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The process of crystallization of the PbSe liquidus surface in the Cu – Pb – Se system was investigated. Equations were obtained to calculate the partial excess energy functions of mixing lead and selenium for Cu – Pb – Se alloys saturated with lead selenide. The obtained analytical dependences T – x – y and p (Se2) –T – x were visualized. It found that when describing the effect of selenium partial pressure on Gibbs partial molar free energy at high pressure, it is necessary to take into account the contribution of the volumetric member. Changes in the energy of defect formation from the electronic chemical potential function in samples based on PbSe in Cu – Pb – Se were studied. Proceeding from the constructed Cu – Pb – Se phase diagram of the isothermal section, a single phase region was determined based on PbSe and two phase regions between PbSe and copper selenides.

THERMODYNAMIC ANALYSIS AND DEFECTION FORMATION IN ALLOYS ON THE BASIS OF LEAD SELENIDE CONTAINING COPPER