. The Bell System technical journal . every high melting point metals—columbium, molybdenum, tantalum,and tungsten—come approximately at the middle of their transitionseries. In Table II we give the binding energies for a number of thetransition elements. 15 F. Seitz and R. P. Johnson, Jour. App. Phys., 8, 84, 186, 246 (1937). 684 BELL SYSTEM TECHNICAL JOURNAL TABLE II Heats of Sublimation for Several Metals Including the Transition ElementsIN Kilocalories per Gram Atom * Ca 48 Se70 Ti100 V85 Cr 88 Mn 74 Fe94 NI85 Cu 81 Zn Sr47 Y 90 Z 110 Cb Mo160 Ma Ru 120 Rh115 Pd110
. The Bell System technical journal . every high melting point metals—columbium, molybdenum, tantalum,and tungsten—come approximately at the middle of their transitionseries. In Table II we give the binding energies for a number of thetransition elements. 15 F. Seitz and R. P. Johnson, Jour. App. Phys., 8, 84, 186, 246 (1937). 684 BELL SYSTEM TECHNICAL JOURNAL TABLE II Heats of Sublimation for Several Metals Including the Transition ElementsIN Kilocalories per Gram Atom * Ca 48 Se70 Ti100 V85 Cr 88 Mn 74 Fe94 NI85 Cu 81 Zn Sr47 Y 90 Z 110 Cb Mo160 Ma Ru 120 Rh115 Pd110 Ag68 Cs Ba49 La90 Hf T 185 W210 Re Os 125 Ir120 Pt 127 Au92 * Taken from F. R. Bichowsky and F. D. Rossini The Thermochemistry of theChemical Substances, Reinhold (1936), except for T which was taken from D. and L. Maker, Phys. Rev. 55, 1138 (1939). Energy Bands of DiamondIn Fig. 17 we show the band structure for diamond as calculated byKimball.^^ The configuration of the carbon atom is Is^ls^lp^ and. ao 5 6 7 8 9 10 II 12 LATTICE CONSTANT IN ANGSTROMS Fig. 17—Energy bands for diamond versus lattice constant. all four of the L shell electrons are involved in the binding. At largelattice constants the lower band contains two states per atom and theupper six. The lower band is completely filled, the upper only one- 1® G. E. Kimball, Jour. Chem. Phys., 3, 560 (1935). Some unimportant featuresresulting from approximations in Kimballs work have been modified in this figure. THE QUANTUM PHYSICS OF SOLIDS 685 third filled. To the left of the crossing of the bands, Kimball findsthat both bands contain four states per atom so that the lower is filledand the upper is empty. The actual spacing in diamond occurs tothe left of the crossover and, as we shall see in the next paper, theresultant filled band and empty band arrangement explains the ab-sence of electrical conductivity for diamond. The diagram suggestsan explanation for the conductivity in grap
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