Inorganic Materials最新文献_第5页

Thermochemical Synthesis of Molybdenum Carbide on the Basis of the (NH4)6Mo7O24–NH4NO3–C6H12N4 System

IF 0.9 4区材料科学

Inorganic Materials Pub Date : 2025-03-18 DOI: 10.1134/S0020168524701528

K. B. Podbolotov, Yu. A. Egorova, L. V. Dogotar’, S. V. Vasilevich, A. N. Asadchii

{"title":"Thermochemical Synthesis of Molybdenum Carbide on the Basis of the (NH4)6Mo7O24–NH4NO3–C6H12N4 System","authors":"K. B. Podbolotov, Yu. A. Egorova, L. V. Dogotar’, S. V. Vasilevich, A. N. Asadchii","doi":"10.1134/S0020168524701528","DOIUrl":"10.1134/S0020168524701528","url":null,"abstract":"Data on the thermochemical synthesis of molybdenum carbide on the basis of the (NH4)6Mo7O24–NH4NO3–C6H12N4 system at different component ratios have been reported. Thermodynamic computations have been performed to establish composition regions for probable exothermic reactions to produce molybdenum carbide: 10–20 moles of ammonium nitrate per 1 mole of ammonium molybdate and the ratio of reducing agent to oxidizing agent (φ) equal to 1.5–4.0. It has been found that the reaction in ammonium molybdate–ammonium nitrate–urotropin system includes several stages, the main exothermic reaction is observed after temperature of 120–180°C is reached. Molybdenum carbide forms at φ ≥ 6.5 after thermal treatment at 1000°C under inert atmosphere. The reaction leads to fine crystalline structure of particles with size of 100–200 nm. The obtained materials based on molybdenum carbide show catalytic activity in the conversion of products of incomplete combustion of biofuel (pyrolysis resins). Addition of the obtained materials to pyrolysis resin in 1/10 ratio enhances its conversion (rate parameter increases by 2–10 times), reduces average process temperature by 50–100°C, and decreases activation energy from 82 to 52–65 kJ/mol.","PeriodicalId":585,"journal":{"name":"Inorganic Materials","volume":"60 10","pages":"1205 - 1215"},"PeriodicalIF":0.9,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143645485","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}

引用次数: 0

Vapor–Liquid Equilibrium in the Ni(PF3)4–Hydrocarbon C5–C8 and Chloroalkane CH4–nCln (n = 2–4) System

IF 0.9 4区材料科学

Inorganic Materials Pub Date : 2025-03-18 DOI: 10.1134/S0020168524701607

D. M. Zimina, O. Yu. Troshin, A. Yu. Sozin

引用次数: 0

Europium-Containing Luminescent Composites Based on Lead(II)-Modified Poly(methylmethacrylate)

IF 0.9 4区材料科学

Inorganic Materials Pub Date : 2025-03-18 DOI: 10.1134/S0020168524701334

V. P. Smagin, P. M. Kotel’nikova

{"title":"Europium-Containing Luminescent Composites Based on Lead(II)-Modified Poly(methylmethacrylate)","authors":"V. P. Smagin, P. M. Kotel’nikova","doi":"10.1134/S0020168524701334","DOIUrl":"10.1134/S0020168524701334","url":null,"abstract":"Composites based on poly(methylmethacrylate) (PMMA) and lead and europium salts, with the compositions PMMA/Pb(CF3COO)2 and PMMA/Pb(CF3COO)2,Eu(CF3COO)3, have been prepared by curing methylmethacrylate (MMA) based solutions via thermal radical block polymerization of MMA. The refractive index of MMA + Pb(CF3COO)2 solutions and the density of the PMMA/Pb(CF3COO)2 polymer composites have been shown to increase linearly as the Pb salt concentration increases to 83 wt % (40 wt % elemental Pb). The optical transmission of the composites at wavelengths above 450 nm and the highest lead and europium concentrations reaches 90% at sample thicknesses of up to 5 mm. The lead equivalent at a Pb(II) concentration of 40 wt % is 0.010. Photoluminescence in the PMMA/Pb(CF3COO)2,Eu(CF3COO)3 composites is due to Eu3+ electronic transitions from the 5D0 metastable electron energy level to the 7Fj sublevels of the ground level. We have demonstrated the influence of lead(II) and europium(III) on the properties of the matrix and the influence of the matrix and Pb(II) on absorption and luminescence spectra of europium(III).","PeriodicalId":585,"journal":{"name":"Inorganic Materials","volume":"60 9","pages":"1152 - 1160"},"PeriodicalIF":0.9,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143645463","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}

引用次数: 0

Solid-Phase Synthesis and Structural Features of Compound Cu3NaS2

IF 0.9 4区材料科学

Inorganic Materials Pub Date : 2025-03-18 DOI: 10.1134/S0020168524701504

R. F. Al’mukhametov, A. D. Davletshina, V. V. Astanin, B. M. Akhmetgaliev

引用次数: 0

Synthesis of One-Dimensional Molybdenum Trioxide Structures and Influence of Aqueous Sucrose Solution on Hydrothermal Treatment of the Structures

IF 0.9 4区材料科学

Inorganic Materials Pub Date : 2025-03-13 DOI: 10.1134/S0020168524701322

T. M. Zima, N. F. Uvarov

引用次数: 0

Self-Propagating High-Temperature Synthesis Compaction of Titanium Nickelide: Effect of Oxygen and Hydrogen Impurities on the Structure and Properties of the Alloys

IF 0.9 4区材料科学

Inorganic Materials Pub Date : 2025-03-13 DOI: 10.1134/S0020168524701267

Yu. V. Bogatov, V. A. Shcherbakov, D. Yu. Kovalev, N. P. Cherezov, T. V. Barinova, O. D. Boyarchenko, M. I. Alymov

{"title":"Self-Propagating High-Temperature Synthesis Compaction of Titanium Nickelide: Effect of Oxygen and Hydrogen Impurities on the Structure and Properties of the Alloys","authors":"Yu. V. Bogatov, V. A. Shcherbakov, D. Yu. Kovalev, N. P. Cherezov, T. V. Barinova, O. D. Boyarchenko, M. I. Alymov","doi":"10.1134/S0020168524701267","DOIUrl":"10.1134/S0020168524701267","url":null,"abstract":"Titanium nickelide alloys have been prepared by self-propagating high-temperature synthesis compaction using equiatomic mixtures of nickel and titanium powders. The alloys were synthesized in a “sand” press die with the use of a “chemical furnace” and in a rigid press die. In the latter process, reaction mixtures were first subjected to mechanical activation (MA), which made it possible to carry out exothermic synthesis and consolidation of the synthesis products without preheating. No inert atmosphere was used in the syntheses. We obtained titanium nickelide samples 70 mm in diameter and 8 mm in thickness. The percentage of the NiTi phase has been shown to depend on the combustion temperature of the Ni + Ti powder mixture and the percentages of oxygen and hydrogen in the starting titanium powder. The largest percentage of the NiTi phase (85 vol %) was reached at a combustion temperature of 1400°C with the use of titanium containing 0.55 wt % oxygen and 0.14 wt % hydrogen. An increase in the oxygen content of the Ni + Ti powder mixture to 2.3 wt % as a result of MA leads to an increase in the content of the Ti2Ni phase in the alloy to 53 vol %. As the hydrogen content of titanium increases to 0.6 wt %, the combustion temperature and speed decrease and free Ni remains in the alloy. The alloys with the highest content of the NiTi phase have the lowest microhardness: HV = 6.2 GPa. As the percentage of the Ti2Ni, Ni3Ti, and Ni4Ti3 phases in the alloys increases, their hardness rises to HV = 11.1 GPa.","PeriodicalId":585,"journal":{"name":"Inorganic Materials","volume":"60 8","pages":"960 - 969"},"PeriodicalIF":0.9,"publicationDate":"2025-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143602121","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}

引用次数: 0

Homogeneous and Heterogeneous Mechanisms of Crystal Nucleation in Silver-Containing Lithium Silicate Glasses

IF 0.9 4区材料科学

Inorganic Materials Pub Date : 2025-03-13 DOI: 10.1134/S0020168524701280

G. A. Sycheva

引用次数: 0

Effect of the Particle Size of the Components of CaWO4–Al2O3 Composites on Their Transport Properties

IF 0.9 4区材料科学

Inorganic Materials Pub Date : 2025-03-13 DOI: 10.1134/S0020168524701218

A. F. Guseva, N. N. Pestereva, A. A. Tushkova, O. V. Russkikh, L. V. Adamova

{"title":"Effect of the Particle Size of the Components of CaWO4–Al2O3 Composites on Their Transport Properties","authors":"A. F. Guseva, N. N. Pestereva, A. A. Tushkova, O. V. Russkikh, L. V. Adamova","doi":"10.1134/S0020168524701218","DOIUrl":"10.1134/S0020168524701218","url":null,"abstract":"We have studied the effect of the grain size of aluminum oxide and calcium tungstate on the transport properties of (1 – x)СaWO4–xAl2O3 composites with a mole fraction of aluminum oxide x ≤ 0.35. The phase composition and thermodynamic stability of the composites were ascertained by X-ray diffraction, thermogravimetry, and differential scanning calorimetry. Their surface morphology was examined by electron microscopy and their elemental composition was determined by X-ray microanalysis. The electrical conductivity of the composites was determined by electrochemical impedance measurements and analyzed as a function of temperature, oxygen pressure in the gas phase, dispersoid (aluminum oxide) concentration, and the grain size of their components. The conductivity of the (1 – x)СaWO4–xAl2O3 composites containing 5–10 mol % aluminum oxide was found to exceed that of CaWO4 by more than one order of magnitude. Varying the average grain size of the Al2O3 nanopowder from 21 to 82 nm caused no appreciable changes in the conductivity of the composites, which was due to the polydispersity of the aluminum oxide, whereas reducing the average grain size of CaWO4 from 6.4 to 1.6 μm led to a twofold increase in the conductivity of the composites.","PeriodicalId":585,"journal":{"name":"Inorganic Materials","volume":"60 8","pages":"983 - 993"},"PeriodicalIF":0.9,"publicationDate":"2025-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143602335","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}

引用次数: 0

Structure and Magnetic Properties of Eu1–xSrxMnO3 (x = 0.0, 0.25) Manganites

IF 0.9 4区材料科学

Inorganic Materials Pub Date : 2025-03-13 DOI: 10.1134/S0020168524701255

O. M. Fedorova, L. B. Vedmid’, S. A. Uporov

引用次数: 0

Synthesis and Characterization of a KSrGd(MoO4)3:Er3+/Yb3+ Upconversion Phosphor

IF 0.9 4区材料科学

Inorganic Materials Pub Date : 2025-03-13 DOI: 10.1134/S0020168524701309

N. M. Kozhevnikova

引用次数: 0