By J. D. Joannopoulos (auth.), E. Gerlach, P. Grosse (eds.)
Conferences at the Physics of Selenium and Tellurium have been held in 1964 in London, 1967 in Montreal, and 8 years in the past, 1971, in Pont-a-Mousson. The final convention used to be noteworthy as a result of proof: For crystalline Te and Se a excessive point of effects was once completed and, extra, it was once attainable to stipulate the focal issues for carrying on with examine paintings. those issues have been mostly to discover. the digital constitution of trigonal Se and Te and of the hypothetic~l cubic restrict of those fabrics. To im plement such research, growth in band constitution calculations used to be useful. additionally, a constant analytical description of the bands close to the va lence band conduction band hole was once required with the purpose to appreciate the semiconducting houses, customarily magnetotransport and magnetooptical ef fects of band electrons and of impurities. additional questions involved the impression of defects, resembling dislocations, on delivery homes and, ultimately, a concluding description of lattice dynamics of trigonal Se and Te, in response to theoretical and experimental paintings, similar to neutron diffraction and optical measurements. along with the directory of this destiny examine software it turned visible that extra unique paintings at the amorphous country of solids and drinks was once important with a purpose to enhance our wisdom approximately their crystalline right ties, becoming stipulations. and all difficulties of chemical bonds.
Read Online or Download The Physics of Selenium and Tellurium: Proceedings of the International Conference on the Physics of Selenium and Tellurium, Königstein, Fed. Rep. of Germany, May 28–31, 1979 PDF
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Additional resources for The Physics of Selenium and Tellurium: Proceedings of the International Conference on the Physics of Selenium and Tellurium, Königstein, Fed. Rep. of Germany, May 28–31, 1979
Sample text
O. 83 calculations with particular emphasis on the study of these modes can be summarized as follows [14,15]: i) Noncentral directed bonding interactions between the chains are vital for the stability of the trigonal chain crystal. They lift the lower B2 (K ) mode unstable in earlier VFF'S [13]. , kr/k R , k q, /k e etc. in Table 1. iii) Increase of the central three-body interactions krr' and krR in respect to their noncentral counterparts kq, and ke when going from Se to Te indicates a transition of covalent to me tal -1 ike bonding.
Kaind1, and B. Perscheid Institut fUr Atom- und Festkorperphysik, Freie Universitat Berlin 0-1000 Berlin 33, Fed. Rep. of Germany It has been known for many years that trigonal Te undergoes a transition to a metallic phase at a pressure of about 40 kbar at room temperature [1-3J. The structure of this high-pressure phase, however, has been controversial [4,5J, with proposals ranging from rhombohedral to simple cubic structures. 5-keY gamma resonance of 12STe were interpreted in support of a cubic structure for the high-pressure phase [6J.
Stubb 1 ,3 lElectron Physics Laboratory and 2Department of General Sciences, Helsinki University of Technology SF-02150 Espoo 15, Finland 3Sem iconductor Laboratory, Technical Research Centre of Finland SF-02150 Espoo 15, Finland 4NORDITA, DK-2100 Copenhagen 0, Denmark The purpose of the present paper is to report our non-relativistic Xa calculations of trigonal Te. In the self-consistent (SC) symmetrized OPW (SOPW) method used [1] both the valence states represented by SOPWs and the core states are included in the SC iteration.