Accession Number : AD0764891

Title :   Pressure and Temperature Studies of Glass Properties Related to Vibrational Spectra.

Descriptive Note : Technical rept. no. 3, Feb 72-31 Jan 73,

Corporate Author : HAWAII INST OF GEOPHYSICS HONOLULU

Personal Author(s) : Manghnani,Murli H.

Report Date : JUL 1973

Pagination or Media Count : 35

Abstract : Infrared absorption spectra of five lithium silicate and six potassium silicate glasses of varying composition (20 to 25 mole % Li2O, and 15 to 40 mole % K2O, respectively) are examined in the range 1500 to 100/cm. The frequencies of the main absorption bands decrease with an increase of alkalimetal oxide (M2O) content, with the exception of the about 960/cm shoulder for the lithium silicate glasses. The pressure dependences to about 40 kbar, of all the main infrared absorption frequencies, which are pressure-sensitive, are found to be positive. The effects of pressure were found to be opposite to the compositional effects. Gruneisen mode gammas evaluated from the pressure dependence of the infrared absorption frequencies are apparently related to the polarizing power of the alkalimetal ion. The results are discussed in light of previous high-pressure infrared absorption studies of fused silica and sodium silicate glasses. (Modified author abstract)

Descriptors :   (*GLASS, *INFRARED SPECTRA), (*SILICATES, INFRARED SPECTRA), LITHIUM COMPOUNDS, HIGH PRESSURE, CHEMICAL BONDS, TEMPERATURE

Subject Categories : Ceramics, Refractories and Glass
      Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE