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@article{1092212,
author = {Filip, Jan and Bosi, Ferdinando and Novák, Milan and Skogby, Henrik and Tuček, Jiří and Čuda, Jan and Wildner, Manfred},
article_number = {JUN},
doi = {http://dx.doi.org/10.1016/j.gca.2012.02.031},
keywords = {crystal-structure; heat-treatment; ferric-iron; chemical-composition; site occupancies; dravite series; Mn-tourmaline; chemistry; Mössbauer; Fe},
language = {eng},
issn = {0016-7037},
journal = {Geochimica et Cosmochimica Acta},
title = {Iron redox reactions in the tourmaline structure: High-temperature treatment of Fe3+-rich schorl},
volume = {86},
year = {2012}
}
TY - JOUR
ID - 1092212
AU - Filip, Jan - Bosi, Ferdinando - Novák, Milan - Skogby, Henrik - Tuček, Jiří - Čuda, Jan - Wildner, Manfred
PY - 2012
TI - Iron redox reactions in the tourmaline structure: High-temperature treatment of Fe3+-rich schorl
JF - Geochimica et Cosmochimica Acta
VL - 86
IS - JUN
SP - 239-256
EP - 239-256
SN - 00167037
KW - crystal-structure
KW - heat-treatment
KW - ferric-iron
KW - chemical-composition
KW - site occupancies
KW - dravite series
KW - Mn-tourmaline
KW - chemistry
KW - Mössbauer
KW - Fe
N2 - 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.
ER -
FILIP, Jan, Ferdinando BOSI, Milan NOVÁK, Henrik SKOGBY, Jiří TUČEK, Jan ČUDA a Manfred WILDNER. Iron redox reactions in the tourmaline structure: High-temperature treatment of Fe3+-rich schorl. \textit{Geochimica et Cosmochimica Acta}. roč.~86, JUN, s.~239-256. ISSN~0016-7037. doi:10.1016/j.gca.2012.02.031. 2012.
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