Synthesis and Low-Temperature Thermodynamic Functions of Platinum Ditelluride

D. A. Chareev; Чареев Д. А.; A. V. Tyurin; Тюрин А. В.; N. A. Polotnyanko; Полотнянко Н. А.; P. V. Chareeva; Чареева П. В.

doi:10.31857/S0002337X23080031

Synthesis and Low-Temperature Thermodynamic Functions of Platinum Ditelluride

Authors: Chareev D.A.¹^,2^,3^,4, Tyurin A.V.⁵, Polotnyanko N.A.¹, Chareeva P.V.⁶
Affiliations:
1. Dubna State University
2. Korzhinskii Institute of Experimental Mineralogy, Russian Academy of Sciences
3. Institute of Physics and Technology, Yeltsin Federal University
4. Kazan (Volga Region) Federal University
5. Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, Moscow, Russia
6. Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry, Russian Academy of Sciences
Issue: Vol 59, No 8 (2023)
Pages: 859-865
Section: Articles
URL: https://journals.rcsi.science/0002-337X/article/view/231965
DOI: https://doi.org/10.31857/S0002337X23080031
EDN: https://elibrary.ru/SIADFD
ID: 231965

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Abstract
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Abstract

In this paper, we report the synthesis of crystalline platinum ditelluride, PtTe2, a synthetic analog of the mineral moncheite, and its thermodynamic properties. Using the isobaric heat capacity of PtTe2 determined in the range 2–305 K by the relaxation and adiabatic calorimetry methods, we have evaluated its standard thermodynamic functions: entropy, enthalpy increment, and reduced Gibbs energy. The following parameters have been obtained for PtTe2 at 298.15 K:
= 75.11 ± 0.15 J/(K mol), S° = 121.5 ± 0.2 J/(K mol), Н°(298.15 K) − Н°(0) = 16.69 ± 0.03 kJ/mol, and Ф° = 65.55 ± 0.13 J/(K mol). Using data in the literature and handbooks, we have estimated the standard Gibbs energy of formation of PtTe2: ΔfG°(PtTe2, cr, 298.15) = –75.4 ± 0.8 kJ/mol. Fractal analysis of the heat capacity data indicates that PtTe2 has a layered structure and that its Debye temperature is 250 K.

Keywords

heat capacity, palladium ditelluride, moncheite, platinum group metal chalcogenides, adiabatic calorimetry, relaxation calorimetry, entropy, thermodynamic functions

References

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