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  • Mössbauer spectroscopy and magnetic measurements were used for an analysis of nanocrystalline iron oxides (hematite α-Fe2O3, magnetite Fe3O4), Hägg carbide (Fe5C2), and α-Fe prepared by thermal treatment of synthetic ferrihydrite in various atmospheres. The transformation of ferrihydrite precursor was monitored by the measurements of temperature dependence of magnetic moment (thermomagnetic curves). Under optimized temperature and time, hematite nanoparticles were prepared by heating in vacuum. Application of hydrogen atmosphere yielded magnetite or α-Fe. Annealing in ethylene resulted in the formation of iron carbides.
  • Mössbauer spectroscopy and magnetic measurements were used for an analysis of nanocrystalline iron oxides (hematite α-Fe2O3, magnetite Fe3O4), Hägg carbide (Fe5C2), and α-Fe prepared by thermal treatment of synthetic ferrihydrite in various atmospheres. The transformation of ferrihydrite precursor was monitored by the measurements of temperature dependence of magnetic moment (thermomagnetic curves). Under optimized temperature and time, hematite nanoparticles were prepared by heating in vacuum. Application of hydrogen atmosphere yielded magnetite or α-Fe. Annealing in ethylene resulted in the formation of iron carbides. (en)
  • Mössbauerova spektroskopie a magnetometrie byly využity k analýze nanokrystalických oxidů železa (hematit -Fe2O3, magnetit Fe3O4), Häggova karbidu (Fe5C2) a -Fe, připravených tepelným zpracováním syntetického ferrihydritu v podmínkách různých atmosfér. Proces transformace ferrihydritu byl monitorován měřením teplotně závislého magnetického momentu (termomagnetické křivky). V optimalizovaných podmínkách (teplota, čas) byly připraveny nanočástice hematitu žíháním ve vakuu, nanočástice magnetitu a -Fe žíháním ve vodíku a nanočástice karbidu Fe5C2 žíháním v ethylenu. (cs)
Title
  • Mössbauer and Magnetic Studies of Nanocrystalline Iron, Iron Oxide and Iron Carbide Powders Prepared from Synthetic Ferrihydrite
  • Mössbauerova spektroskopie a magnetická charakterizace nanočástic železa, oxidů železa a karbidů železa připravených ze syntetického ferrihydritu (cs)
  • Mössbauer and Magnetic Studies of Nanocrystalline Iron, Iron Oxide and Iron Carbide Powders Prepared from Synthetic Ferrihydrite (en)
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  • Mössbauer and Magnetic Studies of Nanocrystalline Iron, Iron Oxide and Iron Carbide Powders Prepared from Synthetic Ferrihydrite
  • Mössbauerova spektroskopie a magnetická charakterizace nanočástic železa, oxidů železa a karbidů železa připravených ze syntetického ferrihydritu (cs)
  • Mössbauer and Magnetic Studies of Nanocrystalline Iron, Iron Oxide and Iron Carbide Powders Prepared from Synthetic Ferrihydrite (en)
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  • RIV/61989592:15310/08:00005400!RIV09-MSM-15310___
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  • P(1M0512), P(GA106/08/1440)
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  • 380662
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  • RIV/61989592:15310/08:00005400
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  • Ferrihydrite; nanocrystalline materials; iron oxide; iron carbide; Mössbauer spectroscopy (en)
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  • US - Spojené státy americké
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  • 1070
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  • Filip, Jan
  • Schneeweiss, Oldřich
  • Zbořil, Radek
  • Mašláň, Miroslav
  • Grygar, T.
  • David, B.
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  • 0094-243X
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  • 15310
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