On the Amorphous State of the Binary System of Nickel-Sulfur

We prepared the simultaneously electro-deposited Ni-S containing 0, 9, 13, 17 and 25 wt. % sulfur and studied their crystalline forms by X-ray diffraction patterns. The diffraction patterns of Ni-S containing 13 and 17% S show a uniform fog, and 7% S shows a halo, and 0 and 25% S are the same as those of Ni and Ni 3 S 2 respectively. All amorphous samples crystallized after they had been heated to 180°C, and their diffraction patterns show the crystalline states of the two phase region of Ni and Ni 3 S 2 . The electrical resistances of these samples were measured in a vacuum furnace and in an oil bath. The resistances of these samples containing 9, 13 and 17% S gradually decrease as the temperature increases and suddenly drop at 180°C, then follow the usual behavior of the common metals for both increasing and decreasing temperatures. In the case of 0% S it does not differ from that of the pure nickel. We conclude that the amorphous state has the structure of a certain regularity, and that 180°C is the tr...