Prasad Ch Sree Rama Linga, Sreenivasulu G, Kiran S Roopas, Balasubramanian M, Murty B S
Department of Metallurgical and Materials Engineering, Indian Institute of Technology, Madras, Chennai 600036, India.
J Nanosci Nanotechnol. 2011 May;11(5):4097-102. doi: 10.1166/jnn.2011.3852.
A new synthesis route with high energy ball milling and microwave sintering is used to obtain nanocrystalline BiFeO3 with improved dielectric and magnetic properties. Electrical and magnetic properties are compared with a conventionally sintered microcrystalline BiFeO3. It is found that the dielectric constant is increased more than one order of magnitude, electrical resistivity by six orders of magnitude and remnant polarization value is increased by 4-5 times for nanocrystalline BiFeO3 in comparison to conventionally sintered microcrystalline BiFeO3. Nanocrystalline BiFeO3 is seen to have ferromagnetic behavior whereas microcrystalline BiFeO3 is known to be antiferromagnetic.
采用高能球磨和微波烧结的新合成路线来制备具有改善的介电和磁性能的纳米晶BiFeO₃。将其电学和磁学性能与传统烧结的微晶BiFeO₃进行比较。结果发现，与传统烧结的微晶BiFeO₃相比，纳米晶BiFeO₃的介电常数增加了一个多数量级，电阻率增加了六个数量级，剩余极化值增加了4至5倍。纳米晶BiFeO₃表现出铁磁行为，而微晶BiFeO₃已知为反铁磁体。
