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Title: Thermophysical properties and conduction mechanisms in As xSe 1-x chalcogenide glasses ranging from x = 0.2 to 0.5

The arsenic (As) to selenium (Se) ratio in As xSe 1-x glasses ranging from x = 0.2 to 0.5 was varied in order to examine the effect of chemical and topological ordering on the glass' thermal transport behavior. The fundamental thermal properties of glass transition temperature (T g), thermal conductivity (k), and heat capacity (c p) were experimentally measured using differential scanning calorimetry, transient plane source method, and ultrasonic testing. Based on topological constraint theory, inflections in T g and k were found at the structural coordination number $$\langle$$r$$\rangle$$ of 2.4, whereas a slight increase in heat capacity (c p) with increasing $$\langle$$r$$\rangle$$ was observed. A maximum in total thermal conductivity of 0.232 W/m·K was measured for the composition with x = 0.4, which corresponds to the stoichiometric As 2Se 3. Gas kinetic theory was used to derive an expression for the photon (k p) portion of thermal conductivity, which was calculated by measurements of the glass' absorption coefficient (α) and refractive index (n). Models based on Debye theory were then used to derive expressions for specific heat (c v) and the lattice (k l) portion of thermal conductivity. The maximum value for k p was 0.173 W/m·K for the composition with x = 0.2, and a minimum value of 0.144 W/m·K was measured for the composition with x = 0.4. Photonic conduction was found to be the dominant carrier mechanisms in all compositions, comprising 60% to 95% of the measured total thermal conductivity.
Authors:
 [1] ;  [1] ; ORCiD logo [1] ;  [1]
  1. Univ. of Central Florida, Orlando, FL (United States). The College of Optics and Photonics (CREOL)
Publication Date:
Grant/Contract Number:
EE0005327; HDTRA1-13-1-0001; NA000278
Type:
Accepted Manuscript
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 120; Journal Issue: 14; Journal ID: ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)
Research Org:
Univ. of Central Florida, Orlando, FL (United States)
Sponsoring Org:
USDOE; Defense Threat Reduction Agency (DTRA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; phonons; photons; thermal conduction; heat capacity; glasses; thermal conductivity; glass transitions; absorption coefficient; refractive index
OSTI Identifier:
1465114
Alternate Identifier(s):
OSTI ID: 1328596

Lonergan, Jason, Smith, Charmayne, McClane, Devon, and Richardson, Kathleen. Thermophysical properties and conduction mechanisms in AsxSe1-x chalcogenide glasses ranging from x = 0.2 to 0.5. United States: N. p., Web. doi:10.1063/1.4962446.
Lonergan, Jason, Smith, Charmayne, McClane, Devon, & Richardson, Kathleen. Thermophysical properties and conduction mechanisms in AsxSe1-x chalcogenide glasses ranging from x = 0.2 to 0.5. United States. doi:10.1063/1.4962446.
Lonergan, Jason, Smith, Charmayne, McClane, Devon, and Richardson, Kathleen. 2016. "Thermophysical properties and conduction mechanisms in AsxSe1-x chalcogenide glasses ranging from x = 0.2 to 0.5". United States. doi:10.1063/1.4962446. https://www.osti.gov/servlets/purl/1465114.
@article{osti_1465114,
title = {Thermophysical properties and conduction mechanisms in AsxSe1-x chalcogenide glasses ranging from x = 0.2 to 0.5},
author = {Lonergan, Jason and Smith, Charmayne and McClane, Devon and Richardson, Kathleen},
abstractNote = {The arsenic (As) to selenium (Se) ratio in AsxSe1-x glasses ranging from x = 0.2 to 0.5 was varied in order to examine the effect of chemical and topological ordering on the glass' thermal transport behavior. The fundamental thermal properties of glass transition temperature (Tg), thermal conductivity (k), and heat capacity (cp) were experimentally measured using differential scanning calorimetry, transient plane source method, and ultrasonic testing. Based on topological constraint theory, inflections in Tg and k were found at the structural coordination number $\langle$r$\rangle$ of 2.4, whereas a slight increase in heat capacity (cp) with increasing $\langle$r$\rangle$ was observed. A maximum in total thermal conductivity of 0.232 W/m·K was measured for the composition with x = 0.4, which corresponds to the stoichiometric As2Se3. Gas kinetic theory was used to derive an expression for the photon (kp) portion of thermal conductivity, which was calculated by measurements of the glass' absorption coefficient (α) and refractive index (n). Models based on Debye theory were then used to derive expressions for specific heat (cv) and the lattice (kl) portion of thermal conductivity. The maximum value for kp was 0.173 W/m·K for the composition with x = 0.2, and a minimum value of 0.144 W/m·K was measured for the composition with x = 0.4. Photonic conduction was found to be the dominant carrier mechanisms in all compositions, comprising 60% to 95% of the measured total thermal conductivity.},
doi = {10.1063/1.4962446},
journal = {Journal of Applied Physics},
number = 14,
volume = 120,
place = {United States},
year = {2016},
month = {10}
}