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Annealed Crystallization of Ni-B and Ni-Ce-B Ultrafine Amorphous Alloys Studied by EXAFS

EXAFS technique was used to quantitatively determine the local structure evolutions of Ni B and Ni Ce B ultrafine amorphous alloys prepared by chemical reduction during the annealed process. The results show that the average bond length R j, coordination number N , thermal disorder factor σ T and static disorder factor σ S are 0.275 nm, 11.9, 0.006 9 nm, 0.034 nm; 0.215 nm, 2.7, 0.005 5 nm, 0.003 8 nm, and 0.276 nm, 12.4, 0.006 7 nm, 0.035 nm; 0.214 nm, 2.9, 0.005 8 nm, 0.004 2 nm for the Ni Ni and Ni B first neighbor shells of Ni B and Ni Ce B ultrafine amorphous alloys, respectively. It is indicated that the σ S of Ni Ni shell is rather larger, about four or five times as large as that of σ T, and one order larger than that of σ S of Ni B shell. Ni B sample is crystallized after being annealed at 300 ℃, and its R Ni—Ni as well as σ S are 0.254 nm and 0.011 nm, respectively. However, the crystallization temperature of Ni Ce B sample increases about 100 ℃ due to the addition of 0.3% Ce element. The local structure around Ni atom for the Ni B sample annealed at 500 ℃ is fully similar to that of Ni foil. For the Ni Ce B samples annealed at 500 ℃, the σ S of Ni Ni shell is 0.007 3 nm and the N of Ni B shell is 1.2. It implies that the Ni lattice produced from the crystallization of Ni Ce B amorphous alloys is significantly distorted and the interaction between Ni and B atoms is strongly increased by the effect of Ce element.