Citation link:
https://nbn-resolving.org/urn:nbn:de:hbz:467-1058
DC Field | Value | Language |
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dc.contributor.author | Aleksandrov, Krasimir | - |
dc.date.accessioned | 2019-09-02T09:54:23Z | - |
dc.date.available | 2006-10-10T12:12:12Z | - |
dc.date.available | 2019-09-02T09:54:23Z | - |
dc.date.issued | 2005 | - |
dc.description.abstract | 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. | en |
dc.description.abstract | 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. | de |
dc.identifier.uri | https://dspace.ub.uni-siegen.de/handle/ubsi/105 | - |
dc.identifier.urn | urn:nbn:de:hbz:467-1058 | - |
dc.language.iso | en | en |
dc.rights.uri | https://dspace.ub.uni-siegen.de/static/license.txt | de |
dc.subject.ddc | 540 Chemie | de |
dc.subject.other | Chalkogenide | de |
dc.subject.other | Germanide | de |
dc.subject.other | Kristallstruktur | de |
dc.title | Preparation, structure and properties of new ternary chalcogenides and germanides of the metals from the first transition series, Cr, Mn, Fe and Ni | en |
dc.type | Doctoral Thesis | de |
item.fulltext | With Fulltext | - |
ubsi.date.accepted | 2005-06-29 | - |
ubsi.publication.affiliation | Fachbereich 8, Chemie - Biologie | de |
ubsi.subject.ghbs | UOD | - |
ubsi.type.version | publishedVersion | de |
Appears in Collections: | Hochschulschriften |
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