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熱處理對(duì)FePt納米顆粒磁性能的影響
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蘭州理工大學(xué)科研發(fā)展基金（SB01200602）；甘肅省中青年自然科學(xué)基金（3YSO61-A25-025）；蘭州理工大學(xué)開(kāi)放課題基金（SKL07007）


Effect of Annealing Treatment on Magnetic Properties of FePt Nanoparticles
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    摘要:

    通過(guò)多重還原法制備FePt納米顆粒，并研究不同熱處理溫度對(duì)其磁性能影響。XRD及TEM分析表明：所制備的FePt納米顆粒為fcc結(jié)構(gòu)，顆粒為類球形且分散性較好，尺寸在5.0 nm左右。DSC及VSM顯示，高溫退火處理可以使FePt納米顆粒從無(wú)序的fcc相變成有序的fct相，隨著溫度的升高矯頑力變大，600 ℃時(shí)可達(dá)240 kA/m，但是在高溫區(qū)（550 ℃及以上）矯頑力的變化并不明顯，這主要是由高溫退火過(guò)程中納米顆粒的團(tuán)聚導(dǎo)致的。

    Abstract:

    FePt nanoparticles were prepared by multi-step reduction method. Effects of annealing temperatures on the magnetic properties of the nanoparticles were investigated. The results of XRD and TEM confirm that the as-synthesized FePt nanoparticles were fcc structure and monodisperse, with spherical shape and around 5.0 nm particle size. The results of DSC and VSM show that FePt nanoparticles would change into ordered fct structure after annealing at 500 °C for 30 min from disordered fcc structure. With the temperature increasing, the coercivity was increased, which was 240 kA/m at 600 °C. However, it changed slightly in the high-temperature region (550 °C and above it), which was attributed to the agglomeration of nanoparticles during the annealing treatment.

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杜雪巖,李 芳,馬應(yīng)霞,陳尹澤.熱處理對(duì)FePt納米顆粒磁性能的影響[J].稀有金屬材料與工程,2009,38(12):2163~2166.[Du Xueyan, Li Fang, Ma Yingxia, Chen Yinze. Effect of Annealing Treatment on Magnetic Properties of FePt Nanoparticles[J]. Rare Metal Materials and Engineering,2009,38(12):2163~2166.]
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  • 收稿日期:2008-11-28
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