材料科学
纳米颗粒
顺磁性
磁化
反铁磁性
居里温度
相变
磁性纳米粒子
凝聚态物理
分析化学(期刊)
结晶学
铁磁性
纳米技术
化学
磁场
有机化学
物理
量子力学
作者
Jan Ungelenk,Sabine Roming,Peter Adler,Walter Schnelle,Jürgen Winterlik,Claudia Felser,Claus Feldmann
标识
DOI:10.1016/j.solidstatesciences.2015.06.004
摘要
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.
科研通智能强力驱动
Strongly Powered by AbleSci AI