Evolution of structure and magnetic properties in electron-doped double perovskites, Sr{sub 2-x}La{sub x}MnWO{sub 6} (0=<x=<1)

Journal Article · Sun May 15 00:00:00 EDT 2005 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2004.12.031· OSTI ID:20725909

Qisheng, Lin ^[1]; Greenblatt, Martha ^[1]; Croft, Mark ^[2]

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1. Department of Chemistry and Chemical Biology, Rutgers, State University of New Jersey, Piscataway, NJ 08854 (United States)
2. Department of Physics, Rutgers, State University of New Jersey, Piscataway, NJ 08854 (United States)

Powder neutron and X-ray diffraction studies show that the double perovskites in the region 0=<x=<1 exhibit two crystallographic modifications at room temperature: monoclinic P2{sub 1}/n and tetragonal I4/m, with a boundary at 0.75<x<0.9. Magnetic susceptibility measurements indicate that for x=0 and 0.5 Sr{sub 2-x}La{sub x}MnWO{sub 6} orders antiferromagnetically (AFM) at 15 and 25K, respectively, for 0.75=<x<1.0, a contribution of weak ferromagnetism (FM), probably due to canted-AFM order, increases with increasing x. The end point compound SrLaMnWO{sub 6} shows the strongest FM cluster effect; however, no clear evidence of magnetic order is discernable down to 4.2K. X-ray absorption spectroscopy (XAS) confirms Mn{sup 2+} and mixed-valent W{sup 6+/5+} formal oxidation states in Sr{sub 2-x}La{sub x}MnWO{sub 6}.

• OSTI ID: 20725909
• Journal Information: Journal of Solid State Chemistry, Vol. 178, Issue 5; Other Information: DOI: 10.1016/j.jssc.2004.12.031; PII: S0022-4596(04)00676-0; Copyright (c) 2005 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ABSORPTION SPECTROSCOPY
CRYSTALLOGRAPHY
DOPED MATERIALS
ELECTRONS
FERROMAGNETISM
LANTHANUM COMPOUNDS
MAGNETIC SUSCEPTIBILITY
MANGANESE COMPOUNDS
MANGANESE IONS
MONOCLINIC LATTICES
NEUTRON DIFFRACTION
OXIDES
PEROVSKITE
STRONTIUM COMPOUNDS
TEMPERATURE RANGE 0273-0400 K
TETRAGONAL LATTICES
TUNGSTEN COMPOUNDS
TUNGSTEN IONS
X-RAY DIFFRACTION
X-RAY SPECTROSCOPY