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| 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 by impregnation of mesoporous silica SBA-15 with iron nitrate containing various amounts of sucrose and their subsequent annealing at 1100 and 1200 degrees C. The phase composition of the iron oxide nanoparticles in the prepared nanocomposites was analyzed by X-ray diffraction and Fe-57 Mossbauer 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 beta-Fe2O3 in the samples increased with an increasing amount of sucrose, and no beta-Fe2O3 was observed in the samples without sucrose. These samples contained only epsilon-Fe2O3 and hematite. The apparent crystallite size was found to be similar for both hematite and beta-Fe2O3. Therefore, sucrose was identified as the primary variable, which directs the epsilon-Fe2O3 transformation to either hematite or beta-Fe2O3. Our findings shift the way we understand the beta-Fe2O3 formation from epsilon-Fe2O3 in the Fe2O3/SiO2 system from the size-directed to the starting material-directed 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 by impregnation of mesoporous silica SBA-15 with iron nitrate containing various amounts of sucrose and their subsequent annealing at 1100 and 1200 degrees C. The phase composition of the iron oxide nanoparticles in the prepared nanocomposites was analyzed by X-ray diffraction and Fe-57 Mossbauer 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 beta-Fe2O3 in the samples increased with an increasing amount of sucrose, and no beta-Fe2O3 was observed in the samples without sucrose. These samples contained only epsilon-Fe2O3 and hematite. The apparent crystallite size was found to be similar for both hematite and beta-Fe2O3. Therefore, sucrose was identified as the primary variable, which directs the epsilon-Fe2O3 transformation to either hematite or beta-Fe2O3. Our findings shift the way we understand the beta-Fe2O3 formation from epsilon-Fe2O3 in the Fe2O3/SiO2 system from the size-directed to the starting material-directed transformation. (en)
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| Title
| - alpha-Fe2O3 versus beta-Fe2O3: Controlling the Phase of the Transformation Product of epsilon-Fe2O3 in the Fe2O3/SiO2 System
- alpha-Fe2O3 versus beta-Fe2O3: Controlling the Phase of the Transformation Product of epsilon-Fe2O3 in the Fe2O3/SiO2 System (en)
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| skos:prefLabel
| - alpha-Fe2O3 versus beta-Fe2O3: Controlling the Phase of the Transformation Product of epsilon-Fe2O3 in the Fe2O3/SiO2 System
- alpha-Fe2O3 versus beta-Fe2O3: Controlling the Phase of the Transformation Product of epsilon-Fe2O3 in the Fe2O3/SiO2 System (en)
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| skos:notation
| - RIV/61388980:_____/14:00429195!RIV15-GA0-61388980
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| http://linked.open...avai/riv/aktivita
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| http://linked.open...avai/riv/aktivity
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| http://linked.open...iv/cisloPeriodika
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| http://linked.open...vai/riv/dodaniDat
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| http://linked.open...aciTvurceVysledku
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| http://linked.open.../riv/druhVysledku
| |
| http://linked.open...iv/duvernostUdaju
| |
| http://linked.open...titaPredkladatele
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| http://linked.open...dnocenehoVysledku
| |
| http://linked.open...ai/riv/idVysledku
| - RIV/61388980:_____/14:00429195
|
| http://linked.open...riv/jazykVysledku
| |
| http://linked.open.../riv/klicovaSlova
| - CHEMICAL-VAPOR-DEPOSITION; OXIDE THIN-FILMS; X-RAY; GAMMA-FE2O3 NANOPARTICLES; THERMAL-DECOMPOSITION (en)
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| http://linked.open.../riv/klicoveSlovo
| |
| http://linked.open...odStatuVydavatele
| - US - Spojené státy americké
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| http://linked.open...ontrolniKodProRIV
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| http://linked.open...i/riv/nazevZdroje
| |
| http://linked.open...in/vavai/riv/obor
| |
| http://linked.open...ichTvurcuVysledku
| |
| http://linked.open...cetTvurcuVysledku
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| http://linked.open...vavai/riv/projekt
| |
| http://linked.open...UplatneniVysledku
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| http://linked.open...v/svazekPeriodika
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| http://linked.open...iv/tvurceVysledku
| - Bezdička, Petr
- Brázda, Petr
- Kohout, J.
- Kmjec, T.
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| http://linked.open...ain/vavai/riv/wos
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| issn
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| number of pages
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| http://bibframe.org/vocab/doi
| |
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