Кафедри
Постійне посилання на розділhttps://repository.kpi.kharkov.ua/handle/KhPI-Press/35393
Переглянути
3 результатів
Результати пошуку
Документ Concentration anomaly of heat capacity in PbTe based solid solutions(2002) Rogacheva, E. I.; Sinelnik, N. A.; Krivulkin, I. M.The temperature dependences of the heat capacity in the Pb₁₋ₓMnₓTe and Pb₁₋ₓGeₓTe (x = 0-0.04) solid solutions based on PbTe were obtained in the temperature range of 100-670 K. Pronounced peaks were observed in the isotherms of the heat capacity in the vicinity of x ~ 0.01-0.015. The presence of the peaks is explained on the basis of the idea about the existence of concentration phase transitions of percolation type, which take place in any solid solution and are related to transformation of impurity discontinuum into impurity continuum.Публікація Defects of non-stoichiometry and dynamic stability of SnTe crystal lattice(1993) Rogacheva, E. I.; Sinelnik, N. A.; Nashchekina, O. N.; Popov, V. P.; Lobkovskaya, T. A.The temperature dependencies of coefficient of linear expansion α in the range of 4.2-300 K were obtained for SnTe samples with various degrees of deviation from stoichiometry. For the sample of stoichiometric composition in the α vs. temperature curves the anomalies connected with ferroelectric phase transition were detected. It was found that within cubic phase existence region α isotherms have a minimum at 50.4 at.% Te. Maximum dynamic stability at indicated composition is believed to be associated with the formation of vacancy superstructure.Публікація Concentration anomalies of properties in Pb₁₋ₓGeₓTe solid solutions(1993) Rogacheva, E. I.; Sinelnik, N. A.; Nashchekina, O. N.The investigation of electrical conductivity, coefficient of thermal electromotive force, Hall coefficient, microhardness and mobility in Pb₁₋ₓGeₓΤe (x = 0 : 0.1) alloys in the temperature range of 77-300 K was carried out. Anomalies were detected in isotherms of properties in the vicinity of x = 0.008. The anomalies were treated as a manifestation of concentration phase transitions occurring in solid solutions of any kind and associated with existence of critical concentration (percolation threshold) at which the uninterrupted chain of interactions between impurity atoms is formed.