Abstract
The termophisical properties, namely, the temperature dependence of thermal conductivity, thermal resistance and heat capacity of the allays compositions (2Bi2O3∙B2O3)100-x (2Bi2O3∙3GeO2)x in the (300–600) K temperature range have ligated been invest. An increase in thermal conductivity χ(T) above 500 K is probably associated with the softening of alloys and the presence of blurred phase transitions, which are accompanied by partial breaking of chemical bonds. It was revealed that the heat capacity in alloys of the compositions (2Bi2O3∙B2O3)100-x (2Bi2O3∙3GeO2)x increases with an increase in the GeO2 concentration. In the studied samples, that showed their own disorder during solidification, the thermal conductivity is strongly reduced due to the enhancement of the anharmonicity of phonon – phonon interactions. İn turn a small "disorder" introduced by defects due to the difference in masses is not noticeable against the background of the huge "disorder" inherent in oxide substances
Highlights
Amorphous and glassy materials based on bismuth borates are being intensively studied [1,2,3,4,5,6]
In [13], the heat capacity, thermal conductivity, and thermal expansion of the Bi12SiO20 single crystals were studied in a wide temperature range, while the heat capacity of the GeO2–PbO oxide systems was considered by authors of [14]
The heat capacity of bismuth borate was investigated by the authors of [6, 15,16,17, 19, 20]
Summary
Amorphous and glassy materials based on bismuth borates are being intensively studied [1,2,3,4,5,6]. Glasses based on Bi2O3 have high refractive indices, a wide transparency region in the visible and IR ranges, and are promising materials for practical application [8, 9]. It was found [7] that bismuth borates can be used as a frequency converter of laser radiation based on stimulated Raman scattering. The present work aims to study the thermal conductivity, thermal resistance, and heat capacity of alloys of the 2Bi2O3∙B2O3 – 2 Bi2O3∙3GeO2 system in the 300–650 K temperature range
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
