Pub Date : 2023-12-22DOI: 10.15330/pcss.24.4.761-764
D.V. Gerasimenko, V.V. Tytarenko
Pulsed electrodeposition modes allowed to obtain amorphous Co-W alloys. Using X-ray phase and spectral analysis methods, it was established that the deposition modes and the concentration of the amorphizing component (sodium tungstate salts) in an aqueous electrolyte solution affect the amorphization of alloys. The short-range atomic order was studied by X-ray diffraction analysis and the sizes of the regions of ordered arrangement of atoms were determined in X-ray amorphous Co-W alloys obtained by pulsed electrodeposition. The radial distribution function of atoms was analysed. The assumption is made that cobalt and tungsten atoms combine into configurations that are irregular polyhedrons.
脉冲电沉积模式可获得非晶态 Co-W 合金。利用 X 射线相和光谱分析方法，确定了沉积模式和电解质水溶液中的非晶化成分（钨酸钠盐）浓度会影响合金的非晶化。通过 X 射线衍射分析研究了短程原子有序性，并确定了脉冲电沉积获得的 X 射线非晶 Co-W 合金中原子有序排列区域的大小。分析了原子的径向分布函数。假设钴原子和钨原子结合成不规则多面体构型。
{"title":"Study of the short-range order of Co-W alloys electrodeposited using pulse current","authors":"D.V. Gerasimenko, V.V. Tytarenko","doi":"10.15330/pcss.24.4.761-764","DOIUrl":"https://doi.org/10.15330/pcss.24.4.761-764","url":null,"abstract":"Pulsed electrodeposition modes allowed to obtain amorphous Co-W alloys. Using X-ray phase and spectral analysis methods, it was established that the deposition modes and the concentration of the amorphizing component (sodium tungstate salts) in an aqueous electrolyte solution affect the amorphization of alloys. The short-range atomic order was studied by X-ray diffraction analysis and the sizes of the regions of ordered arrangement of atoms were determined in X-ray amorphous Co-W alloys obtained by pulsed electrodeposition. The radial distribution function of atoms was analysed. The assumption is made that cobalt and tungsten atoms combine into configurations that are irregular polyhedrons.","PeriodicalId":20137,"journal":{"name":"Physics and Chemistry of Solid State","volume":"7 10","pages":""},"PeriodicalIF":0.7,"publicationDate":"2023-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138944535","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 : 2023-12-21DOI: 10.15330/pcss.24.4.748-760
N. Danyliuk, I. Lapchuk, V. Kotsyubynsky, V. Boychuk, Viktor Husak
Mn-substituted magnetite samples Fe3-xMnxO4 (x = 0.0; 0.02; 0.05; 0.1; 0.15; 0.2; 0.25) were synthesized using the co-precipitation method. X-ray diffraction patterns confirmed the formation of pure, well-crystallized manganese ferrite with a cubic spinel structure. The crystallites size increases sharply for the minimum degrees of substitution, with a subsequent tendency to decrease with the growth of manganese ions content. The catalytic properties of Fe3-xMnxO4 were investigated for the degradation of oxytetracycline (ОТС) and inactivate E. coli. There is a correlation between particle size and catalytic activity. The Fe2.95Mn0.05O4 sample exhibited the highest catalytic activity in the destruction of OTC. The effect of electromagnetic heating (EMH) on the catalytic properties of iron oxides were investigated. The Fe2.9Mn0.1O4 sample with electromagnetic heating achieved 100 % efficiency in decomposing 5 mg/L of OTC. Fe3-xMnxO4 samples reduce the number of Gram-negative bacteria E. coli at concentrations of 104 and 106 CFU/mL. Electromagnetic heating experiments demonstrated high performance, achieving inactivation of 6 logs of E. coli in the presence of Fe2.98Mn0.02O4 and Fe2.95Mn0.05O4 catalysts within 135 minutes. Studies on ecotoxicity have shown that Daphnia magna is a sensitive bioindicator of residual H2O2 concentration. An increase in the Mn2+ content in the synthesized catalysts resulted in a decrease in the toxicity of purified water. The study suggests that Mn-substituted magnetite catalysts are effective materials for catalytic decomposition of OTC and inactivation of E. coli bacteria.
{"title":"Effect of Mn2+ substitution on catalytic properties of Fe3-xMnxO4 nanoparticles synthesized via co-precipitation method","authors":"N. Danyliuk, I. Lapchuk, V. Kotsyubynsky, V. Boychuk, Viktor Husak","doi":"10.15330/pcss.24.4.748-760","DOIUrl":"https://doi.org/10.15330/pcss.24.4.748-760","url":null,"abstract":"Mn-substituted magnetite samples Fe3-xMnxO4 (x = 0.0; 0.02; 0.05; 0.1; 0.15; 0.2; 0.25) were synthesized using the co-precipitation method. X-ray diffraction patterns confirmed the formation of pure, well-crystallized manganese ferrite with a cubic spinel structure. The crystallites size increases sharply for the minimum degrees of substitution, with a subsequent tendency to decrease with the growth of manganese ions content. The catalytic properties of Fe3-xMnxO4 were investigated for the degradation of oxytetracycline (ОТС) and inactivate E. coli. There is a correlation between particle size and catalytic activity. The Fe2.95Mn0.05O4 sample exhibited the highest catalytic activity in the destruction of OTC. The effect of electromagnetic heating (EMH) on the catalytic properties of iron oxides were investigated. The Fe2.9Mn0.1O4 sample with electromagnetic heating achieved 100 % efficiency in decomposing 5 mg/L of OTC. Fe3-xMnxO4 samples reduce the number of Gram-negative bacteria E. coli at concentrations of 104 and 106 CFU/mL. Electromagnetic heating experiments demonstrated high performance, achieving inactivation of 6 logs of E. coli in the presence of Fe2.98Mn0.02O4 and Fe2.95Mn0.05O4 catalysts within 135 minutes. Studies on ecotoxicity have shown that Daphnia magna is a sensitive bioindicator of residual H2O2 concentration. An increase in the Mn2+ content in the synthesized catalysts resulted in a decrease in the toxicity of purified water. The study suggests that Mn-substituted magnetite catalysts are effective materials for catalytic decomposition of OTC and inactivation of E. coli bacteria.","PeriodicalId":20137,"journal":{"name":"Physics and Chemistry of Solid State","volume":"35 19","pages":""},"PeriodicalIF":0.7,"publicationDate":"2023-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138948904","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 : 2023-12-21DOI: 10.15330/pcss.24.4.735-741
A.H. Mandryka, O. O. Pasenko, V. H. Vereschak, Y. Osokin
In the work using the quantum-chemical modeling method, the possibility of binding orthosilicate acid with different amounts of methanesulfonate anions was considered. It was demonstrated that methanesulfonic acid forms two hydrogen bonds with a molecule of orthosilicate acid, regardless of the conformation of the cluster itself. According to the results of calculations of energy parameters of systems and frontier molecular orbitals, it was established that the most stable cluster of orthosilicate acid with methanesulfonate anion is [H4SiO4 · 4CH3SO3–]. It was also established that the formation of an eight-membered cycle (S–O···H–O–Si–O–H···O) and (S–O···H –O–Si–O···H–С). Furthermore, it was established that there is no significant dependence of the effective charge on the silicon atom on the number of methanesulfonate anions in the inner sphere. Thus, it is theoretically demonstrated that the methanesulfonate anion is able to stabilize orthosilicate acid and reduce the possibility of its dimerization.
{"title":"Modeling of orthosilicate and methanesulfonic acid clusters in aqueous solution","authors":"A.H. Mandryka, O. O. Pasenko, V. H. Vereschak, Y. Osokin","doi":"10.15330/pcss.24.4.735-741","DOIUrl":"https://doi.org/10.15330/pcss.24.4.735-741","url":null,"abstract":"In the work using the quantum-chemical modeling method, the possibility of binding orthosilicate acid with different amounts of methanesulfonate anions was considered. It was demonstrated that methanesulfonic acid forms two hydrogen bonds with a molecule of orthosilicate acid, regardless of the conformation of the cluster itself. According to the results of calculations of energy parameters of systems and frontier molecular orbitals, it was established that the most stable cluster of orthosilicate acid with methanesulfonate anion is [H4SiO4 · 4CH3SO3–]. It was also established that the formation of an eight-membered cycle (S–O···H–O–Si–O–H···O) and (S–O···H –O–Si–O···H–С). Furthermore, it was established that there is no significant dependence of the effective charge on the silicon atom on the number of methanesulfonate anions in the inner sphere. Thus, it is theoretically demonstrated that the methanesulfonate anion is able to stabilize orthosilicate acid and reduce the possibility of its dimerization.","PeriodicalId":20137,"journal":{"name":"Physics and Chemistry of Solid State","volume":"55 6","pages":""},"PeriodicalIF":0.7,"publicationDate":"2023-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138949766","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 : 2023-12-21DOI: 10.15330/pcss.24.4.742-747
Y. Titov, N. Belyavina, M. Slobodyanik, O. Nakonechna, N. Strutynska, V. Chumak
Tetragonal crystal structure (space group P42/mnm (No 136)) of the isovalently substituted BaGd2Sc2-xInxO7 phase with x = 0.5 was determined by X-ray powder diffraction methods. The crystal structure of BaGd2Sc1.5In0.5O7 consists of two-dimensional perovskite-like blocks with a thickness of two slabs of (Sc,In)O6 octahedra connected by vertices. A slab of GdO9 polyhedra is located between the blocks. There are no direct (Sc,In) – O – (Sc,In) connections between the octahedra of adjacent blocks. They are "stitched" to each other with the help of – O – Gd – O – bonds. Ba atoms are arranged only in the cubooctahedral voids of the perovskite-like block and their coordination number is 12. Analysis of the crystal chemical characteristics of BaGd2Sc2O7 and BaGd2Sc1.5In0.5O7 showed that upon the isovalent substitution of Sc atoms by large In atoms in slab perovskite-like structure leads to increase of the deformation degree of (Sc,In)O6 octahedra, GdO9 interblock polyhedra, increase in average (Sc,In) – O bond length and a decrease the degree deformation of BaO12 cuboctahedrons. Such changes lead to the destabilization of the slab perovskite-like structure and determine the limitation of the area of BaGd2Sc2-xInxO7 solid solutions and the absence of BaGd2In2O7 compound.
通过 X 射线粉末衍射方法确定了 x = 0.5 的异价取代 BaGd2Sc2-xInxO7 相的四方晶体结构（空间群 P42/mnm（No 136））。BaGd2Sc1.5In0.5O7 的晶体结构由二维透辉石样块组成，其厚度为两块由顶点连接的 (Sc,In)O6 八面体板。块体之间有一块 GdO9 多面体板。相邻块体的八面体之间没有直接的 (Sc,In) - O - (Sc,In) 连接。它们是通过 - O - Gd - O - 键相互 "缝合 "在一起的。钡原子只分布在类包晶块的立方八面体空隙中，其配位数为 12。对 BaGd2Sc2O7 和 BaGd2Sc1.5In0.5O7 晶体化学特性的分析表明，板状包晶结构中的大 In 原子等价取代 Sc 原子后，(Sc,In)O6 八面体和 GdO9 块间多面体的变形程度增加，(Sc,In) - O 键的平均长度增加，BaO12 立方体的变形程度降低。这些变化导致了板状透辉石样结构的不稳定性，并决定了 BaGd2Sc2-xInxO7 固溶体面积的限制和 BaGd2In2O7 化合物的缺失。
{"title":"Effect of scandium atoms substitution on the two-slab structure of scandate BaGd2Sc2O7","authors":"Y. Titov, N. Belyavina, M. Slobodyanik, O. Nakonechna, N. Strutynska, V. Chumak","doi":"10.15330/pcss.24.4.742-747","DOIUrl":"https://doi.org/10.15330/pcss.24.4.742-747","url":null,"abstract":"Tetragonal crystal structure (space group P42/mnm (No 136)) of the isovalently substituted BaGd2Sc2-xInxO7 phase with x = 0.5 was determined by X-ray powder diffraction methods. The crystal structure of BaGd2Sc1.5In0.5O7 consists of two-dimensional perovskite-like blocks with a thickness of two slabs of (Sc,In)O6 octahedra connected by vertices. A slab of GdO9 polyhedra is located between the blocks. There are no direct (Sc,In) – O – (Sc,In) connections between the octahedra of adjacent blocks. They are \"stitched\" to each other with the help of – O – Gd – O – bonds. Ba atoms are arranged only in the cubooctahedral voids of the perovskite-like block and their coordination number is 12. Analysis of the crystal chemical characteristics of BaGd2Sc2O7 and BaGd2Sc1.5In0.5O7 showed that upon the isovalent substitution of Sc atoms by large In atoms in slab perovskite-like structure leads to increase of the deformation degree of (Sc,In)O6 octahedra, GdO9 interblock polyhedra, increase in average (Sc,In) – O bond length and a decrease the degree deformation of BaO12 cuboctahedrons. Such changes lead to the destabilization of the slab perovskite-like structure and determine the limitation of the area of BaGd2Sc2-xInxO7 solid solutions and the absence of BaGd2In2O7 compound.","PeriodicalId":20137,"journal":{"name":"Physics and Chemistry of Solid State","volume":"44 9","pages":""},"PeriodicalIF":0.7,"publicationDate":"2023-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138952520","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 work developed circuit engineering, design and software of the loading machine for automated examination of dental hard tissue defects after endodontics intervention for fatigue and destruction. The advantage of this development is the combination as cyclic loading methods simulating chewing movements and force effects on compression in a compact small-sized case, with low power consumption and small noise level. Thanks to the use of a screw transmission and a stepper motor in combination with a sensitive tensoresistive force sensor, it was possible to achieve high accuracy and resolution of 0.1 microns. A series of tests was conducted on real samples of endodontically treated teeth restored using fiberglass pins and cast metal stump inserts. It is shown that methods of restoring incisors and premolars of the upper jaw with the help of fiberglass pins have an advantage when the residual structure of the tooth is lacking due to a more uniform distribution of deformation stresses, since their elastic modulus is close to the elastic modulus of dentin.
{"title":"Hardware and software for automated examination of defects of hard tissues of teeth after endodontic intervention for fatigue and destruction","authors":"B.S. Dzundza, Y. Yavorsky, V.V. Fedoryuk, M.M. Rozhko, U.M. Pisklynets, O.I. Bulbuk","doi":"10.15330/pcss.24.4.722-728","DOIUrl":"https://doi.org/10.15330/pcss.24.4.722-728","url":null,"abstract":"The work developed circuit engineering, design and software of the loading machine for automated examination of dental hard tissue defects after endodontics intervention for fatigue and destruction. The advantage of this development is the combination as cyclic loading methods simulating chewing movements and force effects on compression in a compact small-sized case, with low power consumption and small noise level. Thanks to the use of a screw transmission and a stepper motor in combination with a sensitive tensoresistive force sensor, it was possible to achieve high accuracy and resolution of 0.1 microns. \u0000A series of tests was conducted on real samples of endodontically treated teeth restored using fiberglass pins and cast metal stump inserts. It is shown that methods of restoring incisors and premolars of the upper jaw with the help of fiberglass pins have an advantage when the residual structure of the tooth is lacking due to a more uniform distribution of deformation stresses, since their elastic modulus is close to the elastic modulus of dentin.","PeriodicalId":20137,"journal":{"name":"Physics and Chemistry of Solid State","volume":"20 2","pages":""},"PeriodicalIF":0.7,"publicationDate":"2023-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138949325","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 : 2023-12-21DOI: 10.15330/pcss.24.4.729-734
C. Zenkova, O. Angelsky, D. Ivanskyi, M. M. Chumak
Proposed paper presents the latest results in the framework of polarization-sensitive low-coherence interferometry related to new approaches for using the geometric phase to reproduce the polarization structure of a biological transparent anisotropic micro (nano) object. The polarization parameters of an anisotropic object are measured in real time on the basis of a modified Mach-Zehnder interferometer. The advantage of using the geometric phase is the diagnostic of polarization anisotropic surface (subsurface) nanosized layers in a non-contact, non-invasive manner.
{"title":"Geometric phase for investigation of nanostructures in approaches of polarization-sensitive optical coherence tomography","authors":"C. Zenkova, O. Angelsky, D. Ivanskyi, M. M. Chumak","doi":"10.15330/pcss.24.4.729-734","DOIUrl":"https://doi.org/10.15330/pcss.24.4.729-734","url":null,"abstract":"Proposed paper presents the latest results in the framework of polarization-sensitive low-coherence interferometry related to new approaches for using the geometric phase to reproduce the polarization structure of a biological transparent anisotropic micro (nano) object. The polarization parameters of an anisotropic object are measured in real time on the basis of a modified Mach-Zehnder interferometer. The advantage of using the geometric phase is the diagnostic of polarization anisotropic surface (subsurface) nanosized layers in a non-contact, non-invasive manner.","PeriodicalId":20137,"journal":{"name":"Physics and Chemistry of Solid State","volume":"29 6","pages":""},"PeriodicalIF":0.7,"publicationDate":"2023-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138951754","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 : 2023-12-17DOI: 10.15330/pcss.24.4.714-721
D. K. Dash, P. Patnaik, S.K. Nayak, M. Barala
Applying the principle of Density functional theory, we can calculate various parameters like lattice constant, band gap, band plot, dielectric function plot, refractive index plot, conductivity plot, density of state plot, loss function etc. of GaN. In this work, we use different electronic pseudopotentials with different relativistic treatment studied using Local density approximation functional (LDA-CAPZ) within DFT for GaN. We used to calculate the energy values, lattice parameters change after geometry optimisation and plot the band energies. Electronic structure calculations results are compares taking different electronic pseudopotentials of different cut-off energy having different relativistic approaches. The Density of state plot and partial density of states plot help to studied more about the electronic as well as magnetic characteristics of the GaN sample. Here, we also compare the advantages and disadvantages of different pseudopotentials with different relativistic approaches of the sample. Energy level distribution and partial density of states were compared for all the pseudopotentials with different relativistic treatments, providing insight into the orbital contributions of electrons to the density of levels. Our study provides a deeper understanding into the impact of electronic pseudopotentials and relativistic treatments on the electronic and structural properties of GaN.
应用密度泛函理论的原理，我们可以计算出 GaN 的各种参数，如晶格常数、带隙、带图、介电常数图、折射率图、电导率图、状态密度图、损耗函数等。在这项工作中，我们使用了不同的电子伪势和不同的相对论处理方法，并使用 DFT 中的局部密度近似函数（LDA-CAPZ）对氮化镓进行了研究。我们计算了能值、几何优化后晶格参数的变化，并绘制了能带图。电子结构计算结果采用不同的电子伪势和不同的相对论方法计算得出。状态密度图和部分状态密度图有助于进一步研究氮化镓样品的电子和磁特性。在此，我们还比较了样品采用不同相对论方法的不同伪势的优缺点。我们比较了不同相对论处理的所有伪势的能级分布和部分态密度，从而深入了解了电子对能级密度的轨道贡献。我们的研究加深了人们对电子伪势和相对论处理对氮化镓的电子和结构特性的影响的理解。
{"title":"Assessing the Effect of Electronic Pseudopotentials and Relativistic Treatments on the Structural and Electrical Properties of GaN: A DFT Study","authors":"D. K. Dash, P. Patnaik, S.K. Nayak, M. Barala","doi":"10.15330/pcss.24.4.714-721","DOIUrl":"https://doi.org/10.15330/pcss.24.4.714-721","url":null,"abstract":"Applying the principle of Density functional theory, we can calculate various parameters like lattice constant, band gap, band plot, dielectric function plot, refractive index plot, conductivity plot, density of state plot, loss function etc. of GaN. In this work, we use different electronic pseudopotentials with different relativistic treatment studied using Local density approximation functional (LDA-CAPZ) within DFT for GaN. We used to calculate the energy values, lattice parameters change after geometry optimisation and plot the band energies. Electronic structure calculations results are compares taking different electronic pseudopotentials of different cut-off energy having different relativistic approaches. The Density of state plot and partial density of states plot help to studied more about the electronic as well as magnetic characteristics of the GaN sample. Here, we also compare the advantages and disadvantages of different pseudopotentials with different relativistic approaches of the sample. Energy level distribution and partial density of states were compared for all the pseudopotentials with different relativistic treatments, providing insight into the orbital contributions of electrons to the density of levels. Our study provides a deeper understanding into the impact of electronic pseudopotentials and relativistic treatments on the electronic and structural properties of GaN.","PeriodicalId":20137,"journal":{"name":"Physics and Chemistry of Solid State","volume":"23 12","pages":""},"PeriodicalIF":0.7,"publicationDate":"2023-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138965833","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 : 2023-12-16DOI: 10.15330/pcss.24.4.699-706
M. Moroz, P. Demchenko, F. Tesfaye, M. Prokhorenko, S. Prokhorenko, O. Reshetnyak
Equilibrium T–x space of the Ag–Ga–Te system in the GaTe–AgGa5Te8–Te part was divided below 600 K into three-phase regions Ga2Te5–AgGa5Te8–Te, Ga2Te3–AgGa5Te8–Ga2Te5, Ga7Te10–AgGa5Te8–Ga2Te3, Ga3Te4–AgGa5Te8–Ga7Te10, and GaTe–AgGa5Te8–Ga3Te4 by the electromotive force (EMF) method. To accomplish accurate experimental data, the following electrochemical cells (ECs) were assembled: (−)IE|NE|SSЕ|R{Ag+}|PЕ|IE(+), where IE is the inert electrode (graphite powder), NE is the negative electrode (silver powder), SSE is the solid-state electrolyte (glassy Ag3GeS3Br), PE is the positive electrode, R{Ag+} is the region of PE that contact with SSE. At the stage of cell preparation, PE is a nonequilibrium phase mixture of the well-mixed powdered compounds Ag2Te, GaTe, Ga2Te3, and tellurium, taken in ratios corresponding to two or three different points in each of the mentioned regions. The equilibrium set of phases was formed in the R{Ag+} region at 600 K for 48 h with the participation of the Ag+ ions. Silver cations, displaced for thermodynamic reasons from the NE to the PE of the ECs, acted as catalyst, i.e., small nucleation centers of equilibrium phases. The spatial position of the established three-phase regions relative to the silver point was used to assign the overall potential-determining reactions of synthesis of the ternary AgGa5Te8 and binary Ga2Te5, Ga7Te10, Ga3Te4 compounds. For the first time, the values of the standard thermodynamic functions (Gibbs energies, enthalpies, and entropies) of these compounds were determined based on the temperature dependences of the EMF of the ECs.
{"title":"Experimental investigation and thermodynamic assessment of phase equilibria in the GaTe–AgGa5Te8–Te system below 600 K","authors":"M. Moroz, P. Demchenko, F. Tesfaye, M. Prokhorenko, S. Prokhorenko, O. Reshetnyak","doi":"10.15330/pcss.24.4.699-706","DOIUrl":"https://doi.org/10.15330/pcss.24.4.699-706","url":null,"abstract":"Equilibrium T–x space of the Ag–Ga–Te system in the GaTe–AgGa5Te8–Te part was divided below 600 K into three-phase regions Ga2Te5–AgGa5Te8–Te, Ga2Te3–AgGa5Te8–Ga2Te5, Ga7Te10–AgGa5Te8–Ga2Te3, Ga3Te4–AgGa5Te8–Ga7Te10, and GaTe–AgGa5Te8–Ga3Te4 by the electromotive force (EMF) method. To accomplish accurate experimental data, the following electrochemical cells (ECs) were assembled: (−)IE|NE|SSЕ|R{Ag+}|PЕ|IE(+), where IE is the inert electrode (graphite powder), NE is the negative electrode (silver powder), SSE is the solid-state electrolyte (glassy Ag3GeS3Br), PE is the positive electrode, R{Ag+} is the region of PE that contact with SSE. At the stage of cell preparation, PE is a nonequilibrium phase mixture of the well-mixed powdered compounds Ag2Te, GaTe, Ga2Te3, and tellurium, taken in ratios corresponding to two or three different points in each of the mentioned regions. The equilibrium set of phases was formed in the R{Ag+} region at 600 K for 48 h with the participation of the Ag+ ions. Silver cations, displaced for thermodynamic reasons from the NE to the PE of the ECs, acted as catalyst, i.e., small nucleation centers of equilibrium phases. The spatial position of the established three-phase regions relative to the silver point was used to assign the overall potential-determining reactions of synthesis of the ternary AgGa5Te8 and binary Ga2Te5, Ga7Te10, Ga3Te4 compounds. For the first time, the values of the standard thermodynamic functions (Gibbs energies, enthalpies, and entropies) of these compounds were determined based on the temperature dependences of the EMF of the ECs.","PeriodicalId":20137,"journal":{"name":"Physics and Chemistry of Solid State","volume":"66 12","pages":""},"PeriodicalIF":0.7,"publicationDate":"2023-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138967645","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 : 2023-12-16DOI: 10.15330/pcss.24.4.692-698
R.I.S. Asri, B. Sunendar, I. Dwiandhono, A. Harmaji
This study aimed to synthesize fillers in the form of alumina-zirconia-carbonate apatite and pineapple leaf fiber (Ananas comosus (L.) Merr) as matrix reinforcement consisting of UDMA, TEGDMA, and DMAEMA for direct dental restoration applications. The sample consisted of four composite groups with the addition of 0-5% fiber. All composite samples were then tested for hardness, flexural strength, and Scanning Electron Microscope (SEM). The results of the composite hardness test without the addition of fiber were 30.31 VHN. With the addition of 1%, 2.5%, and 5% fiber, the composite has a hardness value of 31.13 VHN, 34.02 VHN, and 27.22 VHN, respectively. The results of the three-point bending test showed that the flexural strength of the sample without the addition of fiber was 1.6 MPa, while the addition of 1%, 2.5%, and 5% fiber resulted in the flexural strength of 2.1 MPa, 2.3 MPa, and 1.8 MPa, respectively. The SEM results show a homogeneous particle dispersion morphology, with various agglomerations and gaps. Composites with the addition of 1% and 2.5% fiber have a narrower gap than without the addition of fiber. This explains the increase in the hardness and flexural strength of the composite.
{"title":"Properties of Metal Oxide and Pineapple Fiber Reinforced Dental Composite Resin","authors":"R.I.S. Asri, B. Sunendar, I. Dwiandhono, A. Harmaji","doi":"10.15330/pcss.24.4.692-698","DOIUrl":"https://doi.org/10.15330/pcss.24.4.692-698","url":null,"abstract":"This study aimed to synthesize fillers in the form of alumina-zirconia-carbonate apatite and pineapple leaf fiber (Ananas comosus (L.) Merr) as matrix reinforcement consisting of UDMA, TEGDMA, and DMAEMA for direct dental restoration applications. The sample consisted of four composite groups with the addition of 0-5% fiber. All composite samples were then tested for hardness, flexural strength, and Scanning Electron Microscope (SEM). The results of the composite hardness test without the addition of fiber were 30.31 VHN. With the addition of 1%, 2.5%, and 5% fiber, the composite has a hardness value of 31.13 VHN, 34.02 VHN, and 27.22 VHN, respectively. The results of the three-point bending test showed that the flexural strength of the sample without the addition of fiber was 1.6 MPa, while the addition of 1%, 2.5%, and 5% fiber resulted in the flexural strength of 2.1 MPa, 2.3 MPa, and 1.8 MPa, respectively. The SEM results show a homogeneous particle dispersion morphology, with various agglomerations and gaps. Composites with the addition of 1% and 2.5% fiber have a narrower gap than without the addition of fiber. This explains the increase in the hardness and flexural strength of the composite.","PeriodicalId":20137,"journal":{"name":"Physics and Chemistry of Solid State","volume":"55 3","pages":""},"PeriodicalIF":0.7,"publicationDate":"2023-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138967750","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 : 2023-12-16DOI: 10.15330/pcss.24.4.707-713
Yu. G. Chabak, М.А. Golinskyi, V. Efremenko, H. Halfa, V. Zurnadzhy, B. Efremenko, E. V. Tsvetkova, A. V. Dzherenova
In the article, the characterization of the morphology, chemical composition, and elemental distribution in the Ti-based carboboride M(C,B) in (wt.%) Fe-0.72C-2.75B-5.05W-5.57Mo-10.35Cr-2.60Ti multi-component alloy is fulfilled. The study was performed using optical microscopy, SEM, TEM, and energy-dispersive X-ray spectroscopy. It was found that the carboboride M(C,B) is present in the structure in the form of the equiaxed polygonal particles of a 0.5-7.3 mm mean size. The particles are divided into “duplex” and “uniform” ones. The duplex particles consists of the Ti-rich (75 wt. % Ti) “core” (Ti(C,B)) and the Ti-depleted (47.3 wt. % Ti) “shell” ((Ti,W,Mo,V)(C,B)). The uniform particles are characterized by an even distribution of the elements having a chemical composition close to the “shell”. The ratio of B:C (at. %) is 1:2.5, 1:3.3, and 1:3.2 for the “core”, “shell” and the uniform particle respectively. The chemical formulas of the duplex/uniform M(C,B) inclusions and the mechanism of their formation are proposed.
{"title":"Ti-rich carboborides in the multi-component high-boron alloy: morphology and elemental distribution","authors":"Yu. G. Chabak, М.А. Golinskyi, V. Efremenko, H. Halfa, V. Zurnadzhy, B. Efremenko, E. V. Tsvetkova, A. V. Dzherenova","doi":"10.15330/pcss.24.4.707-713","DOIUrl":"https://doi.org/10.15330/pcss.24.4.707-713","url":null,"abstract":"In the article, the characterization of the morphology, chemical composition, and elemental distribution in the Ti-based carboboride M(C,B) in (wt.%) Fe-0.72C-2.75B-5.05W-5.57Mo-10.35Cr-2.60Ti multi-component alloy is fulfilled. The study was performed using optical microscopy, SEM, TEM, and energy-dispersive X-ray spectroscopy. It was found that the carboboride M(C,B) is present in the structure in the form of the equiaxed polygonal particles of a 0.5-7.3 mm mean size. The particles are divided into “duplex” and “uniform” ones. The duplex particles consists of the Ti-rich (75 wt. % Ti) “core” (Ti(C,B)) and the Ti-depleted (47.3 wt. % Ti) “shell” ((Ti,W,Mo,V)(C,B)). The uniform particles are characterized by an even distribution of the elements having a chemical composition close to the “shell”. The ratio of B:C (at. %) is 1:2.5, 1:3.3, and 1:3.2 for the “core”, “shell” and the uniform particle respectively. The chemical formulas of the duplex/uniform M(C,B) inclusions and the mechanism of their formation are proposed.","PeriodicalId":20137,"journal":{"name":"Physics and Chemistry of Solid State","volume":"44 2","pages":""},"PeriodicalIF":0.7,"publicationDate":"2023-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138967755","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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