVysledku	RIV/68378271:_____/12:00392673
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	gamma-Fe2O3; nanoparticles; Mössbauer and Raman spectra; XRD; TEM; magnetic meas (en)
http://linked.open.../riv/klicoveSlovo	TEM XRD nanoparticles Mössbauer and Raman spectra gamma-Fe2O3 magnetic meas
http://linked.open...odStatuVydavatele	US - Spojené státy americké
http://linked.open...ontrolniKodProRIV	[C88C8E25F06F]
http://linked.open...i/riv/nazevZdroje	Journal of Nanoscience and Nanotechnology
http://linked.open...in/vavai/riv/obor	BM
http://linked.open...ichTvurcuVysledku	1 (xsd:int)
http://linked.open...cetTvurcuVysledku	6 (xsd:int)
http://linked.open...vavai/riv/projekt	Synthesis of Fe-based magnetic nanoparticles in low-temperature microwave plasma Plasmachemical processes and their technological applications
http://linked.open...UplatneniVysledku	2012
http://linked.open...v/svazekPeriodika	12
http://linked.open...iv/tvurceVysledku	David, Bohumil Schneeweiss, Oldřich Šantavá, Eva Jašek, O. Kudrle, V. Pizúrová, Naděžda
http://linked.open...ain/vavai/riv/wos	000315172400062
issn	1533-4880
number of pages	9 (xsd:int)
http://bibframe.org/vocab/doi	10.1166/jnn.2012.6767

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