AN INVESTIGATION OF THE PHYSIOCHEMICAL NATURE OF METAL-LIKE AND NONMETALLIC HIGH-MELTING COMPOUNDS BY THE MICROHARDNESS METHOD (ISSLEDOVANIE FIZIKOKHIMICHESKOI PRIRODY METALLOPODOVNYKH I NEMETALLICHESKIKH TUGOPLAVKIKH SOEDINENII METODOM MIKROTVERDOSTI),
FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO
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This review of microhardness is concerned with metalloid and nonmetallic refractory compounds. The author attempts to show that microhardness depends mainly on two factors electron density and crystal structure. The microhardness of a number of transition metals, carbides, nitrides, borides, and silicides is compared in terms of the electron-accepting ability of the d-orbitals 1Nn, where n is the number of electrons in the incompleted d-orbital and N the principal quantum number of the d-orbital. It is noted that microhardness increases with increase in 1Nn and with the degree of symmetry of the electron distribution. For nonmetallic compounds, the microhardness depends on the nature of the p-function and decreases with increase in the principal quantum number of the p-electrons.
- Ceramics, Refractories and Glass
- Atomic and Molecular Physics and Spectroscopy