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RESEARCH PRODUCT
Ultrafine MnWO4 nanoparticles and their magnetic properties
Claudia FelserClaus FeldmannPeter AdlerJürgen WinterlikWalter SchnelleJan UngelenkSabine Romingsubject
Materials scienceMagnetismAnalytical chemistryNanoparticleNanotechnologyGeneral ChemistryCondensed Matter PhysicsMagnetizationParamagnetismDynamic light scatteringTransmission electron microscopyAntiferromagnetismGeneral Materials ScienceMultiferroicsdescription
Abstract Ultrafine nanoparticles of MnWO4, a compound showing low-temperature multiferroicity in the bulk, were synthesized by the polyol method. Studies using powder X-ray diffraction, scanning and transmission electron microscopy, dynamic light scattering, differential sedimentation and sorption techniques show the formation of a single-phase material, which is composed of MnWO4 nanoparticles with a prolate ellipsoidal shape (short axis of 4–5 nm, long axis of 11–12 nm) and an unprecedented high specific surface area of 166 m2 g−1. The as-prepared MnWO4 nanoparticles are readily crystalline after the liquid-phase synthesis. Temperature and field dependent magnetization measurements indicate antiferromagnetic behavior with a single magnetic phase transition near TN ≈ 6 K. In contrast, three successive transitions below 14 K were reported for multiferroic bulk-MnWO4. Above TN, the nanoparticles show Curie–Weiss-type paramagnetic behavior. Due to the large paramagnetic moment of Mn2+ (μeff ≈ 6.2 μB), the nanoparticles can be easily manipulated by a bar magnet at ambient temperature.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2015-08-01 | Solid State Sciences |