ИСТИНА

Previous review articles evidenced the relation of thermodynamic data with Periodic Law [1-3] and established a strict relationship between the enthalpy of formation, melting point and the atomic numbers of components in the semiconductor AIIIBV phases, with diamond-like structure of sphalerite and wurtzite types. The proposed model was used for the critical assessment of the thermodynamic properties of isostructural compounds. The relationship between the reduced enthalpy ( ), standard entropy ( ), reduced Gibbs energy and the sum of the atomic numbers (Zi = ZA + ZB) has been used for a critical assessment of the thermodynamic properties of AIIIBV phases [1]. The Similarity Method was used for the critical analysis of specific heat for solid state AIIIBV isostructural phases. A critical analysis of heat capacities was carried out for the pure elements of the Periodic System fourth group (C, Si, Ge, Sn) and isostructural phases AIIIBV and AIIBVI. [2]. Phases with the same sum of atomic numbers of elements (Zi), such as BN (hex) Zi = 12 and glassy pure carbon Z = 6; BP and AlN (Zi = 20); AlP (Zi = 28) and pure Si (Z = 14); BAs and GaN (Zi = 38); AlAs and ZnS (Zi = 46); AlSb, GaAs, InP, CdS (Zi = 64) and pure Ge (Z = 32); GaSb, InAs, and CdSe (Zi = 82); InSb, CdTe (Zi = 100) and pure gray Sn (Z= 50); have the same heat capacity experimental values in the solid state within the experimental uncertainty. The second group is concerning of the rare earth metals and their compounds with other elements. The "tetrad-effect" phenomenon was established and used for the analysis, correction and prediction of thermodynamic data for the lanthanide (Ln) compounds [3]. References: [1] V.P. Vassiliev, B. Legendre, V.P. Zlomanov, Intermetallics, Vol.19 (2011), 1891. [2] V.P. Vassiliev, A.F. Taldrik, S.A. Kulinich, J. Alloys Comp., Vol. 552 (2013), 254. [3] V.P. Vassiliev, and V.A. Lysenko, Electrochim. Acta, Vol. 222 (2016), 1770.