Properties of Compressed Atoms from a Spherical Cellular Model
When pressure is applied to matter the volume per atom will decrease and, as conjectured by P.W. Bridgman long ago, changes will occur in the electron structure and hence in several solid-state properties. Static and in particular dynamic high pressure experiments on the pure elements /1–6/ have revealed that solid-solid transitions are not exceptional and that several properties e.g. compressibilities, electrical conductivity and melting temperatures do not change with pressure in a simple and regular fashion. The prime examples of this are perhaps the transitions in Ce /7/ and Cs /8,9/ at 7 kbar and 42 kbar respectively where a large discontinuous decrease of the volume occurs without changes in the lattice structure. These transitions have been denoted electronic, a concept which Drickamer and Frank /2/ interpret as a pressure-induced shift to a new or greatly modified electronic ground state of a system.
KeywordsVolume Dependence Freeze Orbital Electronic Specific Heat Dynamic High Pressure Crystal Orbital
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