About: α-Fe2O3 versus β-Fe2O3: Controlling the Phase of the Transformation Product of ε-Fe2O3 in the Fe2O3/SiO2 System

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About: α-Fe2O3 versus β-Fe2O3: Controlling the Phase of the Transformation Product of ε-Fe2O3 in the Fe2O3/SiO2 System Goto Sponge NotDistinct Permalink

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
rdfs:seeAlso	http://pubs.acs.org/doi/abs/10.1021/cg4015114
Description	The influence of added sucrose on the phase composition of iron oxide nanoparticles was studied in the Fe2O3/SiO2 nanocomposites. The nanocomposites were prepared byimpregnation of mesoporous silica SBA-15 with iron nitrate containing various amounts of sucrose and their subsequent annealing at 1100 and 1200 oC. The phase composition of the iron oxide nanoparticles in the prepared nanocomposites was analyzed by X-ray diffraction and 57Fe Mössbauer spectroscopy on polycrystalline samples. Profile analysis of the X-ray diffraction maxima was used to determine the apparent crystallite size of the different polymorphs. The content of β-Fe2O3 in the samples increased with an increasing amount of sucrose, and no β-Fe2O3 was observed in the samples without sucrose. These samples contained only ε-Fe2O3 and hematite. The apparent crystallite size was found to be similar for both hematite and β-Fe2O3. Therefore, sucrose was identified as the primary variable, which directs the ε-Fe2O3 transformation to either hematite or β-Fe2O3. Our findings shift the way we understand the β-Fe2O3 formation from ε-Fe2O3 in the Fe2O3/SiO2 system from the size-directed to the starting materialdirected transformation. The influence of added sucrose on the phase composition of iron oxide nanoparticles was studied in the Fe2O3/SiO2 nanocomposites. The nanocomposites were prepared byimpregnation of mesoporous silica SBA-15 with iron nitrate containing various amounts of sucrose and their subsequent annealing at 1100 and 1200 oC. The phase composition of the iron oxide nanoparticles in the prepared nanocomposites was analyzed by X-ray diffraction and 57Fe Mössbauer spectroscopy on polycrystalline samples. Profile analysis of the X-ray diffraction maxima was used to determine the apparent crystallite size of the different polymorphs. The content of β-Fe2O3 in the samples increased with an increasing amount of sucrose, and no β-Fe2O3 was observed in the samples without sucrose. These samples contained only ε-Fe2O3 and hematite. The apparent crystallite size was found to be similar for both hematite and β-Fe2O3. Therefore, sucrose was identified as the primary variable, which directs the ε-Fe2O3 transformation to either hematite or β-Fe2O3. Our findings shift the way we understand the β-Fe2O3 formation from ε-Fe2O3 in the Fe2O3/SiO2 system from the size-directed to the starting materialdirected transformation. (en)
Title	α-Fe2O3 versus β-Fe2O3: Controlling the Phase of the Transformation Product of ε-Fe2O3 in the Fe2O3/SiO2 System α-Fe2O3 versus β-Fe2O3: Controlling the Phase of the Transformation Product of ε-Fe2O3 in the Fe2O3/SiO2 System (en)
skos:prefLabel	α-Fe2O3 versus β-Fe2O3: Controlling the Phase of the Transformation Product of ε-Fe2O3 in the Fe2O3/SiO2 System α-Fe2O3 versus β-Fe2O3: Controlling the Phase of the Transformation Product of ε-Fe2O3 in the Fe2O3/SiO2 System (en)
skos:notation	RIV/00216208:11320/14:10291740!RIV15-MSM-11320___
http://linked.open...avai/riv/aktivita	P S
http://linked.open...avai/riv/aktivity	P(GAP204/10/0035), S
http://linked.open...iv/cisloPeriodika	14
http://linked.open...vai/riv/dodaniDat	2015
http://linked.open...aciTvurceVysledku	Kmječ, Tomáš Kohout, Jaroslav
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	Univerzita Karlova v Praze / Matematicko-fyzikální fakulta
http://linked.open...dnocenehoVysledku	58042
http://linked.open...ai/riv/idVysledku	RIV/00216208:11320/14:10291740
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	Mössbauer spectroscopy; Fe2O3/SiO2; ε-Fe2O3; Controlling Phase Transformation; β-Fe2O3; α-Fe2O3 (en)
http://linked.open.../riv/klicoveSlovo	Mössbauer spectroscopy α-Fe2O3 β-Fe2O3 Controlling Phase Transformation Fe2O3/SiO2 ε-Fe2O3
http://linked.open...odStatuVydavatele	US - Spojené státy americké
http://linked.open...ontrolniKodProRIV	[3B36B0797989]
http://linked.open...i/riv/nazevZdroje	Crystal Growth and Design
http://linked.open...in/vavai/riv/obor	BM
http://linked.open...ichTvurcuVysledku	2 (xsd:int)
http://linked.open...cetTvurcuVysledku	4 (xsd:int)
http://linked.open...vavai/riv/projekt	Hyperfine Interactions in Nanosized and Low-Dimensional Iron Oxides
http://linked.open...UplatneniVysledku	2014
http://linked.open...v/svazekPeriodika	2014
http://linked.open...iv/tvurceVysledku	Bezdička, Petr Brázda, Petr Kmječ, Tomáš Kohout, Jaroslav
http://linked.open...ain/vavai/riv/wos	000332684400019
issn	1528-7483
number of pages	8 (xsd:int)
http://bibframe.org/vocab/doi	10.1021/cg4015114
http://localhost/t...ganizacniJednotka	11320

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