Thermal behavior of almandine at temperatures up to 1,200A degrees C in hydrogen

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15310%2F12%3A33138930" target="_blank" >RIV/61989592:15310/12:33138930 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1007/s00269-012-0488-x" target="_blank" >http://dx.doi.org/10.1007/s00269-012-0488-x</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s00269-012-0488-x" target="_blank" >10.1007/s00269-012-0488-x</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Thermal behavior of almandine at temperatures up to 1,200A degrees C in hydrogen

Popis výsledku v původním jazyce

The thermally induced reductive decomposition of a natural near end-member almandine [VIII(Fe2.85Mg0.11Ca0.05Mn0.02)VI(Al1.99)IV(Si2.99)O12] and possible hydrogen diffusion into its structure have been carried out at temperatures up to 1,200°C, monitoredby simultaneous thermogravimetric analysis and differential scanning calorimetry (DSC), infrared and 57Fe Mössbauer spectroscopy and X-ray powder diffraction. Below 1,000°C, evidence for hydrogen diffusion into almandine structure was not observed. At temperatures above 1,000°C, reductive decomposition sets in, as displayed by a sharp endothermic peak at 1,055°C on the DSC curve accompanied by a total mass loss of 3.51%. We observe the following decomposition mechanism: almandine + hydrogen ? alfa-Fe +cristobalite + hercynite + water. At higher temperatures, fayalite and sekaninaite are formed by consecutive reaction of alfa-Fe with cristobalite and water, and cristobalite with hercynite, respectively. The metallic alfa-Fe phase forms

Název v anglickém jazyce

Thermal behavior of almandine at temperatures up to 1,200A degrees C in hydrogen

Popis výsledku anglicky

The thermally induced reductive decomposition of a natural near end-member almandine [VIII(Fe2.85Mg0.11Ca0.05Mn0.02)VI(Al1.99)IV(Si2.99)O12] and possible hydrogen diffusion into its structure have been carried out at temperatures up to 1,200°C, monitoredby simultaneous thermogravimetric analysis and differential scanning calorimetry (DSC), infrared and 57Fe Mössbauer spectroscopy and X-ray powder diffraction. Below 1,000°C, evidence for hydrogen diffusion into almandine structure was not observed. At temperatures above 1,000°C, reductive decomposition sets in, as displayed by a sharp endothermic peak at 1,055°C on the DSC curve accompanied by a total mass loss of 3.51%. We observe the following decomposition mechanism: almandine + hydrogen ? alfa-Fe +cristobalite + hercynite + water. At higher temperatures, fayalite and sekaninaite are formed by consecutive reaction of alfa-Fe with cristobalite and water, and cristobalite with hercynite, respectively. The metallic alfa-Fe phase forms

Druh

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

CEP obor

DB - Geologie a mineralogie

OECD FORD obor

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Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

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

Rok uplatnění

2012

Kód důvěrnosti údajů

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

Název periodika

PHYSICS AND CHEMISTRY OF MINERALS

ISSN

0342-1791

e-ISSN

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Svazek periodika

39

Číslo periodika v rámci svazku

4

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

8

Strana od-do

311-318

Kód UT WoS článku

000302248500005

EID výsledku v databázi Scopus

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