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Citation: Bian Guo-Zhu, Yin Ya-Dong, Fu Yi-Lu, Wu Zhong-Hua, Hu Tian-Dou, Liu Tao. Preparation and Crystallization of Nanosized Amorphous Nickel Sulfide by Using γ -irradiation[J]. Acta Physico-Chimica Sinica, ;2000, 16(01): 55-59. doi: 10.3866/PKU.WHXB20000111 shu

Preparation and Crystallization of Nanosized Amorphous Nickel Sulfide by Using γ -irradiation

1.
Department of Chemical Physics,Department of Applied Chemistry,University of Science and Technology of China,Hefei 230026

Received Date: 26 April 1999
Available Online: 15 January 2000

Nano-sized amorphous nickel sulfide has been prepared in a mixed aqueous solution of Na2S2O3 and Ni2SO4 compounds using r-irradiation at room temperature. The obtained precipitate after r-irradiation was washed and dried at 60℃. It was then crystallized by calcination in a now of ar n at 160 -- 500℃, respectively. All these samples were characterized by X-ray diffraction and extended X-ray absorption fine structure (EXAFS) spectroscope. No peak is detected in the X-ray diffraction patterns of 60℃ dried and 160℃ calcined samples, it reveals that particles in these two samples are in amorphous states with high level of disorder. Several weak peaks are found in the pattern of 300℃ calcined sample and they become stronger in that of 400℃ and 500℃ calcined samples. All these peaks are due to NiS compound. EXAFS results demonstrate that the nickel sulfide particles in 60℃ dried sample are present in a tetrahetral structure with an average Ni -- S coordination distance of 0. 221nm and a Ni - S coordination number of 4.4, which are changed to octahedral structures with Ni - S coordination distances of about 0. 238nm and Ni - S coordination numbers of near 6.0 after calcined at above 300℃. Both the tetrahedral species and the octahedral species exist in 160℃ calcined sample.
- γ-irradiation,
- Nanosized amorphous nickel sulfide,
- Structure,
- X-ray diffraction,
- EXAFS
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