Title
Mn(I) in an extended oxide : the synthesis and characterization of <tex>$La_{1-x}Ca_{x}MnO_{2+\delta}$</tex> (<tex>$0.6\leq x\leq1$</tex>) Mn(I) in an extended oxide : the synthesis and characterization of <tex>$La_{1-x}Ca_{x}MnO_{2+\delta}$</tex> (<tex>$0.6\leq x\leq1$</tex>)
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
article
Publication
Washington, D.C. ,
Subject
Physics
Chemistry
Source (journal)
Journal of the American Chemical Society. - Washington, D.C.
Volume/pages
133(2011) :45 , p. 18397-18405
ISSN
0002-7863
ISI
000297381200065
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
Reduction of La1xCaxMnO3 (0.6 ≤ x ≤ 1) perovskite phases with sodium hydride yields materials of composition La1xCaxMnO2+δ. The calcium-rich phases (x = 0.9, 1) adopt (La0.9Ca0.1)0.5Mn0.5O disordered rocksalt structures. However local structure analysis using reverse Monte Carlo refinement of models against pair distribution functions obtained from neutron total scattering data reveals lanthanum-rich La1xCaxMnO2+δ (x = 0.6, 0.67, 0.7) phases adopt disordered structures consisting of an intergrowth of sheets of MnO6 octahedra and sheets of MnO4 tetrahedra. X-ray absorption data confirm the presence of Mn(I) centers in La1xCaxMnO2+δ phases with x < 1. Low-temperature neutron diffraction data reveal La1xCaxMnO2+δ (x = 0.6, 0.67, 0.7) phases become antiferromagnetically ordered at low temperature.
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