Download or read book Infrared Spectra of Inorganic Dielectric Solids written by Johannes N. Plendl and published by . This book was released on 1964 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: The lattice vibration spectrum of a solid has recently been characterized by one single frequency, which is defined as the frequency of the center of gravity of the spectrum, called 'centro-frequency.' Here the experimental determination of this frequency is shown in detail for a number of solids, the vibrational spectra of which became available recently. Emphasis is given to spectral data at various temperatures, from 4K to about 1000K, and at the various major crystallographic directions. The 'centro-frequencies' at room temperature and higher temperatures show almost no change; whereas, at low temperature the 'centrofrequencies' consistently show a very definite increase. The result reveals a definite increase in binding energy with temperature decrease. A considerably higher resolution, particularly in the broad band areas, was obtained with spectra at very low temperatures. (Author).