Localized to itinerant electronic transition in perovskite oxides / volume editor, J.B. Goodenough ; with contributions by S.L. Cooper ... [et al.]
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- Springer e-books
- 出版： Berlin : New York :Springer c2001
- 叢書名： Structure and bonding ,98
- 主題： Oxides. , Transition metal oxides. , Perovskite.
- ISBN： 9783540675228 (paper)
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- 系統號： 005168066 | 機讀編目格式
館藏資訊
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].