Ionic crystals
Abstract
The theory of ionic crystals such as the alkali halides is discussed. The general topics include a discussion of: the local electric fields, multipole polarizability, core level spectra, and electron energy levels. A good theory of crystal structure, since microscopic forces are not well characterized, is still not available. One concludes that other quantities which depend upon forces, such as the elastic constants, are also not well understood, although theories of them are published all of the time. A good theory of bonding is also not available. Here there are two camps: one which regards the bonding as ionic, while the other advocates significant amounts of covalency. Recently it was shown that both the elastic constants, and the amount of covalent bonding, depend significantly upon the higher multipole polarizabilities.
- Publication:
-
Presented at the 2nd Petra School
- Pub Date:
- March 1985
- Bibcode:
- 1985pesc.rept.....M
- Keywords:
-
- Bonding;
- Crystal Structure;
- Elastic Properties;
- Ionic Crystals;
- Optical Properties;
- Photoelectric Emission;
- Solid State;
- Alkali Metal Compounds;
- Electric Fields;
- Electron Energy;
- Halides;
- Optical Polarization;
- Solid-State Physics