Large coercivity FePt nanoparticles prepared via a one-step method without post-annealing
Large coercivity FePt nanoparticles prepared via a one-step method without post-annealing
复制标题
DOI：
10.1063/1.4972185
复制
发表时间：
2016-12
影响因子：
4
通讯作者：
Xinwei Zhang;F. Xiong;Xiaohong Jiang;Z. Hua;Chunlei Wang;Shaoguang Yang
中科院分区：
文献类型：
--
作者：
Xinwei Zhang;F. Xiong;Xiaohong Jiang;Z. Hua;Chunlei Wang;Shaoguang Yang
以无毒的硝酸铁、六氯铂酸和甘氨酸为原料，采用溶胶-凝胶自燃烧法一步合成了L10 FePt纳米粒子。与普通合成相比，不需要高温后退火来形成L10 FePt相。整个点火燃烧过程不超过一分钟。L10 FePt相可以在存在由放热燃烧反应引起的高温下形成。调整甘氨酸与金属离子的摩尔比从0.5到6.0允许其对产品的相变和磁性能的影响进行调查。X射线衍射表明，纯相L10 FePt得到甘氨酸与金属离子的摩尔比为1.5。透射电子显微镜表明，单分散的L10 FePt纳米颗粒具有约20 nm的平均粒径。L10 FePt纳米粒子未发生团聚和烧结的原因可能是由于大分子量的FePt纳米粒子的存在。
L10 FePt nanoparticles were synthesized by a one-step sol-gel autocombustion method, using nontoxic ferric nitrate, hexachloroplatinic acid, and glycine as starting materials. In contrast to common syntheses, high-temperature post-annealing was not required to form the L10 FePt phase. The entire ignition and combustion process lasted no more than one minute. The L10 FePt phase could form in the presence of the high temperature caused by the exothermic combustion reaction. Adjusting the glycine-to-metal ion molar ratio from 0.5 to 6.0 allowed its effects on the phase transformation and magnetic properties of the products to be investigated. X-ray diffraction indicated that pure phase L10 FePt was obtained at a glycine-to-metal ion molar ratio of 1.5. Transmission electron microscopy indicated that the monodisperse L10 FePt nanoparticles had an average particle size of about 20 nm. The reasons why the as-synthesized L10 FePt nanoparticles were not aggregated and sintered could be attributed to the large amo...