STUDIES OF MOS2 STRUCTURES PRODUCED BY ELECTRON-IRRADIATION

In this letter, we report the study of MoS2 crystals after irradiation with a high dose of electrons. A pelletron accelerator was used to ir radiate the sample with electrons at an energy of 0.5 MeV. Samples wer e examined in high resolution electron microscopy. Two main structures were observed: onion layers with fullerene like structure and others with their planes rotated with respect to each other by well-defined a ngles. We present a calculation showing that relative rotation of the sulphur layers by 3 degrees, 5 degrees, 8 degrees, and 16 degrees basi cally have the same average energy as the unrotated structure. Therefo re rotations of the layers through those angles will be favored. Insta bility on the structure produced by irradiation will induce rotations on the structure. (C) 1996 American Institute of Physics.