Glass Physics and Chemistry最新文献

{"title":"Thermal Behavior of Perovskite-Like Phases in the GdAlO3–SrO System","authors":"V. F. Popova,&nbsp;E. A. Tugova","doi":"10.1134/S1087659624600248","DOIUrl":"10.1134/S1087659624600248","url":null,"abstract":"<p>The results of a study of the GdAlO₃–SrO section, which is one of the internal sections of the Gd₂O₃–SrO–Al₂O₃ ternary system, are presented. In the GdAlO₃–SrO section three triple compounds, Gd₂SrAl₂O₇, GdSrAlO₄, and GdSr₂AlO₅, crystallizing in the tetragonal system, are synthesized. The data on the mechanism of their solid-phase formation are systematized. The results of the thermal stability of perovskite-like phases in the GdAlO₃–SrO system are presented in a wide temperature range of 1100–1800°C in air. The congruent character of the melting of Gd₂SrAl₂O₇, GdSrAlO₄, and GdSr₂AlO₅ complex oxides is established and their melting temperatures are determined.</p>","PeriodicalId":580,"journal":{"name":"Glass Physics and Chemistry","volume":"50 2","pages":"174 - 178"},"PeriodicalIF":0.8,"publicationDate":"2024-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142413800","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Cluster Self-Organization of Intermetallic Systems: Clusters-Precursors K3, K4, and K6 for the Self-Assembly of RbNa8Ga3As6-oP72, Sr2Ca4In3Ge6-oP56, and Sr8Li4In4Ge8-oP24 Crystal Structures","authors":"V. Ya. Shevchenko,&nbsp;G. D. Ilyushin","doi":"10.1134/S1087659624600273","DOIUrl":"10.1134/S1087659624600273","url":null,"abstract":"<p>Using computer methods (the ToposPro software package), combinatorial-topological analysis and modeling of self-assembly of the following crystal structures are carried out: <b>RbNa</b>_<b>8</b><b>Ga</b>_<b>3</b><b>As</b>_<b>6</b><b>-</b><b><i>oP</i></b><b>72</b> (<i>a</i> = 22.843Å, <i>b</i> = 4.789 <i>c</i> = 16.861 Å, <i>V</i> = 1844.6 ų, <i>Pnma</i>), <b>Sr</b>_<b>2</b><b>Ca</b>_<b>4</b><b>In</b>_<b>3</b><b>Ge</b>_<b>6</b><b>-</b><b><i>oP</i></b><b>56</b> (<i>a</i> = 13.243 Å, <i>b</i> = 4.460 Å, <i>c</i> = 23.505 Å, <i>V</i> = 1388.47 ų, <i>Pnma</i>), and <b>Sr</b>_<b>8</b><b>Li</b>_<b>4</b><b>In4Ge</b>_<b>8</b><b>-</b><b><i>oP</i></b><b>24</b> (<i>a</i> = 7.503 Å, <i>b</i> = 4.619 Å, <i>c</i> = 17.473 Å, <i>V</i> = 605.6 ų, <i>Pnma</i>). For the <b>RbNa</b>_<b>8</b><b>Ga</b>_<b>3</b><b>As</b>_<b>6</b><b>-</b><b><i>oP</i></b><b>72</b> crystal structure, 93 variants of a cluster representation of a 3D atomic mesh with the number of structural units of 3, 4, and 6 are established. A variant of self-assembly involving three types of clusters-precursors is considered: double tetrahedra K6(4a) = 0@6 (Rb₂Na₂As₂) and K6(4b) = 0@6 (Na₄As₂) with symmetry <i>g</i> = –1, tetrahedron K4(8d) = 0@4(Na₃As), two triple rings K3-1 = 0@3(NaGaAs), and Ga and As spacer atoms. For the <b>Sr</b>_<b>2</b><b>Ca</b>_<b>4</b><b>In</b>_<b>3</b><b>Ge</b>_<b>6</b><b>-</b><b><i>oP</i></b><b>56</b> crystal structure, 43 variants of a cluster representation of a 3D atomic mesh with the number of structural units of 3, 4, and 6 are established. A variant of self-assembly of a crystal structure involving three types of clusters-precursors from double tetrahedra K6(4a) = 0@6 (Sr) ₂In₂Ge₂) and K6(4b) = 0@6 (Ca₂In₂Ge₂) with symmetry g = –1, double tetrahedra K6(4c) = 0@6 (SrCa₂InGe₂), and Ge2 and Ge4 spacer atoms is considered. For the <b>Sr</b>_<b>8</b><b>Li</b>_<b>4</b><b>In4Ge</b>_<b>8</b><b>-</b><b><i>oP</i></b><b>24</b> crystal structure, three variants of a cluster representation of a 3D atomic mesh with two structural units are established. A variant of the self-assembly of a crystal structure involving two types of clusters-precursors in the form of double tetrahedra K6 = (Sr₂Li₂Ge₂) with symmetry <i>g</i> = –1 and triple rings <i>K</i>3 = 0@3 (SrInGe) is considered. The symmetry and topological code of the processes of self-assembly of 3D structures from clusters-precursors are reconstructed in the following form: primary chain → layer → framework.</p>","PeriodicalId":580,"journal":{"name":"Glass Physics and Chemistry","volume":"50 2","pages":"87 - 100"},"PeriodicalIF":0.8,"publicationDate":"2024-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142413717","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Gibbsite Decomposition from Aluminate Solutions in Low-Intensity Ultrasonic Fields","authors":"D. V. Zarembo,&nbsp;A. A. Kolesnikov,&nbsp;V. I. Zarembo","doi":"10.1134/S1087659623310012","DOIUrl":"10.1134/S1087659623310012","url":null,"abstract":"<p>The results of laboratory studies of the practical application of the reagent-free method of tensor-pulse regulation in the industrial method for obtaining gibbsite from aluminate solutions by the Bayer method are presented. During decomposition in regulatory regimes, the size and homogeneity of crystals increase, and an increase in the rate of dissolution of the seed and crystallization of gibbsite is observed. The quantitative characteristics of the degree of transformations are given and the parameters of gibbsite crystals obtained by the traditional method and in different regulation modes are determined. The results of the X-ray phase study and granulometric analysis of images obtained with a scanning electron microscope are described.</p>","PeriodicalId":580,"journal":{"name":"Glass Physics and Chemistry","volume":"49 1","pages":"81 - 86"},"PeriodicalIF":0.8,"publicationDate":"2024-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142410564","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of the Elemental Composition of Optical Glasses on the Quantitative Characteristics of X-Ray and Gamma Radiation Attenuation","authors":"V. I. Arbuzov","doi":"10.1134/S1087659624600078","DOIUrl":"10.1134/S1087659624600078","url":null,"abstract":"<p>The influence of chemical elements in the composition of optical glasses on the quantitative characteristics of their attenuation of X-ray and gamma radiation is analyzed. The method of calculating the mass coefficients of radiation attenuation (MCRA) with quantum energy ranging from 0.2 to 3.0 MeV for oxides as glass components is proposed. The chemical elements and their oxides in the glass composition, which make the main contribution to their values of the linear coefficient of radiation attenuation (LCRA) with different quantum energies, <i>E</i>, are identified. In the field of quantum energies ranging from 0.2 to about 1.0 MeV, oxides such as PbO, Ta₂O₅, Gd₂O₃, La₂O₃, BaO, Sb₂O₃ (due to its low concentration, its contribution to LCRA is usually negligible), CdO, Nb₂O₅, ZrO₂, and Y₂O₃ have a strong effect (in decreasing order) on the LCRA values of glasses. It is shown that in the field of <i>E</i> values ranging from 0.2 to about 1.0 MeV, elements (or their oxides) can be very different from each other in terms of their MCRA values, and glasses of different compositions, in terms of their LCRA values, while at <i>E</i> &gt; 1.0 MeV, both the first and second coefficients change approximately equally with an increase in the energy of radiation quanta.</p>","PeriodicalId":580,"journal":{"name":"Glass Physics and Chemistry","volume":"50 1","pages":"10 - 16"},"PeriodicalIF":0.8,"publicationDate":"2024-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141519221","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Thermally Induced Reversible Changes in the 7200 cm–1 Absorption Band in a Fiber Light Guide with a High Concentration of OH Groups in the Core","authors":"P. I. Gnusin","doi":"10.1134/S1087659623601223","DOIUrl":"10.1134/S1087659623601223","url":null,"abstract":"<p>For a multimode optical fiber, whose core is formed by quartz glass of the KU-1 type with a high content of hydroxyl groups, the dynamics of the reversible (recoverable) change in the optical absorption of these groups near 7200 cm^–1 when the light guide is heated to 1050°C, are studied. Based on the decomposition of the absorption band into spectral components at different temperatures, assumptions are made regarding the structure of absorption centers related to the OH groups.</p>","PeriodicalId":580,"journal":{"name":"Glass Physics and Chemistry","volume":"50 1","pages":"47 - 54"},"PeriodicalIF":0.8,"publicationDate":"2024-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141519225","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Cluster Self-Organization of Intermetallic Systems: Cluster-Precursors K13, K11, K4, and K3 for the Self-Assembly of Crystal Structures Ce56Ni24Si44-mS124 and Ba10La2Si12-oP48","authors":"V. Ya. Shevchenko,&nbsp;G. D. Ilyushin","doi":"10.1134/S1087659624600066","DOIUrl":"10.1134/S1087659624600066","url":null,"abstract":"<p>Using computer methods (the ToposPro software package), a combinatorial topological analysis and modeling of the self-assembly of crystal structures of Ce₅₆Ni₂₄Si₄₄-<i>mS</i>124 (<i>a</i> = 34.08 Å, <i>b</i> = 4.245 Å, <i>c</i> = 21.37 Å, β = 113.52(3)°, <i>V</i> = 2835.14 ų, <i>C</i>12/<i>m</i>1) and Ba₁₀La₂Si₁₂-<i>oP</i>48 (<i>a</i> = 17.144 Å, <i>b</i> = 4.876 Å, <i>c</i> = 17.910 Å, <i>V</i> = 1497.46 ų, <i>Pnma</i>) are carried out. For the crystal structure of Ce₅₆Ni₂₄Si₄₄-<i>m</i>S124, 5511 variants of the cluster representation of the 3D atomic network are established with the number of structural units 5 (28 variants), 6 (943 variants), 7 (2316 variants), 8 (1704), and 9 (520 variants). The variant of the self-assembly of a crystal structure from the packing components of three types of cluster-precursors <i>K</i>13 = 0@13(Ce₆CeNi₂Si₄), <i>K</i>4 = 0@4(Ce₂NiSi), and <i>K</i>3 = 0@3(CeNiSi), as well as Si spacer atoms, is considered. For the crystal structure of Ba₁₀La₂Si₁₂-<i>o</i>P48, 21 variants of the cluster representation of the 3D atomic network with the number of structural units of 2 and 3 are established. The variant of self-assembly of the crystal structure with the participation of cluster-precursors forming the packing <i>K</i>11 = 0@11(Ba5LaSi5) and Si spacer atoms is considered. The symmetry and topological code of the processes of self-assembly of 3D structures from cluster-precursors is reconstructed in the following form: primary chain → layer → framework.</p>","PeriodicalId":580,"journal":{"name":"Glass Physics and Chemistry","volume":"50 1","pages":"1 - 9"},"PeriodicalIF":0.8,"publicationDate":"2024-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141510328","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Synthesis and Research of Electrolyte and Electrode Materials in CeO2–Nd2O3 and Gd2O3–La2O3–SrO–Ni(Co)2O3 – δ Systems for Medium-Temperature Fuel Cells","authors":"M. V. Kalinina,&nbsp;I. G. Polyakova,&nbsp;S. V. Myakin,&nbsp;T. V. Khamova,&nbsp;L. N. Efimova,&nbsp;I. Yu. Kruchinina","doi":"10.1134/S108765962360117X","DOIUrl":"10.1134/S108765962360117X","url":null,"abstract":"<p>Using the method of the joint crystallization of solutions of nitrate salts with ultrasonic treatment, xerogels and highly dispersed mesoporous powders of the following composition are synthesized: (CeO₂)_{1 – <i>x</i>}(Nd₂O₃)_<i>x</i> (<i>x</i> = 0.02; 0.05; 0.10), Gd_{1 – <i>x</i>}Sr_<i>x</i>Co_0.5O_3 – δ (<i>x</i> = 0.1, 0.15, 0.2, 0, 25), Gd_0.4Sr_0.1Ni_0.5O_3 – δ, and Gd_0.125La_0.125Sr_0.25Co_0.5O_3 – δ; and based on them, nanoceramic materials with a crystalline cubic structure of the fluorite type, as well as an orthorhombic and tetragonal structure of the perovskite type with CSR ~ 55–90 nm (1300°С), respectively, are obtained. The physicochemical properties of the resulting ceramics are studied; it is revealed that it has an open porosity of 7–11% for the composition (CeO₂)_{1 – <i>x</i>}(Nd₂O₃)_<i>x</i> and 17–42% for materials with the Gd_{1 – <i>x</i>}Sr_<i>x</i>Co_0.5O_3 – δ, Gd_0.4Sr_0.1Ni_0.5O_3 – δ, and Gd_0.125La_0.125Sr_0.25Co_0.5O_3 – δ composition. Materials based on cerium oxide predominantly have the ionic (ion transport numbers <i>t</i>_i = 0.71–0.89 in the range 300–700°С) type of electrical conductivity due to the formation of mobile oxygen vacancies in the heterovalent substitution of Ce⁴⁺ by Nd³⁺; and σ_700°С = 0.31 × 10^–2 S/cm Solid solutions based on nickelate and lanthanum cobaltite have mixed electron-ionic conductivity, σ_700°С = 0.59 × 10^–1 S/cm with transfer numbers <i>t</i>_e = 0.92–0.99 and <i>t</i>_i = 0.08–0.01. The prospects for using the obtained ceramic materials as solid oxide electrolytes and electrodes for medium-temperature fuel cells (FCs) are shown.</p>","PeriodicalId":580,"journal":{"name":"Glass Physics and Chemistry","volume":"50 1","pages":"17 - 30"},"PeriodicalIF":0.8,"publicationDate":"2024-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141519222","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Production of Block Catalysts for Carbon Monoxide Oxidation Using Additive Technologies","authors":"O. A. Cheremisina,&nbsp;M. M. Sychev,&nbsp;A. S. Dolgin,&nbsp;T. A. Vishnevskaya,&nbsp;N. V. Mal’tseva,&nbsp;A. S. Volobueva","doi":"10.1134/S1087659623601247","DOIUrl":"10.1134/S1087659623601247","url":null,"abstract":"<p>A method is developed for producing primary catalyst carriers in the form of honeycomb blocks using additive technologies. The composition of the molding slip is developed and its rheological properties are optimized. Block catalysts based on primary supports formed by 3D printing are obtained. It is shown that these products are highly productive in the process of the catalytic oxidation of CO with atmospheric oxygen and it is possible to further increase it due to the formation of channels of complex geometric shapes, which make it possible to intensify the processes of heat and mass transfer.</p>","PeriodicalId":580,"journal":{"name":"Glass Physics and Chemistry","volume":"50 1","pages":"31 - 35"},"PeriodicalIF":0.8,"publicationDate":"2024-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141519223","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Features of Barium–Strontium Cobaltite as a Catalyst for Hydrogen Generation","authors":"M. S. Paizullakhanov,&nbsp;O. R. Parpiev,&nbsp;F. N. Ernazarov,&nbsp;N. Kh. Karshieva,&nbsp;O. N. Ruzimuradov,&nbsp;O. A. Shilova","doi":"10.1134/S1087659623601181","DOIUrl":"10.1134/S1087659623601181","url":null,"abstract":"<p>Anion-deficient structures based on a Sr_0.5Ba_0.5Co_{1 – <i>x</i>}Fe_<i>x</i>O_3 – δ composition, synthesized from a melt in a solar oven in a flux of concentrated solar radiation with a density of 100–200 W/cm² are studied. Briquettes in the form of tablets based on a stoichiometric mixture of carbonates and oxides of the corresponding metals (SrCO₃ + BaCO₃ + Co₂O₃ + Fe₂O₃) are melted in the focal zone of the great solar furnace. Melt drops flow into the water, cooling at a rate of 10³ deg/s. The castings were ground to a fineness of 63 µm, dried at 400°C, and molded into tablets (samples) with a diameter of 20 mm and a height of 10 mm. Samples of the material are sintered in the temperature range 1050–1250°C. The samples are used to study the structure, water absorption, and destruction in a carbon dioxide environment. The crystal lattice of the material has a perovskite structure with the unit cell parameter <i>a</i> = 4.04 Å. Samples of the material show resistance to water vapor. The observed values of the structural parameters indicate that the material of composition Sr_0.5Ba_0.5Co_0.8Fe_0.2O_2.78 can be used as a catalyst for the generation of hydrogen and synthesis gas through reforming and methane oxidation.</p>","PeriodicalId":580,"journal":{"name":"Glass Physics and Chemistry","volume":"50 1","pages":"55 - 60"},"PeriodicalIF":0.8,"publicationDate":"2024-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141519226","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Ultralow Melting Ammonium Polyphosphate Compounds","authors":"A. Yu. Shaulov,&nbsp;A. V. Grachev,&nbsp;N. V. Avramenko,&nbsp;V. Yu. Bychkov,&nbsp;A. V. Lyubimov,&nbsp;A. A. Berlin","doi":"10.1134/S108765962360120X","DOIUrl":"10.1134/S108765962360120X","url":null,"abstract":"<p>When low molecular weight ammonium polyphosphate interacts with polyethylene polyamine, thermoplastic polymers containing fractions with glass transition temperatures <i>T</i>_glass ≥ –95°C are obtained. Their thermal and heat resistance, as well as moisture resistance, is measured at a humidity of 40–50%. The structure and chemical scheme for the formation of interaction products are proposed.</p>","PeriodicalId":580,"journal":{"name":"Glass Physics and Chemistry","volume":"50 1","pages":"61 - 67"},"PeriodicalIF":0.8,"publicationDate":"2024-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141519227","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}