Bismuth manganite with the {open_quotes}2212{close_quotes} structure: Bi{sub 2-x}Pb{sub x}Sr{sub 1.5}Mn{sub 2}O{sub 9-{delta}}
- ISMRA-Universite de Caen (France)
A manganite Bi{sub 2-x}pb{sub x}Sr{sub 1.5}Mn{sub 2}O{sub 9-{delta}}, with the 2212 structure, has been synthesized for the first time. Its structural study by powder X-ray diffraction and by electron microscopy has been performed for two compositions, x = 0.5 and x = 1. The average structure consists of double perovskite layers (P) involving MnO{sub 6} octahedra and MnO{sub 5} pyramids intergrown with distorted triple rock salt layers (RS). The perovskite cages are mainly occupied by strontium so that these phases can be formulated [Bi{sub 2-x}Pb{sub x}CA{sub 1.33}Sr{sub 0.67}]{sub RS}[Sr{sub 0.83}CA{sub 0.17}]{sub P}Mn{sub 2}O{sub 9-{delta}}. The HREM investigation shows that the composition x = 0.5 exhibits an incommensurate modulated structure similar to that observed for the superconducting bismuth cuprate and for the iron-based 2212 compound. In contrast, the composition x = 1 does not exhibit any modulation. Although they are rare, some extended defects are observed especially for BiPbSr{sub 1.5}Ca{sub 1.5}Mn{sub 2}O{sub 9-{delta}}. Both oxides are semiconductors.
- OSTI ID:
- 569704
- Journal Information:
- Journal of Solid State Chemistry, Vol. 132, Issue 2; Other Information: PBD: Sep 1997
- Country of Publication:
- United States
- Language:
- English
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