[Article] Factors affecting the severity of motor vehicle

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13. M. E. E. P. Flynn, J. Phys. Fll, L223 (1981). 14. C. Eklund, (this volume) p. 337. 15. A. R. J. S. Dresselhaus, Phys. Rev. R. J. M. Horn, Phys. Rev. Lett. 53,985 (1984). 16. P. H. Geballe, Phys. Rev. B29, 4961 (1984). 17. S. W. R. Beasley, Phys. Rev. B26,4894 (1982). 18. M. K. L. C. Giessen, (Academic Press, Orlando, Florida, 1985) p. 339. 19. J. B. McWhan, M. M. C. E. Cunningham, "Layered Structures, Epitaxy and Interfaces", Proceedings of the Materials Research Society, Vol. M. R. Dawson, p.

2Ha and 2H b). Thus the simplest poly type with octahedral coordination, labelled IT, has a repeat perpendicular to the layers of one sandwich, and trigonal symmetry; and the simplest trigonal prismatic coordination poly types have two sandwich repeats, and are designated 2H~ and 2Hb. The 2H structure is adopted by metallic group V materials such as NbS 2, and stacks the metal atoms trrectly above each other along the c axis, whilst in the 2Hb structure, adopted by semiconducting group VI materials such as MoS 2, the metal atoms are staggered.

We will discuss the effects on band structures of increasing the number of d electrons later. 'The metal dihalides also form layer structures, but they are usually hygroscopic and are more ionic. Although interesting in their own right, they will not be discussed here. Table 1. The transition metal elements, T, which readily form layered dichalcogenide crystals, TX2, where X=S, Se. Group IV Ti 'h: Hf V VI V Nb Ta [Cr] Mo W In addition to the hierarchy of the degree of anisotropy, there is also a varying degree of ionicity in the bonding between metal atoms and chalcogen atoms.

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