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

J 2012

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

FILIP, Jan; Ferdinando BOSI; Milan NOVÁK; Henrik SKOGBY; Jiří TUČEK et. al.

Basic information

Original name

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

Authors

FILIP, Jan (203 Czech Republic, guarantor); Ferdinando BOSI (380 Italy); Milan NOVÁK (203 Czech Republic, belonging to the institution); Henrik SKOGBY (752 Sweden); Jiří TUČEK (203 Czech Republic); Jan ČUDA (203 Czech Republic) and Manfred WILDNER (40 Austria)

Edition

Geochimica et Cosmochimica Acta, 2012, 0016-7037

Other information

Language

English

Type of outcome

Article in a journal

Field of Study

Geochemistry

Country of publisher

United Kingdom of Great Britain and Northern Ireland

Confidentiality degree

is not subject to a state or trade secret

Impact factor

Impact factor: 3.884

RIV identification code

RIV/00216224:14310/12:00058621

Organization unit

Faculty of Science

DOI

http://dx.doi.org/10.1016/j.gca.2012.02.031

UT WoS

000303677400016

Keywords in English

crystal-structure; heat-treatment; ferric-iron; chemical-composition; site occupancies; dravite series; Mn-tourmaline; chemistry; Mössbauer; Fe

Abstract

In the original language

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.

Links

GAP210/10/0743, research and development project

Name: Chemické složení a stupeň strukturního uspořádání přírodních turmalínů - geochemické versus strukturní faktory

Investor: Czech Science Foundation, Chemical composition and structural order of natural tourmalines - geochemical versus crystal-structural constraints

Cite

FILIP, Jan; Ferdinando BOSI; Milan NOVÁK; Henrik SKOGBY; Jiří TUČEK; Jan ČUDA and Manfred WILDNER. Iron redox reactions in the tourmaline structure: High-temperature treatment of Fe3+-rich schorl. Geochimica et Cosmochimica Acta. 2012, vol. 86, JUN, p. 239-256. ISSN 0016-7037. Available from: https://dx.doi.org/10.1016/j.gca.2012.02.031.

@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 and Manfred WILDNER. Iron redox reactions in the tourmaline structure: High-temperature treatment of Fe3+-rich schorl. \textit{Geochimica et Cosmochimica Acta}. 2012, vol.~86, JUN, p.~239-256. ISSN~0016-7037. Available from: https://dx.doi.org/10.1016/j.gca.2012.02.031.

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