The phase equilibria of the SnBi2Te4-PbBi2Te4-Bi2Te3 system were experimentally studied using differential thermal analysis (DTA), X-ray diffraction (XRD), and scanning electron microscopy (SEM) techniques. According to the experimental results, the isothermal section of the system at 300 K were constructed and 4 single-phase and 3 two-phase regions were identified. It was shown that along with previously confirmed SnBi2Te4–PbBi2Te4 and SnBi4Te7–PbBi4Te7 sections, SnBi6Te10–PbBi6Te10 section forms continuous series of solid solutions with a tetradymite-type layered structure. Lattice parameters of solid solutions were determined by full-profile Rietveld refinements and results show that both a and c parameters increase linearly with the Pb concentration according to Vegard's law. This study can help elucidate the phase equilibria of the SnTe-PbTe-Bi2Te3 pseudo-ternary system which provides important information for the design of new tetradymite-type layered phases with topological insulator and thermoelectric properties.
{"title":"Experimental investigation of the solid phase equilibria at 300 K in the SnBi2Te4-PbBi2Te4-Bi2Te3 system","authors":"A.I. Aghazade, E.N. Orujlu, Z.E. Salimov, A.N. Mammadov, M.B. Babanly","doi":"10.15330/pcss.24.3.453-459","DOIUrl":"https://doi.org/10.15330/pcss.24.3.453-459","url":null,"abstract":"The phase equilibria of the SnBi2Te4-PbBi2Te4-Bi2Te3 system were experimentally studied using differential thermal analysis (DTA), X-ray diffraction (XRD), and scanning electron microscopy (SEM) techniques. According to the experimental results, the isothermal section of the system at 300 K were constructed and 4 single-phase and 3 two-phase regions were identified. It was shown that along with previously confirmed SnBi2Te4–PbBi2Te4 and SnBi4Te7–PbBi4Te7 sections, SnBi6Te10–PbBi6Te10 section forms continuous series of solid solutions with a tetradymite-type layered structure. Lattice parameters of solid solutions were determined by full-profile Rietveld refinements and results show that both a and c parameters increase linearly with the Pb concentration according to Vegard's law. This study can help elucidate the phase equilibria of the SnTe-PbTe-Bi2Te3 pseudo-ternary system which provides important information for the design of new tetradymite-type layered phases with topological insulator and thermoelectric properties.","PeriodicalId":20137,"journal":{"name":"Physics and Chemistry of Solid State","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135690667","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-13DOI: 10.15330/pcss.24.3.460-466
M.K. Ismayilova, I. I. Mustafayev, S.Z. Melikova, F.N. Nurmammadova, M.H. Aliyeva
This paper's goal is to investigate how petroleum's n-alkane isomerization reaction occurs on the surface of a solid nanocatalyst. In this experiment, the isomerization of aromatic-rich crude oil is being studied as a result of radiation exposure. It was discovered that sodium-rich bentonite –solid acid, from the Alpoid deposit works well as a catalyst for refining petroleum. Possible mechanisms of the radio-catalytic reaction that converts n-alkanes to branched hydrocarbons have been researched by methods of FT- IR spectroscopy and gas chromatography. The effect of acidity type of the nanostructured bentonite clay on Lewis acid cites is proposed to explain observed results. Additional radiation energy, which is mainly generated due to the nanobentonite volume, results in a more efficient aromatic- rich petroleum radiolysis process. Also, it was investigated the dynamics of dose –dependent changes in the amount of branched hydrocarbons. One of the primary objectives of this research work is increasing the efficiency of transformation of adsorbed beam energy in solid phase to the system and improvement of hydrocarbon isomerization reactions in crude oil. The results of hydrocarbon transformations are discussed in terms of the behavior of excited electrons in solids. Novel eco-friendly nanocatalyst creates new opportunities for hydrocarbons with multi- branched structures.
{"title":"Radiation-induced isomerization reaction mechanism of hydrocarbons on the surface of solid acid","authors":"M.K. Ismayilova, I. I. Mustafayev, S.Z. Melikova, F.N. Nurmammadova, M.H. Aliyeva","doi":"10.15330/pcss.24.3.460-466","DOIUrl":"https://doi.org/10.15330/pcss.24.3.460-466","url":null,"abstract":"This paper's goal is to investigate how petroleum's n-alkane isomerization reaction occurs on the surface of a solid nanocatalyst. In this experiment, the isomerization of aromatic-rich crude oil is being studied as a result of radiation exposure. It was discovered that sodium-rich bentonite –solid acid, from the Alpoid deposit works well as a catalyst for refining petroleum. Possible mechanisms of the radio-catalytic reaction that converts n-alkanes to branched hydrocarbons have been researched by methods of FT- IR spectroscopy and gas chromatography. The effect of acidity type of the nanostructured bentonite clay on Lewis acid cites is proposed to explain observed results. Additional radiation energy, which is mainly generated due to the nanobentonite volume, results in a more efficient aromatic- rich petroleum radiolysis process. Also, it was investigated the dynamics of dose –dependent changes in the amount of branched hydrocarbons. One of the primary objectives of this research work is increasing the efficiency of transformation of adsorbed beam energy in solid phase to the system and improvement of hydrocarbon isomerization reactions in crude oil. The results of hydrocarbon transformations are discussed in terms of the behavior of excited electrons in solids. Novel eco-friendly nanocatalyst creates new opportunities for hydrocarbons with multi- branched structures.","PeriodicalId":20137,"journal":{"name":"Physics and Chemistry of Solid State","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135690109","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-13DOI: 10.15330/pcss.24.3.448-452
D. Maryskevych, Ya. Tokaychuk, L. Akselrud, R. Gladyshevskii
The new ternary intermetallic compound ZrAl0.23Ge1.77 was observed after annealing at 600°C, and its crystal structure was determined by X-ray single-crystal diffraction. The structure (own structure type, Pearson symbol tI32-8, space group I41/amd, a = 3.8013(2), c = 29.893(3) Å, Z = 4) is a variant with partial positional disorder of the pseudo-binary structure type Zr0.75AlSi1.25. The structures are members of the family of linear intergrowth structures composed of AlB2-type slabs (layers of centered trigonal prisms) and CaF2-type slabs (layers of empty “half octahedra”), here in the ratio 1:2. The structure of ZrAl0.23Ge1.77 is characterized by statistical occupation by Al and Ge of one of the sites forming the CaF2-type slabs and positional disorder of the Ge atoms that form zig-zag chains along the crystallographic direction [100].
在600℃退火后，观察到新的三元金属间化合物ZrAl0.23Ge1.77，并通过x射线单晶衍射测定了其晶体结构。该结构(自身结构类型，Pearson符号tI32-8，空间群I41/amd, a = 3.8013(2)， c = 29.893(3) Å， Z = 4)是伪二元结构类型Zr0.75AlSi1.25的一个具有部分位置无序的变体。该结构是线性共生结构家族的成员，由alb2型板(中心三角棱镜层)和caf2型板(空的“半八面体”层)组成，这里的比例为1:2。ZrAl0.23Ge1.77的结构特点是Al和Ge占据了形成caf2型板的一个位置，并且Ge原子沿晶体方向形成锯齿状链的位置紊乱[100]。
{"title":"The structure type ZrAl0.23Ge1.77","authors":"D. Maryskevych, Ya. Tokaychuk, L. Akselrud, R. Gladyshevskii","doi":"10.15330/pcss.24.3.448-452","DOIUrl":"https://doi.org/10.15330/pcss.24.3.448-452","url":null,"abstract":"The new ternary intermetallic compound ZrAl0.23Ge1.77 was observed after annealing at 600°C, and its crystal structure was determined by X-ray single-crystal diffraction. The structure (own structure type, Pearson symbol tI32-8, space group I41/amd, a = 3.8013(2), c = 29.893(3) Å, Z = 4) is a variant with partial positional disorder of the pseudo-binary structure type Zr0.75AlSi1.25. The structures are members of the family of linear intergrowth structures composed of AlB2-type slabs (layers of centered trigonal prisms) and CaF2-type slabs (layers of empty “half octahedra”), here in the ratio 1:2. The structure of ZrAl0.23Ge1.77 is characterized by statistical occupation by Al and Ge of one of the sites forming the CaF2-type slabs and positional disorder of the Ge atoms that form zig-zag chains along the crystallographic direction [100].","PeriodicalId":20137,"journal":{"name":"Physics and Chemistry of Solid State","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135733596","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The Ag8SnS6 crystal was synthesized by directly melting a high-purity stoichiometric mixture of elementary Ag, Sn, and S in a sealed quartz ampoule. This argyrodite crystallizes in the orthorhombic structure (Pna21 space group (No. 33)) at room temperature. The theoretical first-principle calculations of the electronic band structure and density of states of a αʹʹ-Ag8SnS6 crystal are estimated by the generalized gradient approximation (GGA) and local density approximation (LDA). A Perdew–Burke–Ernzerhof functional (PBE) and (PBEsol) were utilized for GGA calculation. All calculated parameters correlate well with known experimental data. Based on the electronic band structure, the effective mass of electrons and holes was calculated. The anisotropic behavior of electronic band structure is discussed.
{"title":"Synthesis, crystal and energy structure of the Ag8SnS6 crystal","authors":"I.V. Semkiv, H.A. Ilchuk, N.Y. Kashuba, V.M. Kordan, A.I. Kashuba","doi":"10.15330/pcss.24.3.441-447","DOIUrl":"https://doi.org/10.15330/pcss.24.3.441-447","url":null,"abstract":"The Ag8SnS6 crystal was synthesized by directly melting a high-purity stoichiometric mixture of elementary Ag, Sn, and S in a sealed quartz ampoule. This argyrodite crystallizes in the orthorhombic structure (Pna21 space group (No. 33)) at room temperature. The theoretical first-principle calculations of the electronic band structure and density of states of a αʹʹ-Ag8SnS6 crystal are estimated by the generalized gradient approximation (GGA) and local density approximation (LDA). A Perdew–Burke–Ernzerhof functional (PBE) and (PBEsol) were utilized for GGA calculation. All calculated parameters correlate well with known experimental data. Based on the electronic band structure, the effective mass of electrons and holes was calculated. The anisotropic behavior of electronic band structure is discussed.","PeriodicalId":20137,"journal":{"name":"Physics and Chemistry of Solid State","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135886174","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The paper proposes a model of an electromagnetic radiation sensor that uses the precession of the magnetization vector in a ferromagnet (ferromagnetic resonance) as a result of absorbing the energy of an incident electromagnetic wave, the generation of a spin current as a result of this precession, the generation of a spin-polarized current as a result of the passage of a spin current in a non-magnetic metal, and a change in the direction of magnetization of a ferromagnetic layer with a low coercive force (free layer) due to the passage of a spin-polarized current. Then the radiation will be detected by its effect on the electrical resistance of the entire structure, which depends on the mutual directions (parallel or antiparallel) of magnetization of the free and fixed (with a large coercive force) ferromagnetic layers (phenomenon of giant magnetic resistance). The dependence of the spin-polarized current in the device on the frequency and amplitude of the incident electromagnetic wave with linear polarization was calculated. A method of calculating the range of amplitude and frequency values of radiation that can be detected by the sensor has been developed. The parameters of this model are the detection time and the number of spin gates in one sensor. Calculations are given for a ferromagnetic layer made of permalloy and for spin valves with four different critical current values that determine the process of remagnetization of the free layer: 20, 50, 100, and 200 microamps.
{"title":"Electromagnetic field detectors based on spintronics devices","authors":"R.L. Politanskyi, P.M. Shpatar, M.V. Vistak, I.T. Kogut, I.S. Diskovskyi, Yu.A. Rudyak","doi":"10.15330/pcss.24.3.433-440","DOIUrl":"https://doi.org/10.15330/pcss.24.3.433-440","url":null,"abstract":"The paper proposes a model of an electromagnetic radiation sensor that uses the precession of the magnetization vector in a ferromagnet (ferromagnetic resonance) as a result of absorbing the energy of an incident electromagnetic wave, the generation of a spin current as a result of this precession, the generation of a spin-polarized current as a result of the passage of a spin current in a non-magnetic metal, and a change in the direction of magnetization of a ferromagnetic layer with a low coercive force (free layer) due to the passage of a spin-polarized current. Then the radiation will be detected by its effect on the electrical resistance of the entire structure, which depends on the mutual directions (parallel or antiparallel) of magnetization of the free and fixed (with a large coercive force) ferromagnetic layers (phenomenon of giant magnetic resistance). The dependence of the spin-polarized current in the device on the frequency and amplitude of the incident electromagnetic wave with linear polarization was calculated. A method of calculating the range of amplitude and frequency values of radiation that can be detected by the sensor has been developed. The parameters of this model are the detection time and the number of spin gates in one sensor. Calculations are given for a ferromagnetic layer made of permalloy and for spin valves with four different critical current values that determine the process of remagnetization of the free layer: 20, 50, 100, and 200 microamps.","PeriodicalId":20137,"journal":{"name":"Physics and Chemistry of Solid State","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135886021","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The radiation-chemical decomposition of n-hexane in the nano-ZrO2 +n-hexane system under the action of gamma radiation at room temperature is studied by the method of Fourier-IR spectroscopy. The molecular and dissociative form of adsorption of n-hexane in zirconium nanodioxide was revealed. The intermediate products of the radiation-heterogeneous decomposition of n-hexane were analyzed.
{"title":"FT-IR Spectroscopic Study of the Radiation-Chemical Decomposition of n-Hexane on Nano-ZrO2","authors":"T.N. Agayev, N.N. Gadzhieva, S.Z. Melikova, Sh.Z. Musayeva, A.G. Aliyev","doi":"10.15330/pcss.24.3.429-432","DOIUrl":"https://doi.org/10.15330/pcss.24.3.429-432","url":null,"abstract":"The radiation-chemical decomposition of n-hexane in the nano-ZrO2 +n-hexane system under the action of gamma radiation at room temperature is studied by the method of Fourier-IR spectroscopy. The molecular and dissociative form of adsorption of n-hexane in zirconium nanodioxide was revealed. The intermediate products of the radiation-heterogeneous decomposition of n-hexane were analyzed.","PeriodicalId":20137,"journal":{"name":"Physics and Chemistry of Solid State","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135204186","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-04DOI: 10.15330/pcss.24.3.422-428
L. Hrytsak, B. Turko, V. Vasil’ev, Y. Eliyashevskyy, A. Kostruba, A. Hrytsak
Zinc oxide films with different levels of yttrium doping are deposited on glass substrates, using radio-frequency magnetron sputtering. Photocatalytic properties were investigated for such Y-doping weight concentration: 0, 2.4, 3.9, 4.7 wt. %. The studies showed that the Y-doping significantly improves the photocatalytic activity of the ZnO thin films. It was shown that the ZnO:Y 3.9 wt. % presents the highest degradation efficiency of 100 % during 80 minutes and the largest rate constant 9.6 · 10-2 min-1 among all samples.
{"title":"Effect of yttrium doping on the photocatalytic properties of ZnO thin films","authors":"L. Hrytsak, B. Turko, V. Vasil’ev, Y. Eliyashevskyy, A. Kostruba, A. Hrytsak","doi":"10.15330/pcss.24.3.422-428","DOIUrl":"https://doi.org/10.15330/pcss.24.3.422-428","url":null,"abstract":"Zinc oxide films with different levels of yttrium doping are deposited on glass substrates, using radio-frequency magnetron sputtering. Photocatalytic properties were investigated for such Y-doping weight concentration: 0, 2.4, 3.9, 4.7 wt. %. The studies showed that the Y-doping significantly improves the photocatalytic activity of the ZnO thin films. It was shown that the ZnO:Y 3.9 wt. % presents the highest degradation efficiency of 100 % during 80 minutes and the largest rate constant 9.6 · 10-2 min-1 among all samples.","PeriodicalId":20137,"journal":{"name":"Physics and Chemistry of Solid State","volume":"79 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135453946","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The results of the study of the characteristics of a pulsed source of time-synchronous UV radiation streams of silver atoms and ions and micro-nanostructures of silver sulfide are given. An overvoltage nanosecond discharge was ignited in nitrogen between electrodes made of silver sulfide (Ag2S) at a distance between electrodes of 2 mm. Silver sulfide vapors were introduced into the gas-vapor mixture "Nitrogen - Ag2S" due to the ectonic mechanism. The voltage and current pulses, the pulsed power of the discharge, the energy contribution to the plasma for one pulse at pulse repetition frequencies of 40-1000 Hz were studied. The spectral characteristics of the discharge and the spatial characteristics of the microstructures deposited from the discharge plasma on a quartz substrate installed near the electrode system were studied.
The discharge can be used as a source of bactericidal radiation and a source of microstructures based on silver sulfide, as well as a plasma chemical reactor for the synthesis of thin microstructured films of silver sulfide.
{"title":"Gas Discharge Source of Synchronous Flows of UV Radiation and Silver Sulphide Microstructures","authors":"O.K. Shuaibov, O.Y. Minya, R.V. Hrytsak, Yu.Yu. Bilak, A.O Malinina, Z.T. Homoki, M.M. Pop, O.M. Konoplyov","doi":"10.15330/pcss.24.3.417-421","DOIUrl":"https://doi.org/10.15330/pcss.24.3.417-421","url":null,"abstract":"The results of the study of the characteristics of a pulsed source of time-synchronous UV radiation streams of silver atoms and ions and micro-nanostructures of silver sulfide are given. An overvoltage nanosecond discharge was ignited in nitrogen between electrodes made of silver sulfide (Ag2S) at a distance between electrodes of 2 mm. Silver sulfide vapors were introduced into the gas-vapor mixture \"Nitrogen - Ag2S\" due to the ectonic mechanism. The voltage and current pulses, the pulsed power of the discharge, the energy contribution to the plasma for one pulse at pulse repetition frequencies of 40-1000 Hz were studied. The spectral characteristics of the discharge and the spatial characteristics of the microstructures deposited from the discharge plasma on a quartz substrate installed near the electrode system were studied.
 The discharge can be used as a source of bactericidal radiation and a source of microstructures based on silver sulfide, as well as a plasma chemical reactor for the synthesis of thin microstructured films of silver sulfide.
","PeriodicalId":20137,"journal":{"name":"Physics and Chemistry of Solid State","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135936916","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-29DOI: 10.15330/pcss.24.2.392-402
Farha Naaz, P. Lahiri, C. Kumari, Hemant Kumar Dubey
Spinel type nano ferrite compound MgFe2O4 was synthesized through sol gel technique using metal nitrates as precursors. The phase composition, morphology and elemental analysis of magnesium ferrite (MgFe2O4) were performed by X-ray diffraction, fourier transform infrared, atomic force microscopy, energy dispersive x-ray and scanning electron microscopy, analyses. The sample's X-ray diffraction pattern verifies the existence of single phase material, with the size of its crystallites estimated to be 39.9 nm. Fourier transform infrared examination supported metal-oxygen vibrations corresponding to tetrahedral and octahedral sites, respectively. From scanning electron microscopy image, grain size obtained about 97.7 nm. Raman spectra of the sample shows five Raman active modes (A1g + Eg + 3F2g), which is compatible with the spinel structure. Magnetic measurement study at room temperature shows a hysteresis loop behaviour with a low saturation magnetization value, 27.192 emu g-1 and a small coercivity value. The optical band gap determined using UV-visible transmittance spectra. Additionally, X-ray photoelectron spectroscopy are used to confirm oxidation states and explore the chemical composition of the sample.
{"title":"Spectroscopic, Magnetic and Morphological studies of MgFe2O4 Nanopowder","authors":"Farha Naaz, P. Lahiri, C. Kumari, Hemant Kumar Dubey","doi":"10.15330/pcss.24.2.392-402","DOIUrl":"https://doi.org/10.15330/pcss.24.2.392-402","url":null,"abstract":"Spinel type nano ferrite compound MgFe2O4 was synthesized through sol gel technique using metal nitrates as precursors. The phase composition, morphology and elemental analysis of magnesium ferrite (MgFe2O4) were performed by X-ray diffraction, fourier transform infrared, atomic force microscopy, energy dispersive x-ray and scanning electron microscopy, analyses. \u0000The sample's X-ray diffraction pattern verifies the existence of single phase material, with the size of its crystallites estimated to be 39.9 nm. Fourier transform infrared examination supported metal-oxygen vibrations corresponding to tetrahedral and octahedral sites, respectively. From scanning electron microscopy image, grain size obtained about 97.7 nm. Raman spectra of the sample shows five Raman active modes (A1g + Eg + 3F2g), which is compatible with the spinel structure. Magnetic measurement study at room temperature shows a hysteresis loop behaviour with a low saturation magnetization value, 27.192 emu g-1 and a small coercivity value. The optical band gap determined using UV-visible transmittance spectra. Additionally, X-ray photoelectron spectroscopy are used to confirm oxidation states and explore the chemical composition of the sample.","PeriodicalId":20137,"journal":{"name":"Physics and Chemistry of Solid State","volume":"16 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2023-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81591328","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-29DOI: 10.15330/pcss.24.2.403-409
I. Budzulyak, L. Yablon, M. Khemii, V. Kotsyubynsky, B. Rachiy, R. Ilnytskyi, R. I. Kryvulych
It has been established that the doping of activated carbon material with chromium and manganese increases the specific capacitance of storage devices based on the charge-discharge mechanism of a double electric layer (DEL) by ~70 % and leads to a decrease in their internal resistance by 30-35 %. The main reason for this rise is the transformation of the electron energy spectrum due to an increase in the density of electronic states, as a result of which a much larger number of electrolyte ions (primarily positive ones) participate in the formation of DEL and cause an increase in the specific capacitance of these devices. It has been shown that laser irradiation stimulates the metal penetration into the bulk of carbon material.
{"title":"Stimulation of the metal doping process of nanoporous carbon material by laser irradiation","authors":"I. Budzulyak, L. Yablon, M. Khemii, V. Kotsyubynsky, B. Rachiy, R. Ilnytskyi, R. I. Kryvulych","doi":"10.15330/pcss.24.2.403-409","DOIUrl":"https://doi.org/10.15330/pcss.24.2.403-409","url":null,"abstract":"It has been established that the doping of activated carbon material with chromium and manganese increases the specific capacitance of storage devices based on the charge-discharge mechanism of a double electric layer (DEL) by ~70 % and leads to a decrease in their internal resistance by 30-35 %. The main reason for this rise is the transformation of the electron energy spectrum due to an increase in the density of electronic states, as a result of which a much larger number of electrolyte ions (primarily positive ones) participate in the formation of DEL and cause an increase in the specific capacitance of these devices. It has been shown that laser irradiation stimulates the metal penetration into the bulk of carbon material.","PeriodicalId":20137,"journal":{"name":"Physics and Chemistry of Solid State","volume":"66 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2023-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89165813","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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