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Effect of cooling rate on size-dependent atomic ordering of CoPt nanoparticles

机译：冷却速率对CoPt纳米粒子尺寸依赖性原子有序化的影响

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We report on the effect of cooling rate on the size-dependent atomic ordering of CoPt nanoparticles using aberration corrected high-resolution transmission electron microscopy. It was found that cooling rate plays a crucial role in promoting atomic ordering during the cooling process after annealing. Nanoparticles of ≈3 nm in diameter show the A1-disordered phase after annealing at 873 K for 1 h followed by rapid cooling (110 K/min), while the L10-ordered phase is obtained when the cooling rate is slow (1.5 K/min). The disordered phase is also obtained by rapid cooling after annealing at 973 K for 1 h. These results unambiguously indicate that the order-disorder transformation temperature is reduced to a temperature at least lower than 873 K for CoPt nanoparticles smaller than 3 nm in diameter. The slow cooling process promotes the atomic ordering, which resulted in an enhancement of magnetic coercivity as high as 2200 Oe. This study demonstrates that hard magnetic properties of the CoPt nanoparticles can be improved by controlling the cooling rate after heat treatments.View full textDownload full textKeywordsmagnetic nanoparticles, ordered intermetallics, transmission electron microscopy, CoPt, cooling rate, size effectRelated var addthis_config = { ui_cobrand: "Taylor & Francis Online", services_compact: "citeulike,netvibes,twitter,technorati,delicious,linkedin,facebook,stumbleupon,digg,google,more", pubid: "ra-4dff56cd6bb1830b" }; Add to shortlist Link Permalink http://dx.doi.org/10.1080/09500839.2012.685188
机译：我们报告使用像差校正高分辨率透射电子显微镜观察冷却速率对CoPt纳米粒子尺寸依赖的原子有序化的影响。发现在退火后的冷却过程中，冷却速率在促进原子有序化中起关键作用。直径≥3 nm的纳米粒子在873 K退火1 h后迅速冷却（110 K / min），然后L1 0 <冷却速度较慢（1.5 K / min）时，获得/ sub>有序相。无序相还可以通过在973 K退火1小时后快速冷却来获得。这些结果清楚地表明，对于直径小于3 nm的CoPt纳米颗粒，有序-无序转变温度降低到至少低于873K。缓慢的冷却过程促进了原子的有序化，从而导致了高达2200 Oe的磁矫顽力的增强。这项研究表明，通过控制热处理后的冷却速率可以改善CoPt纳米粒子的硬磁性能。查看全文下载全文关键词磁性纳米粒子，有序金属间化合物，透射电子显微镜，CoPt，冷却速率，尺寸效应相关var addthis_config = {ui_cobrand： “泰勒和弗朗西斯在线”，services_compact：“ citeulike，netvibes，twitter，technorati，delicious，linkedin，facebook，stumbleupon，digg，google，更多”，发布：“ ra-4dff56cd6bb1830b”};添加到候选列表链接永久链接http://dx.doi.org/10.1080/09500839.2012.685188

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