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Statements

Subject Item
n2:RIV%2F61989592%3A15310%2F12%3A33141000%21RIV13-MSM-15310___
rdf:type
skos:Concept n14:Vysledek
dcterms:description
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. 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.
dcterms:title
Iron redox reactions in the tourmaline structure: High-temperature treatment of Fe3+-rich schorl Iron redox reactions in the tourmaline structure: High-temperature treatment of Fe3+-rich schorl
skos:prefLabel
Iron redox reactions in the tourmaline structure: High-temperature treatment of Fe3+-rich schorl Iron redox reactions in the tourmaline structure: High-temperature treatment of Fe3+-rich schorl
skos:notation
RIV/61989592:15310/12:33141000!RIV13-MSM-15310___
n14:predkladatel
n20:orjk%3A15310
n4:aktivita
n18:Z n18:P
n4:aktivity
P(ED2.1.00/03.0058), P(GAP210/10/0743), Z(MSM6198959218)
n4:cisloPeriodika
JUN
n4:dodaniDat
n13:2013
n4:domaciTvurceVysledku
n9:5207193 n9:2176645 n9:7321023
n4:druhVysledku
n19:J
n4:duvernostUdaju
n17:S
n4:entitaPredkladatele
n15:predkladatel
n4:idSjednocenehoVysledku
143041
n4:idVysledku
RIV/61989592:15310/12:33141000
n4:jazykVysledku
n21:eng
n4:klicovaSlova
Fe; Mössbauer; chemistry; Mn-tourmaline; dravite series; site occupancies; chemical-composition; ferric-iron; heat-treatment; crystal-structure
n4:klicoveSlovo
n11:M%C3%B6ssbauer n11:chemistry n11:chemical-composition n11:dravite%20series n11:crystal-structure n11:site%20occupancies n11:heat-treatment n11:Mn-tourmaline n11:Fe n11:ferric-iron
n4:kodStatuVydavatele
GB - Spojené království Velké Británie a Severního Irska
n4:kontrolniKodProRIV
[A8C03B0FDFB8]
n4:nazevZdroje
Geochimica et Cosmochimica Acta
n4:obor
n5:DD
n4:pocetDomacichTvurcuVysledku
3
n4:pocetTvurcuVysledku
7
n4:projekt
n8:ED2.1.00%2F03.0058 n8:GAP210%2F10%2F0743
n4:rokUplatneniVysledku
n13:2012
n4:svazekPeriodika
86
n4:tvurceVysledku
Čuda, Jan Tuček, Jiří Novák, Milan Bosi, Ferdinando Wildner, Manfred Skogby, Henrik Filip, Jan
n4:wos
000303677400016
n4:zamer
n12:MSM6198959218
s:issn
0016-7037
s:numberOfPages
18
n10:doi
10.1016/j.gca.2012.02.031
n16:organizacniJednotka
15310