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Citation: ZHENG Yi-Xiong, YAO Shi-Bing, ZHOU Shao-Min. Preparation and Annealing Crystallization of Ni-La-B Amorphous Alloy Nanoclusters by W/O Microemulsion[J]. Chinese Journal of Applied Chemistry, ;2008, 25(2): 224-228. shu

Preparation and Annealing Crystallization of Ni-La-B Amorphous Alloy Nanoclusters by W/O Microemulsion

1.
a College of Material Science and Engineering, Huaqiao University, Quanzhou 362021;
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b State Key Laboratory of Physicl Chemistry of Solid Surface, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005

Corresponding author: ZHENG Yi-Xiong,
Received Date: 26 February 2007
Available Online: 24 May 2007

The nearly monodispersed Ni-La-B amorphous alloy nanocluster was prepared from the reduced reaction of Ni(Ac)₂ and La(NO₃)₃ by KBH₄ in W/O microemulsion.Samples were characterized by SEM,TEM,XRD,DSC and XPS.The results show that the sample exhibits a spherical morphology with a size of around 10~15 nm and an even size distribution.The DSC curves show that there are exothermic peaks corresponding to phase transition at 657.6 K and 724.3 K at a heating rate of 20 K/min.The crystallization temperature of the sample is significantly higher than that of the nano Ni-B amorphous alloy powder obtained by chemical reduction with KBH₄ in aqueous solution.Thus,the Ni-La-B amorphous alloy nanocluster prepared by microemulsion method has excellent thermal stability.The XRD results identify the two phase transition steps as determined by DSC analysis:one is the transformation of Ni-La-B amorphous alloy into Ni-La-B crystalline alloy,the other is the decomposition of Ni-La-B crystalline alloy into Ni-La crystalline alloy and release of B.The rate of the latter is higher than that of the former,which has been found via determining phase transition activation energy.
- Ni-La-B amorphous alloy,
- microemulsion,
- nanocluster,
- crystallization,
- monodisperse
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