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

Journal Article · Wed Jan 07 00:00:00 EST 2015 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4905486· OSTI ID:22399210

Kemei, Moureen C. ^[1]; Harada, Jaye K. ^[1]; Seshadri, Ram ^[1]

---

1. Materials Research Laboratory, University of California, Santa Barbara, California 93106 (United States)

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.

• OSTI ID: 22399210
• Journal Information: Journal of Applied Physics, Vol. 117, Issue 1; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

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