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Title: Structure and magnetic interactions in the solid solution Ba{sub 3−x}Sr{sub x}Cr{sub 2}O{sub 8}

Highlights: • We describe for the first time the preparation of single- and polycrystalline members of the solid solution Ba{sub 3−x}Sr{sub x}Cr{sub 2}O{sub 8}. • We report on the structural changes in the solid solution at room temperature depending on the stoichiometry. • We describe the peculiar change of the magnetic behavior in the solid solution with the stoichiometry. - Abstract: Solid solutions of the magnetic insulators Ba{sub 3}Cr{sub 2}O{sub 8} and Sr{sub 3}Cr{sub 2}O{sub 8} (Ba{sub 3−x}Sr{sub x}Cr{sub 2}O{sub 8}) have been prepared in polycrystalline form for the first time. Single crystalline material was obtained using a mirror image floating zone technique. X-ray diffraction data taken at room temperature indicate that the space group of Ba{sub 3−x}Sr{sub x}Cr{sub 2}O{sub 8} remains unchanged for all values of x, while the cell parameters depend on the chemical composition, as expected. Magnetization data, measured from 300 K down to 2 K, suggest that the interaction constant J{sub d} within the Cr{sup 5+} dimers varies in a peculiar way as a function of x, starting at J{sub d} = 25 K for x = 0, then first slightly dropping to J{sub d} = 18 K for x ≈ 0.75, before reaching J{sub d}more » = 62 K for x = 3.« less
Authors:
 [1] ;  [1] ;  [2] ;  [3] ;  [2] ;  [4] ;  [4]
  1. Universität Zürich, Physik-Institut, Winterthurerstr. 190, CH-8057 Zürich (Switzerland)
  2. Department of Physics and Astronomy, McMaster University, Hamilton, Ontario L8S 4M1 (Canada)
  3. Brockhouse Institute for Materials Research, McMaster University, Hamilton, Ontario L8S 4M1 (Canada)
  4. (Canada)
Publication Date:
OSTI Identifier:
22341753
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Research Bulletin; Journal Volume: 48; Journal Issue: 9; Other Information: Copyright (c) 2013 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CHEMICAL COMPOSITION; CHROMIUM IONS; CRYSTAL STRUCTURE; INTERACTIONS; MAGNETIC PROPERTIES; MAGNETIZATION; MONOCRYSTALS; OXIDES; POLYCRYSTALS; SOLID SOLUTIONS; SPACE GROUPS; X-RAY DIFFRACTION; ZONE MELTING