Pressure and Temperature Studies of Glass Properties Related to Vibrational Spectra.
Abstract
This report concerns the M2O-SiO2 and SiO2-TiO2 glass systems. Elastic, thermal and infrared absorption characteristics of nineteen simple binary M2O-SiO2 glasses, where M is Li, Na or K, have been studied at ambient conditions as well as function of pressure and temperature. M2O content of these glasses ranges from 10 to 45 mole %. Elastic moduli were investigated to 5 kbar and to 300 C, thermal expansivity to 300 C, and infrared absorption to 58.8 kbar. The elastic properties of the M2O-SiO2 glasses vary systematically with composition. Addition of M2O to SiO2 structure causes increase in bulk modulus of all the glasses, decrease in shear and Young's moduli of all but the Li2O- SiO2 glasses, and increase in Poisson's ratio. Low M2O glasses show anomalous elastic behavior under pressure. Effect of phase separation on the elastic properties is not significant; however, their temperature dependence is sensitive to phase separation. Ultrasonic longitudinal and shear wave attenuation are found to be linearly proportional to frequency. The low- temperature attenuation peak found in fused silica at approximatley 47 K broadens and shifts to higher temperature with increase in M2O content.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1974
- Accession Number
- ADA016802
Entities
People
- Murli H. Manghnani