Heat capacity, thermal conductivity, and thermal expansion of barium titanate-based ceramics

2004 ◽  
Vol 419 (1-2) ◽  
pp. 135-141 ◽  
Author(s):  
Yi He
Keyword(s):  
Thermal Conductivity ◽  
Heat Capacity ◽  
Thermal Expansion ◽  
Barium Titanate

scholarly journals Mechanical, Hygric and Thermal Properties of Flue Gas Desulfurization Gypsum

10.14311/626 ◽  
2004 ◽  
Vol 44 (5-6) ◽  
Author(s):  
P. Tesárek ◽  
J. Drchalová ◽  
J. Kolísko ◽  
P. Rovnaníková ◽  
R. Černý
Keyword(s):  
Thermal Conductivity ◽  
Heat Capacity ◽  
Thermal Expansion ◽  
Flue Gas ◽  
Linear Thermal Expansion Coefficient ◽  
Linear Thermal Expansion ◽  
Moisture Diffusivity ◽  
Flue Gas Desulfurization ◽  
Volumetric Heat Capacity ◽  
Reference Measurements

The reference measurements of basic mechanical, thermal and hygric parameters of hardened flue gas desulfurization gypsum are carried out. Moisture diffusivity, water vapor diffusion coefficient, thermal conductivity, volumetric heat capacity and linear thermal expansion coefficient are determined with the primary aim of comparison with data obtained for various types of modified gypsum in the future. 

Structural and thermal properties of the monoclinic Lu2SiO5single crystal: evaluation as a new laser matrix

2009 ◽  
Vol 42 (2) ◽  
pp. 284-294 ◽  
Author(s):  
Hengjiang Cong ◽  
Huaijin Zhang ◽  
Jiyang Wang ◽  
Wentao Yu ◽  
Jiandong Fan ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Thermal Conductivity ◽  
Heat Capacity ◽  
Thermal Expansion ◽  
Thermal Properties ◽  
Specific Heat ◽  
Linear Thermal Expansion ◽  
Cell Parameters ◽  
Thermal Expansion Tensor ◽  
Anisotropic Thermal Conductivity

The crystal structure of monoclinic Lu2SiO5(LSO) crystals, grown by the Czochralski method, was determined at room temperature by X-ray diffraction. The unit-cell parameters area= 10.2550 (2),b= 6.6465 (2),c= 12.3626 (4) Å, β = 102.422 (1)° in space groupI2/a. The linear thermal expansion tensor was determined along thea,b,candc* directions over the temperature range from 303.15 to 768.15 K, and the principal coefficients of the thermal expansion tensor are found to be αI= −1.0235 × 10−6 K, αII= 4.9119 × 10−6 K and αIII= 10.1105 × 10−6 K. The temperature dependence of the cell volume and monoclinic angle were also evaluated. In addition, the specific heat and the thermal diffusivity were measured over the temperature ranges from 293.15 to 673.15 K and from 303.15 to 572.45 K, respectively. As a result, the anisotropic thermal conductivity could be calculated and is reported for the first time, to the best of the authors' knowledge. The specific heat capacity of LSO is 139.54 J mol−1 K−1, and the principal components of the thermal conductivity arekI= 2.26 W m−1 K−1,kII= 3.14 W m−1 K−1andkII= 3.67 W m−1 K−1at 303.15 K. A new structure model was proposed to better understand the relationships between the crystal structure and anisotropic thermal properties. In comparison with other laser matrix crystals, it is found that LSO possesses relatively large anisotropic thermal properties, and owing to its small heat capacity it has a moderate thermal conductivity, which is similar to those of the tungstates but lower than those of the vanadates.

ISOBARIC THERMAL CONDUCTIVITY IN ORIENTATIONALLY DISORDERED PHASES OF SIMPLE MOLECULAR CRYSTALS

2010 ◽  
Vol 24 (29) ◽  
pp. 5821-5832 ◽  
Author(s):  
O. I. PURSKY ◽  
V. A. KONSTANTINOV
Keyword(s):  
Thermal Conductivity ◽  
Heat Capacity ◽  
Thermal Expansion ◽  
Thermal Resistance ◽  
Molecular Crystals ◽  
Total Thermal Resistance ◽  
Conductivity Model ◽  
Thermal Conductivity Model ◽  
Temperature Dependences ◽  
Diffusive Modes

The isobaric thermal conductivity of solid β- SF 6, CCl 4 (Ib) , and C 6 H 6 is investigated by using the Debye thermal conductivity model and taking into account the effect of minimum thermal conductivity. The simulation was carried out in the framework of a model where heat is transferred by phonons and "diffusive" modes with regard to the thermal expansion and phonon–rotation coupling. For this purpose the temperature dependences of the isobaric heat capacity components have been calculated numerically for β- SF 6, CCl 4 (Ib) , and C 6 H 6. The contributions of phonon–phonon and phonon–rotational interactions to the total thermal resistance are discussed.

scholarly journals Thermo-Physical Properties of HR3C and P92 Steels at High-Temperature

2019 ◽  
Vol 8 (2) ◽  
pp. 59-64
Author(s):  
Germain Boissonnet ◽  
Gilles Bonnet ◽  
Fernando Pedraza
Keyword(s):  
Thermal Conductivity ◽  
Heat Capacity ◽  
Thermal Expansion ◽  
Thermal Diffusivity ◽  
Power Plants ◽  
Ferromagnetic Transition ◽  
Steam Power ◽  
P92 Steel ◽  
Steam Power Plants ◽  
Thermo Physical Properties

Austenitic HR3C and ferritic-martensitic P92 steels are the materials of interest from a mechanical standpoint for the manufacturing of thermal exchangers of the next generation of steam power plants. In order to evaluate their capacity to transfer heat, thermal conductivity calculations have been conducted through the measurements of thermal diffusivity, specific heat capacity and density. It will be shown that the heat capacity, density, thermal expansion coefficient and thermal diffusivity evolve continuously with temperature in the HR3C material but not in the P92 steel. The heterogeneous thermal behaviour appears to be associated with its ferromagnetic transition rather than to the microstructural evolution. Nevertheless, the results for both steels did not exhibit significant differences between thermal conductivities at the intended temperature of service.

scholarly journals Thermal Expansion, Heat Capacity, and Thermal Conductivity of Nickel Ferrite (NiFe2 O4 )

2014 ◽  
Vol 97 (5) ◽  
pp. 1559-1565 ◽  
Author(s):  
Andrew T. Nelson ◽  
Joshua T. White ◽  
David A. Andersson ◽  
Jeffery A. Aguiar ◽  
Kenneth J. McClellan ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Heat Capacity ◽  
Thermal Expansion ◽  
Nickel Ferrite

Modeling and Simulation of Thermophysical Properties of Minor Actinides-Containing Oxide Fuels

2007 ◽  
Vol 1043 ◽  
Author(s):  
Masahito Katayama ◽  
Jun Adachi ◽  
Ken Kurosaki ◽  
Masayoshi Uno ◽  
Shuhei Miwa ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Molecular Dynamics ◽  
Heat Capacity ◽  
Thermal Expansion ◽  
Thermal Properties ◽  
Mixed Oxide ◽  
Perfect Crystal ◽  
Minor Actinide ◽  
Minor Actinides ◽  
Mox Fuel

AbstractThe molecular dynamics (MD) calculation was performed for minor actinide (MA: Np and Am)-containing mixed oxide (MOX) fuels, U0.7-xPu0.3MAxO2, in the temperature range from 300 to around 2500 K to evaluate the thermal expansion, heat capacity, and thermal conductivity. The MD results showed that the calculated heat capacity and thermal conductivity were similar in all the composition ranges, indicating that MA scarcely affected the thermal properties of the MOX fuel in the perfect crystal system.

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