TEMPERATURE DEPENDENCE OF THERMODYNAMIC PROPERTIES OF IONIC SOLIDS

2009 ◽  
Vol 23 (11) ◽  
pp. 2503-2509 ◽  
Author(s):  
S. K. SHARMA
Keyword(s):  
Experimental Data ◽  
Temperature Dependence ◽  
Volume Expansion ◽  
Close Agreement ◽  
Present Model ◽  
Expansion Ratio ◽  
Thermal Expansivity ◽  
Temperature Derivative ◽  
Computing Model ◽  
Ionic Solids

The present paper proposes a computing model for temperature dependence of volume thermal expansivity, volume expansion ratio and second order temperature derivative of volume based on the assumption that the product αKT remains constant at high temperatures and zero pressure. We have taken NaCl and KCl to testify the validity of the present model. A fairly close agreement between the calculated results and experimental data strongly supports the present model.

scholarly journals Study of Elastic Properties of Ionic Solids at High Temperature and Volume Expansion Ratio

2021 ◽  
pp. 232-236
Author(s):  
Sanjay Singh
Keyword(s):  
High Temperature ◽  
Elastic Property ◽  
Temperature Dependence ◽  
Atmospheric Pressure ◽  
Present Method ◽  
Volume Expansion ◽  
Expansion Ratio ◽  
Effect Of Temperature ◽  
Thermal Pressure ◽  
Ionic Solids

In our study we develop a new expression for temperature dependence of thermal pressure for MgO and CaO crystal. A generally elastic property of solid depends on the strength of inter atomic forces of solid. So far our work has been resolute on thermal pressure is dependent of temperature and diverges it’s linearly in high temperature volume expansion ratio through the effect of temperature. This present method has been developed on the temperature dependence of thermal pressure for MgO and CaO crystal at atmospheric pressure and volume expansion ratio at high temperature. A neighboring data of Gruneisen parameter is found to be in close convention with theoretical and investigational confirmations the standing of present study.

scholarly journals Temperature Dependence of Thermoelastic Properties for NaCl Crystal

2014 ◽  
Vol 2014 ◽  
pp. 1-3
Author(s):  
Kuldeep Kholiya ◽  
Jeewan Chandra
Keyword(s):  
Experimental Data ◽  
Thermal Expansion ◽  
Bulk Modulus ◽  
Volume Expansion ◽  
Close Agreement ◽  
Present Model ◽  
Harmonic Approximation ◽  
Temperature Dependent ◽  
Thermoelastic Properties ◽  
Experimental Values

Recently developed isothermal Kholiya’s EOS is modified to study the temperature dependent volume expansion and applied for NaCl crystal. The results obtained with the present model are in quite close agreement to the experimental values. The model is therefore extended to study the variation of bulk modulus and the coefficient of volume thermal expansion with temperature. Comparison of the obtained results with the experimental data demonstrates that an isothermal EOS may also be modified to study the temperature dependent elastic properties. The present study also reveals that the quasi harmonic approximation, that is, the product of bulk modulus and the coefficient of volume thermal expansion as constant, is valid in case of NaCl crystal.

scholarly journals Analysis of Thermodynamic and Volume Expansion Properties of Nacl Solid at High Temperatures and Pressures

2020 ◽  
pp. 178-181
Author(s):  
S Singh ◽  
P. K. Singh ◽  
S. K. Pathak
Keyword(s):  
High Temperature ◽  
Elastic Property ◽  
Temperature Dependence ◽  
High Temperatures ◽  
Atmospheric Pressure ◽  
Volume Expansion ◽  
Close Agreement ◽  
Expansion Ratio ◽  
Effect Of Temperature ◽  
Thermal Pressure

In the present study, we derived new relationship and expression for temperature dependence of thermal pressure for NaCl crystal. A mostly elastic property of solid depends on the strength of inter atomic forces of solids. The present work approach has been developed on the temperature dependence of thermal pressure for NaCl crystal at atmospheric pressure and volume expansion ratio at high temperature. So far our work has been concerted on thermal pressure is dependent of temperature and diverges it’s linearly in high temperature volume expansion ratio through effect of temperature. A close data and Gruneisen parameter is found to be in close agreement with investigational and theoretical shows the standing of present study.

scholarly journals Syntactic Foams Consolidated with Starch: Modelling for Pre-Mould Processing

2007 ◽  
Vol 29-30 ◽  
pp. 165-168
Author(s):  
M.M. Islam ◽  
Ho Sung Kim
Keyword(s):  
Experimental Data ◽  
Volume Expansion ◽  
Statistical Data ◽  
Expansion Ratio ◽  
Unit Cell ◽  
Syntactic Foams ◽  
Cell Models ◽  
Microsphere Size ◽  
Manufacturing Parameters ◽  
Good Agreement

Various manufacturing parameters involved in the ‘buoyancy method’ were inter-related. An equation based on unit cell models for a relation between volume expansion ratio (VER) of bulk microspheres in aqueous starch and microsphere size was derived. A good agreement between the equation and experimental data was found. The inter-microsphere distance (MID) concept was introduced and it was demonstrated that the MID can be calculated numerically for microspheres with known statistical data.

TUNNELLING MEASUREMENTS IN THE Bi SUPERCONDUCTORS

1989 ◽  
Vol 03 (01) ◽  
pp. 73-78 ◽  
Author(s):  
R. ESCUDERO ◽  
F. MORALES ◽  
F. ESTRADA ◽  
R. BARRIO
Keyword(s):  
Experimental Data ◽  
Temperature Dependence ◽  
Close Agreement

Tunnelling experiments made on a crack junction of Bi 2( Sr 0.56 Ca 0.39 Bi 0.05)3 Cu 2 O y show reproducible features in the I-V characteristic. Accurate measurements of the temperature dependence of these features show close agreement with the BCS behavior of the gap. Possible tunnelling processes in this material are discussed in connection with the experimental data.

CALCULATION OF VOLUME AS FUNCTIONS OF TEMPERATURE AND PRESSURE IN ICE I CLOSE TO THE MELTING POINT

2010 ◽  
Vol 24 (19) ◽  
pp. 3749-3758
Author(s):  
E. KILIT ◽  
H. YURTSEVEN
Keyword(s):  
Experimental Data ◽  
Melting Point ◽  
Temperature Dependence ◽  
Pressure Dependence ◽  
Critical Behavior ◽  
Isothermal Compressibility ◽  
Thermal Expansivity ◽  
Experimental Measurements ◽  
Approximate Relation ◽  
Temperature And Pressure

We calculate in this study the volume of ice I as functions of temperature and pressure close to the melting point by analyzing the experimental data for the thermal expansivity. Using an approximate relation, the temperature dependence of the volume is calculated at 202.4 MPa from the thermal expansivity of ice I. The pressure dependence of the volume is also calculated at 252.3 K from the isothermal compressibility of ice I close to the melting point. The volume calculated here as functions of temperature and pressure shows critical behavior close to the melting point in ice I, which can be tested by the experimental measurements.

TEMPERATURE DEPENDENCE BEHAVIOR OF ELECTRICAL RESISTIVITY IN NOBLE METALS AT LOW TEMPERATURES

2014 ◽  
Vol 5 (3) ◽  
pp. 982-992 ◽  
Author(s):  
M AL-Jalali
Keyword(s):  
Experimental Data ◽  
Electrical Resistivity ◽  
Temperature Dependence ◽  
Concentration Dependence ◽  
Low Temperatures ◽  
Noble Metals ◽  
Phonon Scattering ◽  
Theoretical Models ◽  
Residual Resistivity ◽  
Electron Phonon Scattering

Resistivity temperature – dependence and residual resistivity concentration-dependence in pure noble metals(Cu, Ag, Au) have been studied at low temperatures. Dominations of electron – dislocation and impurity, electron-electron, and electron-phonon scattering were analyzed, contribution of these mechanisms to resistivity were discussed, taking into consideration existing theoretical models and available experimental data, where some new results and ideas were investigated.

scholarly journals Ability of Constitutive Models to Characterize the Temperature Dependence of Rubber Hyperelasticity and to Predict the Stress-Strain Behavior of Filled Rubber under Different Defor Mation States

Polymers ◽  
2021 ◽  
Vol 13 (3) ◽  
pp. 369
Author(s):  
Xintao Fu ◽  
Zepeng Wang ◽  
Lianxiang Ma
Keyword(s):  
Experimental Data ◽  
Temperature Dependence ◽  
Mechanical Response ◽  
Constitutive Models ◽  
Uniaxial Tensile ◽  
Uniaxial Tensile Test ◽  
Chain Model ◽  
Stress Strain ◽  
Filled Rubber ◽  
Yeoh Model

In this paper, some representative hyperelastic constitutive models of rubber materials were reviewed from the perspectives of molecular chain network statistical mechanics and continuum mechanics. Based on the advantages of existing models, an improved constitutive model was developed, and the stress–strain relationship was derived. Uniaxial tensile tests were performed on two types of filled tire compounds at different temperatures. The physical phenomena related to rubber deformation were analyzed, and the temperature dependence of the mechanical behavior of filled rubber in a larger deformation range (150% strain) was revealed from multiple angles. Based on the experimental data, the ability of several models to describe the stress–strain mechanical response of carbon black filled compound was studied, and the application limitations of some constitutive models were revealed. Combined with the experimental data, the ability of Yeoh model, Ogden model (n = 3), and improved eight-chain model to characterize the temperature dependence was studied, and the laws of temperature dependence of their parameters were revealed. By fitting the uniaxial tensile test data and comparing it with the Yeoh model, the improved eight-chain model was proved to have a better ability to predict the hyperelastic behavior of rubber materials under different deformation states. Finally, the improved eight-chain model was successfully applied to finite element analysis (FEA) and compared with the experimental data. It was found that the improved eight-chain model can accurately describe the stress–strain characteristics of filled rubber.

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