Magnetic properties of phases possessing block type structures in the Nb2O5-2x system, with O<or=x<or=0.083

Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review

Autoren

  • C. H. Ruscher
  • M. Nygren

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Details

OriginalspracheEnglisch
Aufsatznummer011
Seiten (von - bis)3997-4003
Seitenumfang7
FachzeitschriftJournal of Physics: Condensed Matter
Jahrgang3
Ausgabenummer22
PublikationsstatusVeröffentlicht - 1991

Abstract

The magnetic susceptibility of phases with block type structures in the Nb2O5-2x system, with 0<or=x<or=0.083, has been determined by the Faraday method in the temperature region 77-400 K. The samples consisted of crystals of composition Nb28O70(Nb 2O5), Nb53O132(NbO2.491), Nb25O62(NbO2.480), Nb47O 116(NbO2.468), Nb22O54(NbO 2.454) and Nb12O29(NbO2.417). It is shown that the observed paramagnetic behaviour cannot be explained within the framework of classical Debye-Langevin behaviour or by Pauli paramagnetism. Instead, a Van Vleck type analysis of the magnetic susceptibility data gives evidence for the occurrence of bipolaron/single-polaron states at lower degrees of reduction (x<0.05), in agreement with previous interpretations of electrical and optical properties. The quasi-metallic state for x>or=0.05 reveals localized electrons, as suggested earlier.

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Magnetic properties of phases possessing block type structures in the Nb2O5-2x system, with O<or=x<or=0.083. / Ruscher, C. H.; Nygren, M.
in: Journal of Physics: Condensed Matter, Jahrgang 3, Nr. 22, 011, 1991, S. 3997-4003.

Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review

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abstract = "The magnetic susceptibility of phases with block type structures in the Nb2O5-2x system, with 028O70(Nb 2O5), Nb53O132(NbO2.491), Nb25O62(NbO2.480), Nb47O 116(NbO2.468), Nb22O54(NbO 2.454) and Nb12O29(NbO2.417). It is shown that the observed paramagnetic behaviour cannot be explained within the framework of classical Debye-Langevin behaviour or by Pauli paramagnetism. Instead, a Van Vleck type analysis of the magnetic susceptibility data gives evidence for the occurrence of bipolaron/single-polaron states at lower degrees of reduction (x<0.05), in agreement with previous interpretations of electrical and optical properties. The quasi-metallic state for x>or=0.05 reveals localized electrons, as suggested earlier.",
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TY - JOUR

T1 - Magnetic properties of phases possessing block type structures in the Nb2O5-2x system, with O<or=x<or=0.083

AU - Ruscher, C. H.

AU - Nygren, M.

PY - 1991

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N2 - The magnetic susceptibility of phases with block type structures in the Nb2O5-2x system, with 028O70(Nb 2O5), Nb53O132(NbO2.491), Nb25O62(NbO2.480), Nb47O 116(NbO2.468), Nb22O54(NbO 2.454) and Nb12O29(NbO2.417). It is shown that the observed paramagnetic behaviour cannot be explained within the framework of classical Debye-Langevin behaviour or by Pauli paramagnetism. Instead, a Van Vleck type analysis of the magnetic susceptibility data gives evidence for the occurrence of bipolaron/single-polaron states at lower degrees of reduction (x<0.05), in agreement with previous interpretations of electrical and optical properties. The quasi-metallic state for x>or=0.05 reveals localized electrons, as suggested earlier.

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