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siegen_opus_105.xml
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siegen_opus_105.xml
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<mets:mets xmlns:mets="http://www.loc.gov/METS/" xmlns:mods="http://www.loc.gov/mods/v3"
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<titleInfo lang="eng">
<title>Preparation, structure and properties of new ternary chalcogenides and germanides of the metals from the first transition series, Cr, Mn, Fe and Ni</title>
</titleInfo>
<name type="personal">
<displayForm>Aleksandrov, Krasimir</displayForm>
<namePart type="family">Aleksandrov</namePart>
<namePart type="given">Krasimir</namePart>
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</role>
</name>
<typeOfResource>text</typeOfResource>
<genre authority="dini">doctoralThesis</genre>
<originInfo>
<dateIssued encoding="w3cdtf" keyDate="yes">2005</dateIssued>
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<language>
<languageTerm type="code" authority="iso639-2b">eng</languageTerm>
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<abstract type="content" lang="eng">This thesis deals with the synthesis, structure determination and investigation of the properties of Cr 2 Ge 2 Se 6 , Mn 2 GeSe 4 , Fe 3 GeTe 2 and Ni 3 GeTe 2 . Mn 2 GeSe 4 crystallizes in the orthorhombic space group Pnma (a=1335,0(3) pm, b = 776,5(2) pm, c = 630,7(1) pm) is one of the rare ternary transition metal selenides representatives of the olivine ((Fe, Mg) 2 SiO 4 ) structure - type. Fe 3 GeTe 2 and Ni 3 GeTe 2 are the first ternary members of the filled NiAs - structures. Both crystallize in the hexagonal group P6 3 /mmc (a = b = 399,1(1) pm, c=1633,6(3) pm for Fe 3 GeTe 2 and a = b = 319,1(1) pm, c=1602,2(3) pm for Ni 3 GeTe 2 , respectively). Their structures are characterized by alternating layer packages, each one built of five layers. Cr 2 Ge 2 Se 6 is a new compound belonging to the the M 2 X 2 Y 6 (M = transition metal, X = Si, Ge, Y = chalcogen) structure family. X - ray powder diffraction investigations find a hexagonal symmetry. The lattice constants are a = b = 629,3(3) pm, c = 1942,1(6) pm, γ = 120°. Magnetic properties studies show antiferromagnetic interactions in Mn 2 GeSe 4 and ferromagnetic spin ordering in Fe 3 GeTe 2 . Ni 3 GeTe 2 exhibits weak paramagnetism.</abstract>
<abstract type="content" lang="ger">Die vorliegende Arbeit befasst sich mit dem Synthese, der Strukturchemie und der Eigenschaften von Cr 2 Ge 2 Se 6 , Mn 2 GeSe 4 , Fe 3 GeTe 2 and Ni 3 GeTe 2 . Mn 2 GeSe 4 ist eines der selten ternären Übergangsmetallselenide aus der Olivin Struktur Typ, kristallisiert in der orthorhombische Raumgruppe Pnma (a=1335,0(3) pm, b = 776,5(2) pm, c = 630,7(1) pm). Fe 3 GeTe 2 and Ni 3 GeTe 2 sind die erste ternäre Verbindungen von ausgefüllte NiAs - Strukturen. Beide kristallisieren in der hexagonale Raumgruppe P6 3 /mmc (a = b = 399,1(1) pm, c=1633,6(3) pm für Fe 3 GeTe 2 und a = b = 319,1(1) pm, c=1602,2(3) pm für Ni 3 GeTe 2 ). Die Struktur belegte aus Schichtpaketen. Jeder Schichtpaket ist von fünf Schichten ausgebaut. Cr 2 Ge 2 Se 6 ist eine neue Verbindung der M 2 X 2 Y 6 Strukturtyp (M = Übergangsmetall, X = Si, Ge, Y = Chalcogen). Nach Rontgenpulverdaten kristallisiert hexagonal mit den Gitterkonstanten a = b = 629,3(3) pm, c = 1942,1(6) pm, γ = 120°. Die Untersuchung an magnetische Eigenschaften obengenante Verbindungen weisen antiferromagnetische Wechselwirkung bei Mn 2 GeSe 4 und ferromagnetiche Spin-Orientierung in Fe 3 GeTe 2 . Bei Ni 3 GeTe 2 ist schwaches Paramagnetismus zu beobachten.</abstract>
<subject>
<topic>Chalkogenide</topic>
<topic>Germanide</topic>
<topic>Kristallstruktur</topic>
</subject>
<classification authority="ioo" displayLabel="Fachbereich 8, Chemie - Biologie"></classification>
<identifier type="urn">urn:nbn:de:hbz:467-1058</identifier>
<identifier type="sys">HT014432558</identifier>
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<recordIdentifier>siegen_opus_105</recordIdentifier>
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<vl:doctype>oaDoctoralThesis</vl:doctype>
<vl:defenseDate>2005-06-29</vl:defenseDate>
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