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Titel
Pd6CuB3 - a new structure type of borides. Th7Fe3-type derivative structures in Pd(Pt)-Cu-B systems
VerfasserSalamakha, Leonid ; Sologub, Oksana ; Stöger, Berthold ; Rogl, Peter In der Gemeinsamen Normdatei der DNB nachschlagen ; Waas, Monika ; Michor, Herwig In der Gemeinsamen Normdatei der DNB nachschlagen ; Bauer, Ernst In der Gemeinsamen Normdatei der DNB nachschlagen
Erschienen in
Chemistry - A European Journal, 2017, Jg. 23, S. 4810-4817
ErschienenWiley, 2017
Ausgabe
Submitted version
SpracheEnglisch
DokumenttypAufsatz in einer Zeitschrift
Projekt-/ReportnummerAustrian Science Fund (FWF): V279-N19
ISSN1521-3765
URNurn:nbn:at:at-ubtuw:3-3293 Persistent Identifier (URN)
DOI10.1002/chem.201602767 
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Pd6CuB3 - a new structure type of borides. Th7Fe3-type derivative structures in Pd(Pt)-Cu-B systems [1.72 mb]
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Zusammenfassung (Englisch)

A missing member of the series of Th7Fe3-type derivative structures, h-(Pd0.864Cu0.136)7B3 (unique structure type Pd6CuB3, space group P63cm, a=12.9426(9) Å, c=4.8697(4) Å) was obtained from as cast alloys and alloys annealed at 600 C - 650 C. Further substitution of Cu by Pd led to formation of a Mn7C3-type structure, o-(Pd0.93Cu0.07)7B3 (space group Pnma, a=4.8971(2) Å, b=7.5353(3) Å, c=12.9743(6) Å). Isotypic h-(Pt0.70Cu0.30)7B3 was observed in the Pt-Cu-B system as a low temperature phase (T600 C), whereas the B-filled Th7Fe3-type (HT h-(Pt0.717Cu0.283)7B3+x, space group P63mc, a=7.4424(12) Å, c=4.8549(8) Å) proved to be stable at high temperature. The three structures are built of columns of face connected metal octahedra and columns of metal tetrahedra alternatingly fused by common faces and vertices. Boron atoms are found in trigonal prisms formed by metal atoms; additionally octahedral boron coordination was encountered in HT h-(Pt0.717Cu0.283)7B3+x. A superconductivity was discovered for Pt4.9Cu2.1B3 (Pd6CuB3-type) and Pt5.04Cu1.96B3.3 (B-filled Th7Fe3-type) below 0.67 and 0.66 K, respectively. Despite the close value of the transition temperature the values of the upper critical field at 0 K differ as 0.37 T and 0.27 T for the two compounds.

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