Specific heat ratio, Grüneisen parameter and Debye temperature of crude oil

Singh, Ranjit; George, A. K.; Arafin, Sayyadul

doi:10.1088/0022-3727/39/6/031

Cited by 17 publications

(14 citation statements)

References 12 publications

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“…The refractive index (n f ) and film density (ρ f ) are related to electronic polarizability (α e ) through the famous Lorentz-Lorenz relation (Singh et al, 2006;Hecht, 2012):…”

Section: Structure and Temperature Dependent Phase Transitionsmentioning

confidence: 99%

Thermo Optical Properties and Related Electronic Polarizabilities of MoO₃ Thin Films Using Ellipsometry

Hussain¹

2019

American Journal of Engineering and Applied Sciences

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Thermo optical properties are reported for thermally evaporated MoO 3 thin films using ellipsometry. The values of TOCs: dn/dT and dk/dT relating to MoO 3 thin films are found to be negative and positive, respectively over the temperature range 295-460 K and also are found to have the same trend over the range 120-300 K, and have values of the order of 10 −4 K −1 and 10 −5 K −1 , respectively in the visible part of spectral range. The values of electronic polarizability were determined to be in the range from 8.2 to 8.21×10 −24 cm 3 in the temperature range 120-460 K and over the same part of spectral range. Vacuum-heating and annealing in an oxygen plasma environment certainly assists in reducing a large amount of porosity in the films, but these series of actions yield irreversible changes in the morphology of the films. Once the films during oxidative-annealing turned into black in colour and new reduced chemical states were produced, then after that, original states of the films were very hard to restore. Ellipsometric data of MoO thin films at or above the room temperature in the range 295-460 K seems to be controlled by first-order kinetics and could be interpreted in terms of polaronic excitations and hoppings. During the in-situ cooling runs, the changes in the ellipsometric data are interpreted in terms of bipolaronic excitations, but the possibility of simultaneous presence of polaronic and bipolaronic states cannot be ignored over the investigated temperature range.

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“…The refractive index (n f ) and film density (ρ f ) are related to electronic polarizability (α e ) through the famous Lorentz-Lorenz relation (Singh et al, 2006;Hecht, 2012):…”

Section: Structure and Temperature Dependent Phase Transitionsmentioning

confidence: 99%

Thermo Optical Properties and Related Electronic Polarizabilities of MoO₃ Thin Films Using Ellipsometry

Hussain¹

2019

American Journal of Engineering and Applied Sciences

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“…The Debye temperature is an important parameter for characterizing the properties of crude oil [24]; see (10), above, where h is the Planck constant, k is the Boltzmann constant, γ is the specific heat ratio, N is Avogadro's number, and V is the molar volume. Fig.…”

Section: J Effective Debye Temperature θ Dmentioning

confidence: 99%

Ultrasonic evaluation of thermodynamic parameters of liquids under high pressure

Kiełczyński

Szalewski

Balcerzak

et al. 2015

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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In many technological processes (e.g., in the chemical, petrochemical, food, and plastics industries), liquids are subjected to high pressures and temperatures. Therefore, knowledge of their thermodynamic properties is essential for understanding, design, and control of the process technology. Direct evaluation of the thermodynamic parameters of liquids under high pressure, using conventional methods, is very difficult. Therefore, the application of these methods in industrial conditions, particularly in on-line control of the technological parameters of liquids, is practically impossible. Ultrasonic methods (e.g., sound speed measurements) are very suitable for this purpose because of their simplicity and accuracy. The sound velocity is closely related to numerous thermodynamic properties of liquids. The objective of this paper is to address the influence of temperature and pressure on the thermodynamic parameters of liquids, using the example of diacylglycerol (DAG) oil, employing ultrasonic methods. In this paper, we present ultrasonic velocity and density measurements (performed by the authors) in DAG oil over a range of pressures and temperatures. On the basis of experimental results (the sound velocity and liquid density versus pressure and temperature) a series of DAG oil thermodynamic parameters such as specific heat ratio, intermolecular free path length, Van der Waals constant b, surface tension, and effective Debye temperature were evaluated as functions of pressure and temperature.

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“…The value of ω S /ω S (5K) increases progressively as the temperature decreases down to T = 5 K. It is worth noting that ω S exhibits non-zero values even for temperatures T > T C , therefore, the existence of magnetic short-range ordering in the paramagnetic region can be invoked [20][21][22][23]. The spontaneous magnetostriction increases upon cooling reaching a value of ω S = 0.018 at T = 5 K. A more exhaustive work on the variation of magnetic moments with temperature will be done in a further study.…”

Section: Magneto-volume Anomaliesmentioning

confidence: 99%

Magnetic structure and magneto-volume anomalies in Er₂Fe₁₇compound

Álvarez

Gorría

Marcos

et al. 2011

J. Phys.: Conf. Ser.

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Specific heat ratio, Grüneisen parameter and Debye temperature of crude oil

Cited by 17 publications

References 12 publications

Thermo Optical Properties and Related Electronic Polarizabilities of MoO₃ Thin Films Using Ellipsometry

Thermo Optical Properties and Related Electronic Polarizabilities of MoO₃ Thin Films Using Ellipsometry

Ultrasonic evaluation of thermodynamic parameters of liquids under high pressure

Magnetic structure and magneto-volume anomalies in Er₂Fe₁₇compound

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Specific heat ratio, Grüneisen parameter and Debye temperature of crude oil

Cited by 17 publications

References 12 publications

Thermo Optical Properties and Related Electronic Polarizabilities of MoO3 Thin Films Using Ellipsometry

Thermo Optical Properties and Related Electronic Polarizabilities of MoO3 Thin Films Using Ellipsometry

Ultrasonic evaluation of thermodynamic parameters of liquids under high pressure

Magnetic structure and magneto-volume anomalies in Er2Fe17compound

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Product

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Thermo Optical Properties and Related Electronic Polarizabilities of MoO₃ Thin Films Using Ellipsometry

Thermo Optical Properties and Related Electronic Polarizabilities of MoO₃ Thin Films Using Ellipsometry

Magnetic structure and magneto-volume anomalies in Er₂Fe₁₇compound