scholarly journals Thermal expansion properties of organic crystals: a CSD study

2021 ◽  
Author(s):  
Arie van der Lee ◽  
Dan George Dumitrescu
Keyword(s):  
Data Mining ◽  
Thermal Expansion ◽  
Thermal Expansion Coefficient ◽  
Organic Compounds ◽  
Expansion Coefficient ◽  
Organic Crystals ◽  
Volumetric Thermal Expansion ◽  
Volumetric Thermal Expansion Coefficient ◽  
Structural Database ◽  
The Mean

Abstract The thermal expansion properties of crystalline organic compounds are investigated by data mining of the Cambridge Structural Database (CSD). The mean volumetric thermal expansion coefficient is 168.8 10-6K-1 and...

Effect of Ta Addition on Properties and Microstructures of Fe-28Ni-11.5Al Shape Memory Alloys

2014 ◽  
Vol 787 ◽  
pp. 288-294 ◽  
Author(s):  
Wen Yi Peng ◽  
Neng Wu Yang ◽  
Gui Li Qu ◽  
Wei Wei Wang ◽  
Hai Ping Shi ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Thermal Expansion ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Thermal Expansion Coefficient ◽  
Expansion Coefficient ◽  
Test Machine ◽  
X Ray Diffraction ◽  
Recoverable Strain ◽  
The Mean

The effects of Ta additions (x=0, 0.5, 1.0, 1.5) in Fe60.5-xNi28Al11.5Tax(at.%) shape memory alloys on microstructure, thermal expansion, and pseudoelasticity of the aged alloys were investigated by metallurgical microscope, X-ray diffraction, SEM, EDS, high-temperature dilatometer spectrometer and pressure test machine. The results showed that with the increment of Ta additions, the γ' phase content increased which strengthened the austenitic matrix, meanwhile the compressive strength, the recoverable strain and the maximum strain of the aging state alloys decreased first and then increased, and the alloy’s residual strain firstly decreased and then increased. When the Ta content was 1.0 at.%, the alloy’s compressive strength, recoverable strain and plastic deformation strain reached its maximum value, 2.5Gpa, 14.4%, and 16.0% respectively. Thus, the alloy had the best pseudo-elastic at this time. The mean thermal expansion coefficient of the alloys decreased with Ta additions, when the Ta content was 1.0 at.%, the mean thermal expansion coefficient was at its minimum.

Thermal Expansion of Silver Iodide

1973 ◽  
Vol 28 (9) ◽  
pp. 1539-1541 ◽  
Author(s):  
Bert Jansson ◽  
Carl-Axel Sjöblom
Keyword(s):  
Thermal Expansion ◽  
Thermal Expansion Coefficient ◽  
Expansion Coefficient ◽  
Silver Iodide ◽  
Linear Thermal Expansion Coefficient ◽  
Linear Thermal Expansion ◽  
Thermal Expansivity ◽  
Fused Quartz ◽  
The Mean ◽  
Polycrystalline Silver

The linear thermal expansivity of polycrystalline silver iodide has been measured with a "Fused-Quartz Tube" apparatus in the temperature range 170 - 500 °C, the mean linear thermal expansion coefficient beingαt180=(2.607 + 0.00182 t) 10-5 (°C-1).An irregular change in the thermal expansivity was found close to 432 °C where an order-disorder transition has been reported.

scholarly journals First-principles investigation of mechanical and thermodynamic properties of nickel silicides at finite temperature -=SUP=-*-=/SUP=-

2018 ◽  
Vol 60 (5) ◽  
pp. 964
Author(s):  
Zhiqin Wen ◽  
Yuhong Zhao ◽  
Hua Hou ◽  
Liwen Chen
Keyword(s):  
Heat Capacity ◽  
Thermal Expansion ◽  
High Temperature ◽  
Thermodynamic Properties ◽  
Thermal Expansion Coefficient ◽  
Debye Temperature ◽  
Expansion Coefficient ◽  
Finite Temperature ◽  
Volumetric Thermal Expansion Coefficient ◽  
Nickel Silicides

AbstractFirst-principles calculations are performed to investigate lattice parameters, elastic constants and 3D directional Young’s modulus E of nickel silicides (i.e., β-Ni_3Si, δ-Ni_2Si, θ-Ni_2Si, ε-NiSi, and θ-Ni_2Si), and thermodynamic properties, such as the Debye temperature, heat capacity, volumetric thermal expansion coefficient, at finite temperature are also explored in combination with the quasi-harmonic Debye model. The calculated results are in a good agreement with available experimental and theoretical values. The five compounds demonstrate elastic anisotropy. The dependence on the direction of stiffness is the greatest for δ-Ni_2Si and θ-Ni_2Si, when the stress is applied, while that for β-Ni_3Si is minimal. The bulk modulus B reduces with increasing temperature, implying that the resistance to volume deformation will weaken with temperature, and the capacity gradually descend for the compound sequence of β-Ni_3Si > δ-Ni_2Si > θ-Ni_2Si > ε-NiSi > θ-Ni_2Si. The temperature dependence of the Debye temperature ΘD is related to the change of lattice parameters, and ΘD gradually decreases for the compound sequence of ε-NiSi > β-Ni_3Si > δ-Ni_2Si > θ-Ni_2Si > θ-Ni_2Si. The volumetric thermal expansion coefficient αV, isochoric heat capacity and isobaric heat capacity C _ p of nickel silicides are proportional to T ^3 at low temperature, subsequently, αV and C _ p show modest linear change at high temperature, whereas C _v obeys the Dulong-Petit limit. In addition, β-Ni_3Si has the largest capability to store or release heat at high temperature. From the perspective of solid state physics, the thermodynamic properties at finite temperature can be used to guide further experimental works and design of novel nickel–silicon alloys.

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