ZIB

Hits per page

hits 1 - 3 | 3 hits

Sorting

Electronic Resource

The metal-non-metal transition in the mixed valency solid solution Cr"1"-"xW"1"+"xO"4

Doumerc, J.P. ; Yangshu, W. ; Dordor, P. ; [et al.]

Amsterdam : Elsevier

Journal of Physics and Chemistry of Solids 51 (1990), S. 467-473

add to mindlist on the mindlist

Details

ISSN: 0022-3697

Keywords: Metal-non-metal transition ; chromium tungsten V oxide ; metal-metal pairs ; metallic resistivity ; metallic tungsten VIV oxides ; mixed valency oxides ; negative temperature coefficients ; semi-metal

Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002

Topics: Chemistry and Pharmacology , Physics

Type of Medium: Electronic Resource

URL: http://linkinghub.elsevier.com/retrieve/pii/0022-3697(90)90185-I

Permalink

Library	Location	Call Number	Volume/Issue/Year	Availability

Others were also interested in ...

Paper (German National Licenses)

Fulltext

Electronic Resource

Comparative study on the doping effect of 3d elements in Bi1.5Pb0.2Sr2Ca2Cu2.8M0.2O y (M=Sc, Ti, V, Cr, Mn, Fe, Co, Ni, or Zn) (1996)

Li, Youmo ; Li, Yanrong ; Hong, Guangyan ; [et al.]

Springer

Journal of superconductivity 9 (1996), S. 201-203

add to mindlist on the mindlist

Details

ISSN: 1572-9605

Keywords: Superconductor ; BiSrCaCuO ; doping

Source: Springer Online Journal Archives 1860-2000

Topics: Electrical Engineering, Measurement and Control Technology , Physics

Notes: Abstract With XRD,R-T, and acχ measurements a comparative study on the doping effects of 3d elements in Bi1.5Pb0.2Sr2Ca2Cu2.8M0.8O y (M = Sc, Ti, V, Cr, Mn, Fe, Co, Ni, or Zn) has been carried out. The effects of the former five members are significantly different, both on phase formed and onT c , from the latter four. It seems that the effect on phase stabilization correlates with the valency of the doped cation. In connection with the instability of the 2223 phase, the correlation has been discussed.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00728303

Permalink

Library	Location	Call Number	Volume/Issue/Year	Availability

Others were also interested in ...

Paper (German National Licenses)

Fulltext

Electronic Resource

Preparation and electrical and magnetic properties of Sr2-xNaxCuO3 (0 ≤ x ≤ 1) solid solutionsDedicated to Professor Rudolf Hoppe on his 70th Birthday (1992)

Shin, Y. J. ; Manova, E. D. ; Dance, J. M. ; [et al.]

Weinheim : Wiley-Blackwell

Zeitschrift für anorganische Chemie 616 (1992), S. 201-207

add to mindlist on the mindlist

Details

ISSN: 0044-2313

Keywords: Mixed-valence copper(II,III) oxide ; solid solutions ; semiconducting behavior ; electronic structure ; Chemistry ; Inorganic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Description / Table of Contents: Präparation sowie elektrische und magnetische Eigenschaften der festen Lösungen Sr2-xNaxCuO3 (0 ≤ x ≤ 1)Die festen Lösungen Sr2-xNaxCuO3 (0 ≤ x ≤ 1) mit Kupfer(II,III)-oxid wurden durch Feststoffreaktionen in Sauerstoffatmosphäre dargestellt. Alle diese festen Lösungen haben die Struktur von Sr2CuO3 (Raumgruppe Immm). Elektrische Leitfähigkeits- und EMK-Messungen zeigen Halbleiterverhalten im gesamten Bereich der Zusammensetzung. Die Elektronenstruktur des Sr2CuO3 wird mit der des La2CuO4 auf Basis eines ionisch-kovalenten Modells verglichen. Die Interpretation des Transportverhaltens deutet auf kleine Polaronen. Magnetische Suszeptibilitäts- und EPR-Messungen zeigen, daß die antiferromagnetische Ordnung des Sr2CuO3 abnimmt mit zunehmendem x. Die magnetischen Wechselwirkungen sind jedoch noch stark bei einer Kupferionen- Konzentration von x = 0,8.

Notes: Mixed-valence copper(II/III) oxide solid solutions Sr2-xNaxCuO3 (0 ≤ x ≤ 1) have been prepared by solid-state reactions in oxygen atmosphere. All solid solutions exhibit the structure of Sr2CuO3 (S.G. Immm). Electrical conductivity and thermoelectric power measurements show a semiconducting behavior in the whole composition range. The electronic structure of Sr2CuO3 is compared with that of La2CuO4 on the basis of an iono-covalent model. Interpretation of transport properties suggests the formation of small polarons. Magnetic susceptibility and EPR measurements show that the antiferromagnetic ordering of Sr2CuO3 tends to vanish as x increases, however magnetic interactions are still strong for a concentration of Cu2+ ions corresponding to x = 0.8.

Additional Material: 10 Ill.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/zaac.19926161033

Permalink

Library	Location	Call Number	Volume/Issue/Year	Availability

Others were also interested in ...

Paper (German National Licenses)

Fulltext

hits 1 - 3 | 3 hits