Study on Thermodynamic Properties of Fe³⁺-Substituted Yttrium Iron Garnets

• Authors: K. Modi , P. Jha , P. Raval , N. Vasoya , K. Vyas , U. Meshiya , R. Gohil , K. Jadav , N. Gohil , P. Sharma
• Languages of publication: EN

Abstracts

EN

This paper presents the molar heat capacity at constant volume C_{V} and characteristic Debye temperature θ, determination for the garnet system, Y_{3-x}Fe_{5+x}O_{12}, x=0.0, 0.1, 0.3, and 0.5 at 300 K. The θ values determined from Waldron's approach and those calculated using ultrasonic mean sound velocity, V_{mo}, are in agreement. C_{V} values calculated from the Einstein theory are consistent with the reported one and theoretically expected values using the Dulong-Petit law, but Waldron's approach based on the Debye theory and the Debye T³ law fail to estimate consistent C_{V} values. The result has been discussed in the light of key physical differences between the two theories. The applicability of the Kieffer model for molar heat capacity at constant pressure, C_{p}, determination has been tested. Finally, an attempt has been made to estimate electronic contribution and the temperature at which the lattice contribution and electronic contribution to the molar heat capacity become comparable.

Keywords

EN

75.47.Lx; 05.70.-a

Discipline

• 75.47.Lx: Magnetic oxides
• 05.70.-a: Thermodynamics(see also section 64 Equations of state, phase equilibria, and phase transitions, and section 65 Thermal properties of condensed matter; for chemical thermodynamics, see 82.60.-s; for thermodynamics of plasmas, see 52.25.Kn; for thermodynamic properties of quantum fluids, see 67.25.bd, and 67.30.ef; for thermodynamics of nanoparticles, see 82.60.Qr, and 65.80.-g; for thermodynamic processes in astrophysics, see 95.30.Tg; for thermodynamics in volcanology, see 91.40.Pc)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2016
• Volume: 130
• Issue: 3
• Pages: 778-784

Dates

published

2016-09

received

2016-02-22

(unknown)

2016-06-28

Contributors

author

K. Modi

• Department of Physics, Saurashtra University, Rajkot 360 005, India

author

P. Jha

• Department of Physics, Faculty of Science, M.S. University of Baroda, Vadodara 390 002, India

author

P. Raval

• Department of Physics, Saurashtra University, Rajkot 360 005, India

author

N. Vasoya

• Department of Physics, Faculty of Science, M.S. University of Baroda, Vadodara 390 002, India

author

K. Vyas

• Department of Physics, Saurashtra University, Rajkot 360 005, India

author

U. Meshiya

• Department of Physics, Saurashtra University, Rajkot 360 005, India

author

R. Gohil

• Department of Physics, Saurashtra University, Rajkot 360 005, India

author

K. Jadav

• Department of Physics, Saurashtra University, Rajkot 360 005, India

author

N. Gohil

• Department of Physics, Saurashtra University, Rajkot 360 005, India

author

P. Sharma

• M.N. College, Visnagar 384 315, India

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Identifiers

DOI

10.12693/APhysPolA.130.778