文章編號：1004-0609(2022)-03-0836-09
強磁場對FePt納米粒子液相生長速率的影響
吳純1, 2，鞠玉萍1，江亞男1，董世知1，任鑫1，裴文利3，王凱2，王強2
(1. 遼寧工程技術(shù)大學材料科學與工程學院，阜新 123000；
2. 東北大學材料電磁過程研究教育部重點實驗室，沈陽 110819；
3. 東北大學材料各向異性與織構(gòu)教育部重點實驗室，沈陽 110819)
摘 要: 本文使用定量金相法分析了6 T強磁場對FePt晶體、方向生長行為的影響機制。結(jié)果表明：FePt晶體液相生長包括、方向的快速生長和緩慢生長兩個階段。強磁場通過降低原子濃度、抑制原子擴散、抑制表面活性劑吸附等方式降低生長速率和生長距離，細化晶粒。強磁場通過增強磁晶各向異性、影響—NH2官能團在(100)面吸附、促進Fe原子在(100)面吸附生長等方式，減小方向生長速率的降低幅度，使生長過程中FePt晶體形狀從截角立方體向立方體和凹立方體轉(zhuǎn)變所需時間增加，使相同生長時間時晶體形狀從立方體轉(zhuǎn)變?yōu)榻亟橇⒎襟w、從凹立方體轉(zhuǎn)變?yōu)榻亟橇⒎襟w和立方體。
關(guān)鍵字: 強磁場；FePt納米粒子；生長速率；形狀轉(zhuǎn)變
Effect of high magnetic field on liquid-phase growth rate of FePt nanoparticles
WU Chun1, 2, JU Yu-ping1, JIANG Ya-nan1, DONG Shi-zhi1, REN Xin1, PEI Wen-li3, WANG Kai2, WANG Qiang2
（1. School of Materials Science and Engineering, Liaoning Technical
University, Fuxin 123000, China;
2. Key Laboratory of Electromagnetic Processing of
Materials, Northeastern University, Shenyang 110819, China;
3. Key Laboratory of Anisotropy and Texture of
Materials, Northeastern University, Shenyang 110819, China）
Abstract:A quantitative metallographic method has been employed to analyze the effect of the 6 T high magnetic field on growth behavior of FePt crystals along and directions. The results indicate that the liquid-phase growth of FePt crystals includes two stages, rapid growth and slow growth along the and directions. The high magnetic field reduces the growth rates and distances along the and directions by reducing the concentration of atoms, inhibiting the diffusion of atoms, and inhibiting the adsorption of surfactants. Thus, the crystal grains are refined. The high magnetic field reduces the decreasing degree of growth rate along the direction by enhancing the magnetocrystalline anisotropy, affecting the adsorption of —NH2 functional groups on the (100) face, and promoting the deposition of Fe atoms on the (100) face, leading to the increase of time required for FePt crystals shape transition from truncated-cubes to cubes and concave-cubes during the growth processes. Otherwise, when using the same growth time, the crystal shapes transit from cube to truncated-cube, from concave-cube to truncated-cube and cube under the high magnetic field.
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