This work proposes a new vision on the description of heat capacities of diamond-like compounds with sphalerite structure. The 4th group of diamond-like elements consists of, in addition to diamond, silicon, germanium, alpha tin, and diamond-like lead. Flerovium (¹¹⁴Fl) closes this group. There should be no other elements in this group according to the fine structure constant or the Sommerfeld constant α. In this case, the sphalerite structure has the ultimate value of the heat capacity С_р =30.5 J mol-at^-1 K^-1 or 3.67 R, and it falls on 114th element (¹¹⁴Fl). This quantity arises when plotting the isotherms Ln (C_p/R) vs Ln(N). The heat capacities of sphalerite phases were considered as a single system.
Keywords: Fine structure constant; A^IIIB^V, A^IIB^VI Phases; Pure Elements IV Group; Ultimate value C_p; Entropy; Similarity Method; Objective Function.
 

Heat capacities of sphalerite phases at the region of temperature 0-300K
[1] V. P. Vassiliev. Optimization of the Heat Capacities of Diamond-Like Compounds. J. Materials Science and Eng. B 11 (4-6) (2021) 76-80. doi: 10.17265/2161-6221/2021.4-6.004
[2] V. P. Vassiliev, A. F.Taldrik. Description of the heat capacity of solid phases by a multiparameter family of functions.872 (2021)159682. https://doi.org/10.1016/j.jallcom.2021.159682

Dr. Valery Vassiliev is a researcher in the laboratory of chemical thermodynamics of the Chemical Department in Lomonosov University (Moscow).
He has more 100 scientific publications, concerning thermodynamic properties and phase of diagrams of semiconductor system systems AII-BIV, AII-BVI, AIII-BV, AIII-BVI and metallic systems on the basis of rare earth metals. He is the author of review papers for the Handbook "Thermic constants of compounds", edited by academician V. P. Glushko, Edition VINITI (All-Union Institute of Scientific and Technical Information). He is a recognized specialist in the method of electromotive forces. He established a strict relationship between the thermodynamic constants of binary compounds and the Periodic Law.
1989-2012, he worked in the different Universities in France (Annecy, Marseille, Nancy, Paris), Italy (Genova), and Chine (Huizhou) as an Associated Professor.
2007, he defended his doctoral dissertation on Physical Chemistry on the topic: “Thermodynamic Properties and Phases Equilibriums some Semi-Conductors Systems and those Metallic”
1972, he defended the thesis of Dr. Ph. (Physical Chemistry) on the topic: «Thermodynamic properties of alloys and phases of equilibriums in thallium-sulphur, thallium-selenium and thallium-tellurium systems in the solid state».