B-site ordered perovskite LaSrMnNbO{sub 6}: Synthesis, structure and antiferromagnetism

Journal Article · Mon Nov 15 00:00:00 EST 2010 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2010.08.041· OSTI ID:21494125

Tao, Yang ^[1]; Perkisas, Tyche; Hadermann, Joke ^[2]; Croft, Mark ^[3]; Ignatov, Alexander ^[4]; Greenblatt, Martha ^[1]

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1. Department of Chemistry and Chemical Biology, Rutgers, the State University of New Jersey, 610 Taylor Road, Piscataway, NJ 08854-8087 (United States)
2. Electron Microscopy for Materials Research (EMAT), University of Antwerp, Groenenborgerlaan 171, 2020 Antwerp (Belgium)
3. Department of Physics and Astronomy, Rutgers, The State University of New Jersey, 136 Frelinghuysen Road, Piscataway, NJ 08854 (United States)
4. Materials Science and Engineering Department, Rutgers University, Piscataway, NJ 08854 (United States)

LaSrMnNbO{sub 6} has been synthesized by high temperature solid state reaction under 1% H{sub 2}/Ar dynamic flow. The structure is determined by Rietveld refinement of the powder X-ray diffraction data. It crystallizes in the monoclinic space group P2{sub 1}/n with the unit cell parameters: a=5.69187(12), b=5.74732(10), c=8.07018(15) A and {beta}=90.0504(29){sup o}, which were also confirmed by electron diffraction. The Mn{sup 2+} and Nb{sup 5+} ions, whose valence states are confirmed by X-ray absorption near-edge spectroscopy, are almost completely ordered over the B-site (<1% inversion) of the perovskite structure due to the large differences of both cationic size (0.19 A) and charge. The octahedral framework displays significant tilting distortion according to Glazer's tilt system a{sup -}b{sup -}c{sup +}. Upon heating, LaSrMnNbO{sub 6} decomposes at 690 {sup o}C under O{sub 2} flow or at 775 {sup o}C in air. The magnetic susceptibility data indicate the presence of long-range antiferromagnetic ordering at T{sub N}=8 K; the experimentally observed effective paramagnetic moment, {mu}{sub eff}=5.76 {mu}{sub B} for high spin Mn{sup 2+} (3d{sup 5}, S=5/2) is in good agreement with the calculated value ({mu}{sub calcd}=5.92 {mu}{sub B}). -- Graphical abstract: An ordered double perovskite, LaSrMnNbO{sub 6} has been synthesized in the monoclinic space group P2{sub 1}/n. The Mn{sup 2+} and Nb{sup 5+} ions, whose valence states are confirmed by X-ray absorption near-edge spectroscopy, are ordered over the B-site. The magnetic susceptibility data indicate long-range antiferromagnetic ordering at T{sub N}=8 K. Display Omitted

• OSTI ID: 21494125
• Journal Information: Journal of Solid State Chemistry, Vol. 183, Issue 11; Other Information: DOI: 10.1016/j.jssc.2010.08.041; PII: S0022-4596(10)00388-9; Copyright (c) 2010 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ABSORPTION
ABSORPTION SPECTROSCOPY
ANTIFERROMAGNETISM
CATIONS
ELECTRON DIFFRACTION
HEATING
HYDROGEN
LANTHANUM COMPOUNDS
MAGNETIC SUSCEPTIBILITY
MANGANESE COMPOUNDS
MANGANESE IONS
MONOCLINIC LATTICES
NIOBIUM COMPOUNDS
NIOBIUM IONS
OXIDES
PARAMAGNETISM
PEROVSKITE
SPACE GROUPS
SPIN
STRONTIUM COMPOUNDS
SYNTHESIS
TEMPERATURE RANGE 1000-4000 K
VALENCE
X-RAY DIFFRACTION
X-RAY SPECTROSCOPY
ALKALINE EARTH METAL COMPOUNDS
ANGULAR MOMENTUM
CHALCOGENIDES
CHARGED PARTICLES
COHERENT SCATTERING
CRYSTAL LATTICES
CRYSTAL STRUCTURE
DIFFRACTION
ELEMENTS
IONS
MAGNETIC PROPERTIES
MAGNETISM
MINERALS
NONMETALS
OXIDE MINERALS
OXYGEN COMPOUNDS
PARTICLE PROPERTIES
PEROVSKITES
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
REFRACTORY METAL COMPOUNDS
SCATTERING
SORPTION
SPECTROSCOPY
SYMMETRY GROUPS
TEMPERATURE RANGE
TRANSITION ELEMENT COMPOUNDS