Synthesis and Low-Temperature Thermodynamic Functions of Platinum Ditelluride

• Published in: Inorganic materials 2023-08, Vol.59 (8), p.825-831
• Main Authors: Chareev, D. A., Tyurin, A. V., Polotnyanko, N. A., Chareeva, P. V.
• Format: Article
• Language: English
• Subjects: Chemistry; Chemistry and Materials Science; Industrial Chemistry/Chemical Engineering; Inorganic Chemistry; Materials Science
• ISSN: 0020-1685; 1608-3172
• DOI: 10.1134/S0020168523080034

— In this paper, we report the synthesis of crystalline platinum ditelluride, PtTe 2 , a synthetic analog of the mineral moncheite, and its thermodynamic properties. Using the isobaric heat capacity of PtTe 2 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 PtTe 2 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 PtTe 2 : Δ f G °(PtTe 2 , cr, 298.15) = –75.4 ± 0.8 kJ/mol. Fractal analysis of the heat capacity data indicates that PtTe 2 has a layered structure and that its Debye temperature is 250 K.