Thermal behaviour of pyrope at 1000 and 1100 degrees C: mechanism of Fe2+ oxidation and decomposition model

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15410%2F03%3A00001545" target="_blank" >RIV/61989592:15410/03:00001545 - isvavai.cz</a>

Alternative codes found

RIV/68145535:_____/03:15033061

Result on the web

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DOI - Digital Object Identifier

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Result language

angličtina

Original language name

Thermal behaviour of pyrope at 1000 and 1100 degrees C: mechanism of Fe2+ oxidation and decomposition model

Original language description

The mechanism of thermally induced oxidation of Fe2+ from natural pyrope has been studied at 1000 and 1100 degreesC using Fe-57 Mossbauer spectroscopy in conjunction with XRD, XRF, AFM, QELS, TG, DTA and electron microprobe analyses. At 1000 degreesC, the non-destructive oxidation of Fe2+ in air includes the partial stabilization of Fe3+ in the dodecahedral 24c position of the garnet structure and the simultaneous formation of hematite particles (15-20 nm). The incorporation of the magnesium ions to thehematite structure results in the suppression of the Morin transition temperature to below 20 K. The general garnet structure is preserved during the redox process at 1000 degreesC, in accordance with XRD and DTA data. At 1100 degreesC, however, oxidative conversion of pyrope to the mixed magnesium aluminium iron oxide, Fe-orthoenstatite and cristoballite was observed. During this destructive decomposition, Fe2+ is predominantly oxidized and incorporated into the spinel structure of Mg(

Czech name

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Czech description

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Type

J_x - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

CEP classification

BM - Solid-state physics and magnetism

OECD FORD branch

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Project

<a href="/en/project/GA202%2F00%2F0982" target="_blank" >GA202/00/0982: The study of the formation and transformations of the different iron(III)oxide forms during the thermal decom-position of iron salts</a><br>

Continuities

Z - Vyzkumny zamer (s odkazem do CEZ)

Publication year

2003

Confidentiality

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

Name of the periodical

PHYSICS AND CHEMISTRY OF MINERALS

ISSN

0342-1791

e-ISSN

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Volume of the periodical

30

Issue of the periodical within the volume

10

Country of publishing house

DE - GERMANY

Number of pages

8

Pages from-to

620-627

UT code for WoS article

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EID of the result in the Scopus database

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