Ihor Horichok | Vasyl Stefanyk Precarpathian National University (original) (raw)
Papers by Ihor Horichok
Materials Science in Semiconductor Processing
The results of the study of thermoelectric properties and the defective subsystem of lead telluri... more The results of the study of thermoelectric properties and the defective subsystem of lead telluride doped by antimony PbTe:Sb (8%), promising material for the creation of heat energy converters on their basis. The regularities in the behavior of the properties investigated, which are due to the biphasicity of the material and the significant influence of the technological factors of obtaining samples on their defective subsystem, are established. The modeling of the defect subsystem of PbTe:Sb crystals was carried out taking into account the presence of additional phase inclusions and it was found that dominant point defects are internode atoms of antimony.
Formation of thermocouples by pressing powder of thermoelectric material with microand nanosize r... more Formation of thermocouples by pressing powder of thermoelectric material with microand nanosize range creates large internal borders for additional phonon scattering. However, it need not only reduce the thermal conductivity, but also increase the Seebeck coefficient to improve the thermoelectric properties of material. For this case, around thermoelectric grain PbTe of the size of (0.5-1.0) micrometers prompted to create nano-channels for the stream of an electric current. In this paper was development technology of the conductive nano-channels on the base of colloidal Silver. It was finding that the introduction of Ag nanoparticles (size 50 nm), not only reduces the thermal conductivity, but also increases the Seebeck coefficient after additional throttling of electrons on the barriers of Silver nanoparticles. Thermal conductivity of (0.06-0.2) W/(m·K) has been achieved in the case of the scattering of medium-wave phonons (MWP). The absolute value of Seebeck coefficient in these...
Journal of the American Ceramic Society
Electrophysical properties (specific conductivity, Seebeck coefficient, Hall effect) of the lead ... more Electrophysical properties (specific conductivity, Seebeck coefficient, Hall effect) of the lead telluride obtained by pressing of the powder were investigated. In this case, the powder was pre-heat treated at 300 oC in the air to saturate it with oxygen. To interpret the experimental data obtained, a model of a defect subsystem of crystals of lead telluride with impurity of oxygen is proposed.
Фізика і хімія твердого тіла
The results of study of thermoelectric properties of lead telluride obtained by method of powder ... more The results of study of thermoelectric properties of lead telluride obtained by method of powder pressing arepresented. A modified electrical model for interpreting the empirical dependences σ (T) is proposed, according towhich the compressed sample is represented by a system of crystallites with intergranular boundaries whoseproperties differ along and across the compression axis.
Journal of Alloys and Compounds
Journal of Crystal Growth
Based on the comparison of theoretical calculations of the point defects formation energy by ab i... more Based on the comparison of theoretical calculations of the point defects formation energy by ab initio method and their concentration by the thermodynamic potentials method with the experimental data of the Hall effect study and the homogeneity region width of zinc and cadmium tellurides, it was shown that in the ZnTe crystals, as in the CdTe crystals, at the chalcogen saturation the dominant defects are cationic vacancies and antistructural chalcogen atoms, whose point symmetry corresponds to the Td group. When both zinc and cadmium tellurides are saturated with the metal, the most probable type of the dominant point defects is the electroneutral chalcogen vacancy, the formation of which is accompanied by the significant relaxation of the nearest atoms and loss of initial symmetry.
Physica E: Low-dimensional Systems and Nanostructures
Фізика і хімія твердого тіла
The factors influencing the value of the thermal conductivity coefficient of thermoelectric mater... more The factors influencing the value of the thermal conductivity coefficient of thermoelectric materials based onlead telluride obtained by powder pressing method have been analyzed. The model is presented and itsparameters are defined, which explains qualitatively and quantitatively the temperature dependences of thethermal conductivity coefficient of PbTe and PbSnAgTe.
Chemistry & Chemical Technology
The defective subsystem of samarium monosulphide crystals in metallic phases with different stoic... more The defective subsystem of samarium monosulphide crystals in metallic phases with different stoichiometric deviation has been investigated. Based on the proposed model of defective subsystem the concentration dependence of samarium monosulphide density has been explained and the temperature dependence of solidus line with metal excess has been determined.
Journal of Electronic Materials, 2015
Formation of thermocouples by pressing powder of thermoelectric material with micro- and nano- si... more Formation of thermocouples by pressing powder of thermoelectric material with micro- and nano- size
range creates large internal borders for additional phonon scattering. However, it need not only reduce the
thermal conductivity, but also increase the Seebeck coefficient to improve the thermoelectric properties of
material. For this case, around thermoelectric grain PbTe of the size of (0.5-1.0) micrometers prompted to
create nano-channels for the stream of an electric current. In this paper was development technology of the
conductive nano-channels on the base of colloidal Silver. It was finding that the introduction of Ag nanoparticles
(size 50 nm), not only reduces the thermal conductivity, but also increases the Seebeck coefficient
after additional throttling of electrons on the barriers of Silver nanoparticles. Thermal conductivity of
(0.06-0.2) W/(m·K) has been achieved in the case of the scattering of medium-wave phonons (MWP). The
absolute value of Seebeck coefficient in these conditions increases up to 340 V/K.
Materials Science in Semiconductor Processing
The results of the study of thermoelectric properties and the defective subsystem of lead telluri... more The results of the study of thermoelectric properties and the defective subsystem of lead telluride doped by antimony PbTe:Sb (8%), promising material for the creation of heat energy converters on their basis. The regularities in the behavior of the properties investigated, which are due to the biphasicity of the material and the significant influence of the technological factors of obtaining samples on their defective subsystem, are established. The modeling of the defect subsystem of PbTe:Sb crystals was carried out taking into account the presence of additional phase inclusions and it was found that dominant point defects are internode atoms of antimony.
Formation of thermocouples by pressing powder of thermoelectric material with microand nanosize r... more Formation of thermocouples by pressing powder of thermoelectric material with microand nanosize range creates large internal borders for additional phonon scattering. However, it need not only reduce the thermal conductivity, but also increase the Seebeck coefficient to improve the thermoelectric properties of material. For this case, around thermoelectric grain PbTe of the size of (0.5-1.0) micrometers prompted to create nano-channels for the stream of an electric current. In this paper was development technology of the conductive nano-channels on the base of colloidal Silver. It was finding that the introduction of Ag nanoparticles (size 50 nm), not only reduces the thermal conductivity, but also increases the Seebeck coefficient after additional throttling of electrons on the barriers of Silver nanoparticles. Thermal conductivity of (0.06-0.2) W/(m·K) has been achieved in the case of the scattering of medium-wave phonons (MWP). The absolute value of Seebeck coefficient in these...
Journal of the American Ceramic Society
Electrophysical properties (specific conductivity, Seebeck coefficient, Hall effect) of the lead ... more Electrophysical properties (specific conductivity, Seebeck coefficient, Hall effect) of the lead telluride obtained by pressing of the powder were investigated. In this case, the powder was pre-heat treated at 300 oC in the air to saturate it with oxygen. To interpret the experimental data obtained, a model of a defect subsystem of crystals of lead telluride with impurity of oxygen is proposed.
Фізика і хімія твердого тіла
The results of study of thermoelectric properties of lead telluride obtained by method of powder ... more The results of study of thermoelectric properties of lead telluride obtained by method of powder pressing arepresented. A modified electrical model for interpreting the empirical dependences σ (T) is proposed, according towhich the compressed sample is represented by a system of crystallites with intergranular boundaries whoseproperties differ along and across the compression axis.
Journal of Alloys and Compounds
Journal of Crystal Growth
Based on the comparison of theoretical calculations of the point defects formation energy by ab i... more Based on the comparison of theoretical calculations of the point defects formation energy by ab initio method and their concentration by the thermodynamic potentials method with the experimental data of the Hall effect study and the homogeneity region width of zinc and cadmium tellurides, it was shown that in the ZnTe crystals, as in the CdTe crystals, at the chalcogen saturation the dominant defects are cationic vacancies and antistructural chalcogen atoms, whose point symmetry corresponds to the Td group. When both zinc and cadmium tellurides are saturated with the metal, the most probable type of the dominant point defects is the electroneutral chalcogen vacancy, the formation of which is accompanied by the significant relaxation of the nearest atoms and loss of initial symmetry.
Physica E: Low-dimensional Systems and Nanostructures
Фізика і хімія твердого тіла
The factors influencing the value of the thermal conductivity coefficient of thermoelectric mater... more The factors influencing the value of the thermal conductivity coefficient of thermoelectric materials based onlead telluride obtained by powder pressing method have been analyzed. The model is presented and itsparameters are defined, which explains qualitatively and quantitatively the temperature dependences of thethermal conductivity coefficient of PbTe and PbSnAgTe.
Chemistry & Chemical Technology
The defective subsystem of samarium monosulphide crystals in metallic phases with different stoic... more The defective subsystem of samarium monosulphide crystals in metallic phases with different stoichiometric deviation has been investigated. Based on the proposed model of defective subsystem the concentration dependence of samarium monosulphide density has been explained and the temperature dependence of solidus line with metal excess has been determined.
Journal of Electronic Materials, 2015
Formation of thermocouples by pressing powder of thermoelectric material with micro- and nano- si... more Formation of thermocouples by pressing powder of thermoelectric material with micro- and nano- size
range creates large internal borders for additional phonon scattering. However, it need not only reduce the
thermal conductivity, but also increase the Seebeck coefficient to improve the thermoelectric properties of
material. For this case, around thermoelectric grain PbTe of the size of (0.5-1.0) micrometers prompted to
create nano-channels for the stream of an electric current. In this paper was development technology of the
conductive nano-channels on the base of colloidal Silver. It was finding that the introduction of Ag nanoparticles
(size 50 nm), not only reduces the thermal conductivity, but also increases the Seebeck coefficient
after additional throttling of electrons on the barriers of Silver nanoparticles. Thermal conductivity of
(0.06-0.2) W/(m·K) has been achieved in the case of the scattering of medium-wave phonons (MWP). The
absolute value of Seebeck coefficient in these conditions increases up to 340 V/K.