Localized to Itinerant Electronic Transition in Perovskite Oxides, Volume 98 (Google eBook)

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John B. Goodenough, S.L. Cooper
Springer Science & Business Media, Feb 26, 2001 - Science - 239 pages
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Interest in the transition metal oxides with perovskite related structures goes back to the 1950s when the sodium tungsten bronzes NaxWO3 were shown to be metallic [1 ], the system Lal_xSr~MnO3 was found to contain a ferromagnetic conductive phase [2], and La0.sSr0.sCoO3 was reported to be a ferromagnetic metal, but with a peculiar magnetization of 1.5 #a/Co atom [3]. Stoichiometric oxide perovskites have the generic formula AMO3 in which the A site is at the center of a simple cubic array of M sites; the oxide ions form (180 ° 4)) M O M bridges to give an MO3 array of corner shared MO6/2 octahedra and the larger A cations have twelvefold oxygen coordination. Mismatch between the A O and M O equilibrium bond lengths introduces internal stresses. A compressive stress on the MO3 array is accommodated by a lowering of the M O M bond angle from 180 ° to (180 ° 4)); a tensile stress on the M O M bonds is accommodated by the formation of hexagonal polytypes [4].
  

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Page v - E-mail: michael.mingos@seh.ox.ac.uk Prof. Jean-Pierre Sauvage Faculte de Chimie Laboratoires de Chimie Organo-Minerale Universite Louis Pasteur 4, rue Blaise Pascal 67070 Strasbourg Cedex, France E-mail: sauvage@chimie.u-strasbg.fr Prof. Fred Wudl Department of Chemistry University of California LosAngeles, CA 90024-1569, USA E-mail: wudl@chem.ucla.edu Prof. Ian G. Dance Department of Inorganic and Nuclear Chemistry School of Chemistry University of New South Wales Sydney, NSW 2052, Australia E-mail:...
Page 115 - T. EGAMI Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, PA 19104-6272, USA G.
Page 161 - Materials Research Laboratory, and Science and Technology Center for Superconductivity University of Illinois at Urbana-Champaign 104 S.

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