Localized to Itinerant Electronic Transition in Perovskite Oxides
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Book Overview
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].
Format:Paperback
Language:English
ISBN:3642086969
ISBN13:9783642086960
Release Date:December 2010
Publisher:Springer
Length:239 Pages
Weight:0.80 lbs.
Dimensions:0.5" x 6.1" x 9.2"
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