Simple and fast preparation of pure maghemite nanopowders through sol-gel self-combustion

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11310%2F11%3A10108461" target="_blank" >RIV/00216208:11310/11:10108461 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1007/s10971-011-2559-8" target="_blank" >http://dx.doi.org/10.1007/s10971-011-2559-8</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s10971-011-2559-8" target="_blank" >10.1007/s10971-011-2559-8</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Simple and fast preparation of pure maghemite nanopowders through sol-gel self-combustion

Popis výsledku v původním jazyce

Pure maghemite nanopowders made up of nanocrystals with average size of 19 nm was prepared by a simple sol-gel self combustion process. The gel pH and the primer temperature turned out the key parameters for the obtaining of the maghemite phase, that often is accompanied by the most thermodynamically stable hematite. Pure maghemite was achieved only with a gel pH value of 7 and with a primer temperature between 290 and 325 A degrees C. XRD and IR pointed out the formation of maghemite with tetragonal structure and HRTEM indicated the high degree of crystallinity of the powder. Mossbauer measurements allowed to confirm the presence of maghemite phase with Fe(octa):Fe(tetra) ratio of 1.62 which is very close to the theoretical value and the presence spincanting strongly dependent on applied magnetic field. This picture is confirmed by dc magnetic measurements.

Název v anglickém jazyce

Simple and fast preparation of pure maghemite nanopowders through sol-gel self-combustion

Popis výsledku anglicky

Pure maghemite nanopowders made up of nanocrystals with average size of 19 nm was prepared by a simple sol-gel self combustion process. The gel pH and the primer temperature turned out the key parameters for the obtaining of the maghemite phase, that often is accompanied by the most thermodynamically stable hematite. Pure maghemite was achieved only with a gel pH value of 7 and with a primer temperature between 290 and 325 A degrees C. XRD and IR pointed out the formation of maghemite with tetragonal structure and HRTEM indicated the high degree of crystallinity of the powder. Mossbauer measurements allowed to confirm the presence of maghemite phase with Fe(octa):Fe(tetra) ratio of 1.62 which is very close to the theoretical value and the presence spincanting strongly dependent on applied magnetic field. This picture is confirmed by dc magnetic measurements.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

CA - Anorganická chemie

OECD FORD obor

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Projekt

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Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2011

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Journal of Sol-Gel Science and Technology

ISSN

0928-0707

e-ISSN

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Svazek periodika

60

Číslo periodika v rámci svazku

3

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

9

Strana od-do

266-274

Kód UT WoS článku

000298012100008

EID výsledku v databázi Scopus

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