Ce3Al11塊材在低溫時有一鐵磁性相變及反鐵磁相變，轉變溫度分別為TC=6.2K及TN=3.2K。本實驗在發展一套利用雷射蒸鍍製作奈米微粒的製程，主要原理利用高能的Nd:YAG脈衝式雷射聚焦在靶材上使靶材經過蒸發-凝聚-冷凝的過程形成奈米微粒。我們控制雷射波長、靶材到基板的間距及通入的氣體並製作出Ce3Al11微粒，使用TEM及SEM檢測其粒徑並發現基板到靶材的間距是控制粒徑的主要參數。本研究亦於液體中製得Ce3Al11微粒並發現控制雷射波長及環境溫度可以控制粒徑。 The bulk Ce3Al11 undergoes a ferromagnetic transition at Tc=6.2K, follow by an antiferromagnetic ordering at TN=3.2K.This research, we develop a Pulsed Laser Deposition System which working with a Nd:YAG laser. Ce3Al11 were fabricated by controlling the distance between substrate and target with different gas and wavelength of laser. The sizes of nanoparticles were checked by TEM and SEM. We find the distance between target and substrate is main factor to change the size of nanoparticle. The Liquid-Pulsed-Laser(LPLD) process is also developed to fabricate the particles. The smaller nanoparticles can be obtained by shorter wavelength of laser in LPLD process.
