scholarly journals Anharmonic phonon quasiparticle theory of zero-point and thermal shifts in insulators: Heat capacity, bulk modulus, and thermal expansion

2015 ◽  
Vol 92 (6) ◽  
Author(s):  
Philip B. Allen
Keyword(s):  
Heat Capacity ◽  
Thermal Expansion ◽  
Bulk Modulus ◽  
Zero Point

scholarly journals Evaluation of Thermal-Mechanical Properties of Bio-Oil Regenerated Aged Asphalt

Materials ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 2224 ◽  
Author(s):  
Tianyuan Yang ◽  
Meizhu Chen ◽  
Xinxing Zhou ◽  
Jun Xie
Keyword(s):  
Heat Capacity ◽  
Thermal Expansion ◽  
Shear Modulus ◽  
Bulk Modulus ◽  
Specific Heat ◽  
Thermal Expansion Coefficient ◽  
Specific Heat Capacity ◽  
Expansion Coefficient ◽  
Bio Oil ◽  
Aged Asphalt

Different proportions of bio-oil (5, 10, 15, and 20 wt%) were added into aged asphalt for its regeneration. Molecular dynamic simulations were used to measure the thermal and mechanical performances of bio-oil regenerated aged asphalt (BRAA). A new, simplified BRAA model was built to calculate the specific heat capacity, thermal expansion coefficient, elastic constant, shear modulus, bulk modulus, and Young’s modulus. Simulation results showed that the thermal expansion coefficient (CTE α) of asphalt at 298 K decreased by 10% after aging. Bio-oil of 5 wt% could make the CTE α restore to the original level of base asphalt, while the addition of bio-oil would further decrease the specific heat capacity of aged asphalt. The shear modulus (G), Young’s modulus (K) and bulk modulus (E) of asphalt increased after aging and decreased with the increasing amount of bio-oil. According to the calculated E/G value, the ductility of aged asphalt increased by 6.0% with the addition of 10 wt% bio-oil, while over 15 wt% bio-oil would make the ductility of BRAA decrease. In summary, the regeneration effects of bio-oil to the thermal expansion coefficient, flexibility, and ductility of aged asphalt had been proven, while excessive bio-oil would decrease the thermal stability of asphalt.

Phonon and thermal expansion properties in Weyl semimetals MX (M = Nb, Ta; X = P, As): ab initio studies

2016 ◽  
Vol 18 (21) ◽  
pp. 14503-14508 ◽  
Author(s):  
Dahu Chang ◽  
Yaming Liu ◽  
Fengfei Rao ◽  
Fei Wang ◽  
Qiang Sun ◽  
...  
Keyword(s):  
Heat Capacity ◽  
Thermal Expansion ◽  
Bulk Modulus ◽  
Ab Initio ◽  
High Temperatures ◽  
Low Temperatures ◽  
Weyl Semimetals

Thermal expansion properties of Weyl semimetals MX are determined mainly by the isovolume heat capacity at low temperatures, whereas bulk modulus at high temperatures.

Thermal Properties of β-Ga2O3 from First Principles

MRS Advances ◽  
2016 ◽  
Vol 1 (2) ◽  
pp. 109-114 ◽  
Author(s):  
Marco D. Santia ◽  
Nandan Tandon ◽  
J. D. Albrecht
Keyword(s):  
Thermal Conductivity ◽  
Heat Capacity ◽  
Thermal Expansion ◽  
Bulk Modulus ◽  
Harmonic Approximation ◽  
Boltzmann Transport ◽  
Grüneisen Parameters ◽  
Optical Modes ◽  
Gruneisen Parameters

ABSTRACTThe thermal conductivity, bulk modulus, thermal expansion and heat capacity for bulk β-Ga2O3 are calculated from lattice dynamics using both a quasi-harmonic approximation and an anharmonic force-constant approach involving a solution of the linearized Boltzmann transport equation. The role of anharmonicity in β-Ga2O3 is determined to be small, which leads to the weak volume dependence of the calculated thermal conductivity. The negligible anharmonic contribution to the overall thermal conductivity is consistent with both thermal expansion measurements and also with comparisons between the quasi-harmonic and anharmonic methods. Phonon-mode-dependent Grüneisen parameters are found to be weakly dependent on temperature. Negative values of the mode Grüneisen parameters are found for certain low energy optical modes, but their net effect on the overall thermal expansion is insignificant. Bulk modulus as well as heat capacity are also given and found to be in agreement with experimental results.

Comparison of thermal expansion and heat capacity properties of various borosilicate glass-bonded strontium chloroapatite composites loaded with simulated pyrochemical waste

2014 ◽  
Vol 119 (3) ◽  
pp. 1825-1831 ◽  
Author(s):  
Binoy Kumar Maji ◽  
Hrudananda Jena ◽  
R. Venkata Krishnan ◽  
R. Asuvathraman ◽  
K. Ananthasivan ◽  
...  
Keyword(s):  
Heat Capacity ◽  
Thermal Expansion ◽  
Borosilicate Glass

Heat capacity and thermal expansion of the itinerant helimagnet MnSi

2008 ◽  
Vol 20 (23) ◽  
pp. 235222 ◽  
Author(s):  
S M Stishov ◽  
A E Petrova ◽  
S Khasanov ◽  
G Kh Panova ◽  
A A Shikov ◽  
...  
Keyword(s):  
Heat Capacity ◽  
Thermal Expansion

Heat Capacity and Thermal Expansion of M-Terbium Orthotantalate

2021 ◽  
Vol 499 (1) ◽  
pp. 70-72
Author(s):  
P. G. Gagarin ◽  
A. V. Guskov ◽  
V. N. Guskov ◽  
A. V. Khoroshilov ◽  
K. S. Gavrichev ◽  
...  
Keyword(s):  
Heat Capacity ◽  
Thermal Expansion

scholarly journals Thermal Properties of Stabilized Zirconia at Low Temperatures

1985 ◽  
Vol 38 (4) ◽  
pp. 617 ◽  
Author(s):  
JG Collins ◽  
SJ Collocott ◽  
GK White
Keyword(s):  
Heat Capacity ◽  
Thermal Expansion ◽  
Thermal Properties ◽  
Thermal Expansion Coefficient ◽  
Expansion Coefficient ◽  
Low Temperatures ◽  
Linear Thermal Expansion Coefficient ◽  
Linear Thermal Expansion ◽  
Stabilized Zirconia ◽  
Elastic Data

The linear thermal expansion coefficient a from 2 to 100 K and heat capacity per gram cp from 0�3 to 30 K are reported for fully-stabilized zirconia containing a nominal 16 wt.% (9 mol.%) of yttria. The heat capacity below 7 K has been analysed into a linear (tunnelling?) term, a Schottky term centred at 1�2 K, a Debye term (e~ = 540 K), and a small T5 contribution. The expansion coefficient is roughly proportional to T from 5 to 20 K and gives a limiting lattice Griineisen parameter 'Yo ::::: 5, which agrees with that calculated from elastic data.

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