Preparation of ZnFe2O4/SiO2 and CdFe2O4/SiO2 nanocomposites by sol-gel method.

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388980%3A_____%2F03%3A50033011" target="_blank" >RIV/61388980:_____/03:50033011 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216208:11310/03:5624

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Preparation of ZnFe2O4/SiO2 and CdFe2O4/SiO2 nanocomposites by sol-gel method.

Popis výsledku v původním jazyce

The purpose of this paper is to characterise the phase relations in the system ZnFe2O4/SiO2 and CdFe2O4/SiO2 by dependence on the thermal treatment. Both ferrites have the structure of normal spinels. The samples were prepared by the sol-gel method, heated at a temperature of 800-1100 degreesC and characterised by high-resolution transmission electron microscopy (HRTEM), X-ray diffraction, and Mossbauer spectroscopy. HRTEM revealed nanocrystals of the size of about 5-10 nm, depending on the heat treatment temperature. The spinel structure of ZnFe2O4 in the amorphous silica matrix proved to be very stable up to 1100 degreesC without decomposition to the zinc silicate and iron (111) oxide. On the other hand, CdFe2O4 already starts to decompose at 900 degreesC and complete decomposition to the alpha-Fe2O3 and cadmium silicate can be observed at 1100 degreesC. This decomposition is also accompanied with the recrystallisation of the silica matrix to quartz and cristobalite.

Název v anglickém jazyce

Preparation of ZnFe2O4/SiO2 and CdFe2O4/SiO2 nanocomposites by sol-gel method.

Popis výsledku anglicky

The purpose of this paper is to characterise the phase relations in the system ZnFe2O4/SiO2 and CdFe2O4/SiO2 by dependence on the thermal treatment. Both ferrites have the structure of normal spinels. The samples were prepared by the sol-gel method, heated at a temperature of 800-1100 degreesC and characterised by high-resolution transmission electron microscopy (HRTEM), X-ray diffraction, and Mossbauer spectroscopy. HRTEM revealed nanocrystals of the size of about 5-10 nm, depending on the heat treatment temperature. The spinel structure of ZnFe2O4 in the amorphous silica matrix proved to be very stable up to 1100 degreesC without decomposition to the zinc silicate and iron (111) oxide. On the other hand, CdFe2O4 already starts to decompose at 900 degreesC and complete decomposition to the alpha-Fe2O3 and cadmium silicate can be observed at 1100 degreesC. This decomposition is also accompanied with the recrystallisation of the silica matrix to quartz and cristobalite.

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

<a href="/cs/project/LN00A028" target="_blank" >LN00A028: Nové a perspektivní anorganické sloučeniny a materiály</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>Z - Vyzkumny zamer (s odkazem do CEZ)

Rok uplatnění

2003

Kód důvěrnosti údajů

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

Název periodika

Journal of Non-Crystalline Solids

ISSN

0022-3093

e-ISSN

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Svazek periodika

315

Číslo periodika v rámci svazku

1-2

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

7

Strana od-do

70-76

Kód UT WoS článku

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EID výsledku v databázi Scopus

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