Iron redox reactions in the tourmaline structure: High-temperature treatment of Fe3+-rich schorl

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15310%2F12%3A33141000" target="_blank" >RIV/61989592:15310/12:33141000 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216224:14310/12:00058621

Výsledek na webu

<a href="http://dx.doi.org/10.1016/j.gca.2012.02.031" target="_blank" >http://dx.doi.org/10.1016/j.gca.2012.02.031</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.gca.2012.02.031" target="_blank" >10.1016/j.gca.2012.02.031</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Iron redox reactions in the tourmaline structure: High-temperature treatment of Fe3+-rich schorl

Popis výsledku v původním jazyce

We present a detailed study of thermally-driven oxidation and reduction of Fe in the structure of schorl (as the most widespread tourmaline), Fe2+-bearing olenite and fluor-schorl. The principal Fe3+-rich tourmaline investigated in this study is a natural schorl sample from a unique occurrence in peralkaline rocks near Cancrinite Hill, east of Bancroft, southern Ontario. Tourmaline samples were thermally-treated in air and hydrogen at temperatures of 700, 800 and 900 °C to oxidize or reduce the structural Fe. High-temperature changes were continuously monitored using 57Fe Mössbauer and infrared spectroscopy. Proportions of Fe2+ and Fe3+ vary as a function of the heat treatment. An increase in Fe3+ up to 100% after heating in air at 700 °C was observed,whereas only small changes in the Fe3+/Fetot ratio after heating under hydrogen at 700 °C was revealed. Partial deprotonation/protonation represents charge compensation for the oxidation/reduction of Fe at the Y and Z sites.

Název v anglickém jazyce

Iron redox reactions in the tourmaline structure: High-temperature treatment of Fe3+-rich schorl

Popis výsledku anglicky

We present a detailed study of thermally-driven oxidation and reduction of Fe in the structure of schorl (as the most widespread tourmaline), Fe2+-bearing olenite and fluor-schorl. The principal Fe3+-rich tourmaline investigated in this study is a natural schorl sample from a unique occurrence in peralkaline rocks near Cancrinite Hill, east of Bancroft, southern Ontario. Tourmaline samples were thermally-treated in air and hydrogen at temperatures of 700, 800 and 900 °C to oxidize or reduce the structural Fe. High-temperature changes were continuously monitored using 57Fe Mössbauer and infrared spectroscopy. Proportions of Fe2+ and Fe3+ vary as a function of the heat treatment. An increase in Fe3+ up to 100% after heating in air at 700 °C was observed,whereas only small changes in the Fe3+/Fetot ratio after heating under hydrogen at 700 °C was revealed. Partial deprotonation/protonation represents charge compensation for the oxidation/reduction of Fe at the Y and Z sites.

Druh

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

CEP obor

DD - Geochemie

OECD FORD obor

—

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

Geochimica et Cosmochimica Acta

ISSN

0016-7037

e-ISSN

—

Svazek periodika

86

Číslo periodika v rámci svazku

JUN

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

18

Strana od-do

239-256

Kód UT WoS článku

000303677400016

EID výsledku v databázi Scopus

—