Synthesis, crystal structure and magnetic properties of a new pillared perovskite La{sub 5}Mo{sub 2.75}V{sub 1.25}O{sub 16}

Journal Article · Mon Dec 15 00:00:00 EST 2008 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2008.09.012· OSTI ID:21212146

Ramezanipour, Farshid; Derakhshan, Shahab ^[1]; Greedan, John E ^[1]; Cranswick, Lachlan M.D. ^[2]

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1. Department of Chemistry, McMaster University, Hamilton, Ontario, L8S 4M1 (Canada)
2. Canadian Neutron Beam Centre, National Research Council, Chalk River Laboratories, Chalk River, Ontario, K0J 1J0 (Canada)

A new pillared perovskite compound La{sub 5}Mo{sub 2.76(4)}V{sub 1.25(4)}O{sub 16}, has been synthesized by solid-state reaction and its crystal structure has been characterized using powder X-ray and neutron diffraction. The magnetic properties of this compound have been investigated using SQUID magnetometry, and the magnetic structure has been studied using neutron diffraction data. A theoretical calculation of relative strengths of spin interactions among different magnetic ions and through different pathways has been performed using extended Hueckel, spin dimer analysis. The crystal structure of this material contains perovskite-type layers that are connected through edge-sharing dimeric units of octahedra. The structure is described in space group C2/m with unit cell parameters a=7.931(2) A, b=7.913(2) A, c=10.346(5) A and {beta}=95.096(5){sup o}. The material shows both short-range ferrimagnetic correlations from {approx}200 to 110 K and long-range antiferromagnetic order below T{sub c}{approx}100 K. The magnetic structure was investigated by neutron diffraction and is described by k=(0 0 1/2 ) as for other pillared perovskites. It consists of a ferrimagnetic arrangement of Mo and V within the layers that are coupled antiferromagnetically between layers. This is the first magnetic structure determination for any Mo-based pillared perovskite. - Graphical abstract: Long-range magnetic order below 100 K in the pillared perovskite La{sub 5}Mo{sub 2.75}V{sub 1.25}O{sub 16}. The magnetic structure is shown in the inset.

• OSTI ID: 21212146
• Journal Information: Journal of Solid State Chemistry, Vol. 181, Issue 12; Other Information: DOI: 10.1016/j.jssc.2008.09.012; PII: S0022-4596(08)00483-0; Copyright (c) 2008 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
ANTIFERROMAGNETISM
CRYSTALS
INTERACTIONS
LANTHANUM COMPOUNDS
LAYERS
MAGNETIC PROPERTIES
MOLYBDENUM COMPOUNDS
MONOCLINIC LATTICES
NEUTRON DIFFRACTION
OXIDES
PEROVSKITE
SPACE GROUPS
SPIN
SQUID DEVICES
SYNTHESIS
VANADIUM COMPOUNDS
X-RAY DIFFRACTION