Structural and magnetic study of the cation-ordered perovskites Ba{sub 2-} {sub x} Sr {sub x} ErMoO{sub 6}
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD (United Kingdom), E-mail: Edmund.Cussen@nottingham.ac.uk
A series of perovskite phases have been prepared from the appropriate carbonates and oxides by heating under reducing conditions at temperatures up to 1300 deg. C. Complete ordering between ErO{sub 6} and MoO{sub 6} octahedra and a disordered distribution of Sr{sup 2+} and Ba{sup 2+} occur in all compounds. Neutron powder diffraction experiments show that the substitution of Sr{sup 2+} into Ba{sub 2}ErMoO{sub 6} introduces a progressive reduction in symmetry from Fm3-barm (x=0) to I4/m (x=0.5, 0.8) to P2{sub 1}/n (x=1.25, 1.75, 2.0). Magnetic susceptibility measurements indicate that all of these compounds show Curie-Weiss paramagnetism and that for x<1.25 this behaviour persists down to 2 K. The monoclinically distorted compounds show magnetic transitions at low temperature and neutron diffraction has confirmed the presence of long-range antiferromagnetic order below 2.5 and 4 K in Ba{sub 0.25}Sr{sub 1.75}ErMoO{sub 6} and Sr{sub 2}ErMoO{sub 6}, respectively. Ba{sub 0.75}Sr{sub 1.25}ErMoO{sub 6}, Ba{sub 0.25}Sr{sub 1.75}ErMoO{sub 6} and Sr{sub 2}ErMoO{sub 6} do not undergo structural distortion on cooling from room temperature. - Graphical abstract: Introduction of Sr{sup 2+} into the double perovskite Ba{sub 2}ErMoO{sub 6} introduces increasingly large distortions from cubic symmetry and permits antiferromagnetic order at T {sub N}{<=}4 K.
- OSTI ID:
- 21015673
- Journal Information:
- Journal of Solid State Chemistry, Vol. 180, Issue 2; Other Information: DOI: 10.1016/j.jssc.2006.11.007; PII: S0022-4596(06)00592-5; Copyright (c) 2006 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
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ANTIFERROMAGNETISM
BARIUM COMPOUNDS
BARIUM IONS
CARBONATES
CUBIC LATTICES
ERBIUM COMPOUNDS
MAGNETIC SUSCEPTIBILITY
MOLYBDENUM COMPOUNDS
MONOCLINIC LATTICES
NEUTRON DIFFRACTION
OXIDES
PARAMAGNETISM
PEROVSKITE
STRONTIUM COMPOUNDS
STRONTIUM IONS
TEMPERATURE RANGE 0000-0013 K
TEMPERATURE RANGE 1000-4000 K
TETRAGONAL LATTICES