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),
Abstract
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 = 1/Nn, 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 (1/Nn) 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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 12, 1967
- Accession Number
- AD0672340
Entities
People
- G. V. Samsonov
Organizations
- National Air and Space Intelligence Center