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Title: Rapid preparation and magnetodielectric properties of trirutile Cr{sub 2}WO{sub 6}

Dense pellets of > 99% purity trirutile Cr{sub 2}WO{sub 6} were prepared in one step from starting oxides using spark plasma sintering, leading to simultaneous reaction and consolidation in 3 min at 1473 K. The reducing environment during processing may be partly responsible for the rapid reaction time in these oxides, with partial reduction of Cr{sup 3+} and the associated oxygen vacancies allowing rapid diffusion of cations. The low-temperature physical properties of Cr{sub 2}WO{sub 6} were examined, and a new transition at T = 5.9 K was observed as an anomaly in the temperature-dependent dielectric permittivity and a corresponding anomaly in the specific heat. A strong enhancement of the magnetocapacitance is observed below this transition temperature at T = 5.9 K and may be associated with a change from collinear spin order to more complex spin order.
Authors:
 [1] ;  [2] ;  [1] ;  [1] ;  [2] ;  [1] ;  [2] ;  [2]
  1. Materials Research Laboratory, University of California, Santa Barbara, California 93106 (United States)
  2. (United States)
Publication Date:
OSTI Identifier:
22399210
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 117; Journal Issue: 1; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; CATIONS; CHROMIUM COMPOUNDS; CHROMIUM IONS; DIELECTRIC MATERIALS; DIFFUSION; OXYGEN; PELLETS; PERMITTIVITY; REDUCTION; SINTERING; SPECIFIC HEAT; SPIN; TEMPERATURE DEPENDENCE; TRANSITION TEMPERATURE; TUNGSTATES; VACANCIES