About: Inversion twinning in troilite

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
Description	The crystal structure of troilite from chondrites Etter and Georgetown and a troilite analog synthesized by sulfurization of an iron wire was refined using single-crystal X-ray data. Troilite is known to be hexagonal, with space group P-62c, which is non-centrosymmetric, allowing two non-identical inversely related spatial arrangements of atoms within the unit cell. All three samples represent the so-called inversion twins. They contain both inversely related atomic orientations instead of a single atomic arrangement. The inversion twinning may have developed as a result of a phase transition from the ideal centrosymmetric NiAs-type structure to troilite-type structure during cooling. In addition, all samples were found to be cation-deficient. The departure from ideal stoichiometry-up to almost 3.5 rel% of metal atoms are missing-is also possibly related to atomic ordering when the crystals cooled. The crystal structure of troilite from chondrites Etter and Georgetown and a troilite analog synthesized by sulfurization of an iron wire was refined using single-crystal X-ray data. Troilite is known to be hexagonal, with space group P-62c, which is non-centrosymmetric, allowing two non-identical inversely related spatial arrangements of atoms within the unit cell. All three samples represent the so-called inversion twins. They contain both inversely related atomic orientations instead of a single atomic arrangement. The inversion twinning may have developed as a result of a phase transition from the ideal centrosymmetric NiAs-type structure to troilite-type structure during cooling. In addition, all samples were found to be cation-deficient. The departure from ideal stoichiometry-up to almost 3.5 rel% of metal atoms are missing-is also possibly related to atomic ordering when the crystals cooled. (en) Z monokrystalových rtg. difrakčních dat byly zpřesněny krystalové struktury troilitů z chondritů Etter a Georgetown a analogu troilitu syntetizovaného sulfurizací železného drátu. Všechny vzorky představují tzv. inverzní dvojčata. Dvojčatění vzniklo v důsledku fázového přechodu z ideální centrosymetrické struktury typu NiAs během chladnutí. Navíc všechny vzorky vykazují deficit kovových atomů až do 3.5 rel%. (cs)
Title	Inversion twinning in troilite Inversion twinning in troilite (en) Inverzní dvojčatění v troilitu (cs)
skos:prefLabel	Inversion twinning in troilite Inversion twinning in troilite (en) Inverzní dvojčatění v troilitu (cs)
skos:notation	RIV/67985831:_____/06:00051347!RIV07-GA0-67985831
http://linked.open.../vavai/riv/strany	917;921
http://linked.open...avai/riv/aktivita	P Z
http://linked.open...avai/riv/aktivity	P(GA203/99/M037), P(GA205/02/1101), P(GA205/05/0459), Z(AV0Z30130516)
http://linked.open...iv/cisloPeriodika	5-6
http://linked.open...vai/riv/dodaniDat	2007
http://linked.open...aciTvurceVysledku	Skála, Roman
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Geologický ústav AV ČR, v. v. i.
http://linked.open...dnocenehoVysledku	480324
http://linked.open...ai/riv/idVysledku	RIV/67985831:_____/06:00051347
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	troilite; absolute structure; crystallography; iron monosulfide; iron meteorites (en)
http://linked.open.../riv/klicoveSlovo	troilite absolute structure crystallography iron meteorites iron monosulfide
http://linked.open...odStatuVydavatele	US - Spojené státy americké
http://linked.open...ontrolniKodProRIV	[E89FD2AEA6C9]
http://linked.open...i/riv/nazevZdroje	American Mineralogist
http://linked.open...in/vavai/riv/obor	DB
http://linked.open...ichTvurcuVysledku	1 (xsd:int)
http://linked.open...cetTvurcuVysledku	3 (xsd:int)
http://linked.open...vavai/riv/projekt	Centre of molecular and crystal structures Crystal chemistry and phase relations of MeS phases (Me=Fe, Cr, Ti) - application to meteoritical troilites The system Os-Mo-S and its geological application
http://linked.open...UplatneniVysledku	2006
http://linked.open...v/svazekPeriodika	91
http://linked.open...iv/tvurceVysledku	Skála, Roman Drábek, M. Cisařová, I.
http://linked.open...n/vavai/riv/zamer	Zemský systém v průsečíku geologických procesů, vývoje života, klimatických a antropogenních vlivů
issn	0003-004X
number of pages	5 (xsd:int)

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