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Statements

Subject Item
n2:RIV%2F61989592%3A15310%2F13%3A33144971%21RIV14-GA0-15310___
rdf:type
skos:Concept n15:Vysledek
rdfs:seeAlso
http://ammin.geoscienceworld.org/content/98/8-9/1550
dcterms:description
Manganese(II) monosulphide crystallizes into three different polymorphs (alpha-, beta-, and gamma-MnS). Out of these, alpha-MnS, also known as mineral alabandite, is considered the most stable and is widespread in terrestrial materials as well as in extraterrestrial objects such as meteorites. In this study, a low-temperature antiferromagnetic state of alpha-MnS was investigated using macroscopic magnetic measurements as induced and remanent field-cooled (FC) and zero-field-cooled (ZFC) magnetizations and magnetic hysteresis. Both natural alabandite and synthetic samples show: (1) Neel temperatures in a narrow temperature range around 153 K, and (2) a rapid increase of the magnetization around 40 K. An anomalous magnetic behavior taking place at about 40 K was previously ascribed to the magnetic transition from a high-temperature antiferromagnetic to a low-temperature ferromagnetic state documented for non-stoichiometric alpha-MnS slightly enriched in manganese. However, our detailed microscopic observations and, in particular, oxidation experiments indicate that the anomalous magnetic behavior around 40 K is caused by the presence of an oxide layer of ferrimagnetic hausmannite (Mn3O4) on the surface of alpha-MnS rather than being an intrinsic property of nearly stoichiometric alpha-MnS. Manganese(II) monosulphide crystallizes into three different polymorphs (alpha-, beta-, and gamma-MnS). Out of these, alpha-MnS, also known as mineral alabandite, is considered the most stable and is widespread in terrestrial materials as well as in extraterrestrial objects such as meteorites. In this study, a low-temperature antiferromagnetic state of alpha-MnS was investigated using macroscopic magnetic measurements as induced and remanent field-cooled (FC) and zero-field-cooled (ZFC) magnetizations and magnetic hysteresis. Both natural alabandite and synthetic samples show: (1) Neel temperatures in a narrow temperature range around 153 K, and (2) a rapid increase of the magnetization around 40 K. An anomalous magnetic behavior taking place at about 40 K was previously ascribed to the magnetic transition from a high-temperature antiferromagnetic to a low-temperature ferromagnetic state documented for non-stoichiometric alpha-MnS slightly enriched in manganese. However, our detailed microscopic observations and, in particular, oxidation experiments indicate that the anomalous magnetic behavior around 40 K is caused by the presence of an oxide layer of ferrimagnetic hausmannite (Mn3O4) on the surface of alpha-MnS rather than being an intrinsic property of nearly stoichiometric alpha-MnS.
dcterms:title
Low-temperature magnetism of alabandite: Crucial role of surface oxidation Low-temperature magnetism of alabandite: Crucial role of surface oxidation
skos:prefLabel
Low-temperature magnetism of alabandite: Crucial role of surface oxidation Low-temperature magnetism of alabandite: Crucial role of surface oxidation
skos:notation
RIV/61989592:15310/13:33144971!RIV14-GA0-15310___
n15:predkladatel
n16:orjk%3A15310
n3:aktivita
n17:S n17:P n17:I
n3:aktivity
I, P(ED2.1.00/03.0058), P(GAP108/11/1350), P(KJB300130903), S
n3:cisloPeriodika
8-9
n3:dodaniDat
n10:2014
n3:domaciTvurceVysledku
n8:1490397 n8:5207193 n8:2176645 n8:9251189 n8:7321023
n3:druhVysledku
n14:J
n3:duvernostUdaju
n13:S
n3:entitaPredkladatele
n9:predkladatel
n3:idSjednocenehoVysledku
85512
n3:idVysledku
RIV/61989592:15310/13:33144971
n3:jazykVysledku
n20:eng
n3:klicovaSlova
magnetism; Alabandite (MnS), hausmannite (Mn3O4), troilite (FeS)
n3:klicoveSlovo
n4:troilite%20%28FeS%29 n4:magnetism n4:Alabandite%20%28MnS%29 n4:hausmannite%20%28Mn3O4%29
n3:kodStatuVydavatele
US - Spojené státy americké
n3:kontrolniKodProRIV
[4DF1690968B6]
n3:nazevZdroje
American Mineralogist
n3:obor
n21:DB
n3:pocetDomacichTvurcuVysledku
5
n3:pocetTvurcuVysledku
10
n3:projekt
n7:GAP108%2F11%2F1350 n7:KJB300130903 n7:ED2.1.00%2F03.0058
n3:rokUplatneniVysledku
n10:2013
n3:svazekPeriodika
98
n3:tvurceVysledku
Filip, Jan Kohout, Tomáš Čuda, Jan Medřík, Ivo Santala, Eero Skala, Roman Zbořil, Radek Haloda, Jakub Tuček, Jiří Kosterov, Andrei
n3:wos
000323584000020
s:issn
0003-004X
s:numberOfPages
7
n6:doi
10.2138/am.2013.4348
n11:organizacniJednotka
15310