(Fe_(1-x)Co_x)_3BO_5纳米棒磁性的研究

Magnetic properties of (Fe_(1-x)Co_x)_3BO_5 nanorods

本文采用高温有机溶剂法制备了(Fe1-xCox)3BO5纳米棒,通过控制反应物中乙酰丙酮钴的含量合成了不同Co含量的(Fe1-xCox)3BO5.利用高分辨透射电子显微镜(HRTEM)、超导量子干涉磁强计(SQUID)对其形貌和磁性能进行了表征.高分辨透射电子显微镜结果表明制备出的纳米(Fe1-xCox)3BO5为多晶棒状,且具有多折孪晶结构;磁性测量的结果表明,(Fe1-xCox)3BO5纳米棒在室温下表现出铁磁性,随着Co含量的增加,纳米棒的铁磁性逐渐增加,该纳米棒有望用来研究生物大分子的机械性能.

Cobalt-doped ferroferriborate （（Fe1？xCox）3BO5） nanorods （NRs） have been synthesized by using a high-temperature organic-solution-phase method, and characterized by high resolution transmission electron microscope （HRTEM） and SQUID. The aspect ratios of the NRs are tuned by reductive decomposition of Fe（acac）3 and Co（acac）2 with a predetermined ratio. HRTEM showS that the sample is polycrystalline NRs and the top view of a NR tip reveals a multiply-twined structure. Magnetization curves indicate that （Fe1？xCox）3BO5 NRs are ferromagnetic above room temperature and the antiferromagnetic component is included, the magnetic properties are dramatically modified by Co substitutional doping. The NRs are expected to be used to study the mechanical properties of biological macromolecules.