Inorganic Materials最新文献_第10页

Luminescence of Thioglycolic Acid-Passivated PbS Quantum Dots in the Presence of Potassium Iodide 碘化钾存在时硫代乙醇酸钝化铅锡量子点的发光特性

IF 0.9 4区材料科学

Inorganic Materials Pub Date : 2024-03-10 DOI: 10.1134/S0020168523100047

I. G. Grevtseva, K. S. Chirkov, O. V. Ovchinnikov, M. S. Smirnov

{"title":"Luminescence of Thioglycolic Acid-Passivated PbS Quantum Dots in the Presence of Potassium Iodide","authors":"I. G. Grevtseva, K. S. Chirkov, O. V. Ovchinnikov, M. S. Smirnov","doi":"10.1134/S0020168523100047","DOIUrl":"10.1134/S0020168523100047","url":null,"abstract":"In this paper, we discuss general trends in the IR luminescence of colloidal PbS quantum dots 3 nm in average size, capped with thioglycolic acid molecules (PbS/TGA QDs). Treatment of the PbS/TGA QDs with a KI solution has been shown to cause a shift of a composite luminescence band peaking at 1120 nm to shorter wavelengths, to 1060 nm; an increase in the quantum yield of its shorter wavelength component, related to excitonic emission, from 1 to 10%; and quenching of its longer wavelength component, due to radiative recombination at defect levels. In this process, the cubic structure of PbS undergoes no changes. The average size of the PbS/TGA QDs has been shown to decrease slightly, by 0.2–0.3 nm. The conclusion has been drawn that the increase in the quantum yield of excitonic emission from the PbS/TGA QDs as a result of KI treatment is due to the more efficient passivation of interfacial defects, which act as both recombination luminescence and nonradiative carrier recombination channels. Using thermoluminescence in the temperature range from 80 to 350 K, we have demonstrated the presence of two types of shallow localized states, at 0.17- and 0.25-eV depths, whose density is only slightly sensitive to treatment of the PbS/TGA QDs with a KI solution. We assume that some of the traps identified are due to native defects in the nanocrystals—interstitial lead and sulfur ions—rather than to dangling bonds of surface lead and sulfur atoms.","PeriodicalId":585,"journal":{"name":"Inorganic Materials","volume":"59 10","pages":"1045 - 1053"},"PeriodicalIF":0.9,"publicationDate":"2024-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142411126","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

Phase Composition and Biocompatibility of Coatings Produced on Ti–6Al–5V Titanium Alloy via Diffusion Saturation with Oxygen, Nitrogen, and Carbon 通过氧、氮和碳扩散饱和在 Ti-6Al-5V 钛合金上生成的涂层的相组成和生物相容性

IF 0.9 4区材料科学

Inorganic Materials Pub Date : 2024-03-10 DOI: 10.1134/S0020168523100138

M. F. Vende, M. Yu. Semenov, B. E. Vintaikin, A. E. Smirnov, V. A. El’chaninova, Yu. I. Vinogradov

{"title":"Phase Composition and Biocompatibility of Coatings Produced on Ti–6Al–5V Titanium Alloy via Diffusion Saturation with Oxygen, Nitrogen, and Carbon","authors":"M. F. Vende, M. Yu. Semenov, B. E. Vintaikin, A. E. Smirnov, V. A. El’chaninova, Yu. I. Vinogradov","doi":"10.1134/S0020168523100138","DOIUrl":"10.1134/S0020168523100138","url":null,"abstract":"Ti–6Al–5V titanium alloy was subjected to surface saturation with carbon, nitrogen, and oxygen in order to study the effect of surface modification on its wear resistance and biocompatibility. The alloy was saturated with carbon and nitrogen in low-pressure atmospheres. Oxygenation was carried out by heating the alloy in a solid carburizing agent. The structure and phase state of the grown layers were studied by optical microscopy and X-ray diffraction. General trends in the saturation of the titanium alloy with nonmetals are the formation of a diffusion layer and an increase in the amount of phases based on the α-Ti solid solution, followed by the formation of intermediate phases, such as carbides, nitrides, and oxides differing in stoichiometry, on the surface of the continuous layer. After saturation, the alloy was covered with thin carbide, nitride, and oxide surface layers and had diffusion layers under them. The hardness of the nitrogenated and oxygenated surfaces was 950–1000 HV, and that of the surfaces saturated with carbon was 570 HV. The wear resistance of the alloy was lowest in the as-prepared state and highest after oxygenation. Biocompatibility was assessed from the proliferation of osteoblast-like cells of the MG-63 line. The best biocompatibility was demonstrated by the oxygenated samples, and the biocompatibility of the nitrogenated samples was better than that of the carburized samples. The untreated alloy showed the lowest biocompatibility.","PeriodicalId":585,"journal":{"name":"Inorganic Materials","volume":"59 10","pages":"1140 - 1147"},"PeriodicalIF":0.9,"publicationDate":"2024-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142411127","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

Oxygen Storage Capacity of Y0.8Ca0.2BaCo4 – xMxO7 + δ (M = Fe, Ga, Al; 0 < x < 1) Solid Solutions during Thermal Cycling in Air Y0.8Ca0.2BaCo4 - xMxO7 + δ（M = Fe、Ga、Al；0 < x < 1）固溶体在空气中热循环时的储氧能力

IF 0.9 4区材料科学

Inorganic Materials Pub Date : 2024-03-10 DOI: 10.1134/S0020168523100126

D. I. Turkin, K. S. Tolstov, M. V. Yurchenko, A. Yu. Suntsov, V. L. Kozhevnikov

引用次数: 0

Synthesis and Thermodynamic Functions of Ruthenium Ditelluride 二碲化钌的合成与热力学功能

IF 0.9 4区材料科学

Inorganic Materials Pub Date : 2024-03-10 DOI: 10.1134/S0020168523100102

N. A. Polotnyanko, A. V. Tyurin, D. A. Chareev, A. V. Khoroshilov, E. A. Popov

{"title":"Synthesis and Thermodynamic Functions of Ruthenium Ditelluride","authors":"N. A. Polotnyanko, A. V. Tyurin, D. A. Chareev, A. V. Khoroshilov, E. A. Popov","doi":"10.1134/S0020168523100102","DOIUrl":"10.1134/S0020168523100102","url":null,"abstract":"In this paper, we report the synthesis of crystalline ruthenium ditelluride (RuTe2) and its thermodynamic properties in the range from 10 to 965 K, evaluated from its isobaric heat capacity Cp determined using calorimetry. At low temperatures, between 6.86 and 335.11 K, the heat capacity of the synthesized material—pure, free of impurities and foreign phases—was determined by adiabatic calorimetry. In the range 315.3–965.3 K, Cp was determined by differential scanning calorimetry. The data obtained above 298 K have been used to determine empirical coefficients of the Maier–Kelley and Khodakovsky equations. In the range 10–965 K, we have evaluated the standard thermodynamic functions: heat capacity, entropy, enthalpy increment, and reduced Gibbs energy. At 298.15 K, we have obtained (C_{p}^{ circ }) = 72.43 ± 0.14 J/(K mol), S° = 94.94 ± 0.19 J/(K mol), Н°(298.15 K) − Н°(0) = 14.60 ± 0.03 kJ/mol, and Ф° = 45.97 ± 0.09 J/(K mol). Using the absolute entropy determined by us and data in the literature and handbooks, we have estimated the standard Gibbs energy of formation of RuTe2: ΔfG°(RuTe2, cr, 298.15) = −130.5 ± 2.9 kJ/mol.","PeriodicalId":585,"journal":{"name":"Inorganic Materials","volume":"59 10","pages":"1060 - 1068"},"PeriodicalIF":0.9,"publicationDate":"2024-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140098070","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

Mechanochemical Modification of Zeolite Rocks with Polyacrylamide for the Preparation of Oil Sorbents 用聚丙烯酰胺对沸石岩进行机械化学修饰以制备石油吸附剂

IF 0.9 4区材料科学

Inorganic Materials Pub Date : 2024-03-10 DOI: 10.1134/S0020168523100035

O. N. Dabizha, T. V. Khamova, O. A. Shilova

引用次数: 0

Phase Composition and Physicomechanical Properties of β-Sialons Prepared Using NaF as a Sintering Aid 用 NaF 作为烧结助剂制备的 β-硅胶的相组成和物理力学性能

IF 0.9 4区材料科学

Inorganic Materials Pub Date : 2024-03-07 DOI: 10.1134/S0020168523090017

N. S. Akhmadullina, V. P. Sirotinkin, K. A. Kim, A. S. Lysenkov, M. G. Frolova, S. V. Fedorov, N. A. Ovsyannikov, S. N. Ivicheva, Yu. F. Kargin

引用次数: 0

Preparation of Molybdenum–Tungsten Alloy Powders via Magnesium and Calcium Vapor Reduction of Oxide Compounds 通过氧化化合物的镁和钙气相还原制备钼钨合金粉末

IF 0.9 4区材料科学

Inorganic Materials Pub Date : 2024-03-07 DOI: 10.1134/S0020168523090078

V. N. Kolosov, M. N. Miroshnichenko, T. Yu. Prokhorova

{"title":"Preparation of Molybdenum–Tungsten Alloy Powders via Magnesium and Calcium Vapor Reduction of Oxide Compounds","authors":"V. N. Kolosov, M. N. Miroshnichenko, T. Yu. Prokhorova","doi":"10.1134/S0020168523090078","DOIUrl":"10.1134/S0020168523090078","url":null,"abstract":"We report the preparation of molybdenum–tungsten alloy powders via magnesium and calcium vapor reduction of the Mo0.3W0.7O3, MgМо0.7W0.3O4, and CaМо0.7W0.3O4 compounds in the temperature range 750–880°C at residual pressures in the reactor from 5 to 15 kPa. The specific surface area of the Mo–W alloy powders prepared by reducing Mo0.3W0.7O3 slightly exceeds that of the mixture of metal powders obtained by reducing a mixture of WO3 and MoO3 under similar conditions. The specific surface area of the Mo–W alloy powders prepared via magnesium vapor reduction of the CaМо0.7W0.3O4 and MgМо0.7W0.3O4 compounds exceeds that in the case of calcium vapor reduction. We have obtained molybdenum–tungsten alloy powders having lattice parameters of 0.3153 ± 0.0001 and 0.3160 ± 0.0001 nm and ranging in specific surface area from 9 to 22 m2/g. The average crystallite size of the alloys, evaluated using the Scherrer formula, lies in the range 12–35 nm. The powders have a mesoporous structure.","PeriodicalId":585,"journal":{"name":"Inorganic Materials","volume":"59 9","pages":"940 - 948"},"PeriodicalIF":0.9,"publicationDate":"2024-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140055581","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

Synthesis and Spectral Properties of La1 – xBWO6:Erx and La1 – x – yBWO6:Ybx,Ery Upconversion Phosphors La1 - xBWO6:Erx 和 La1 - x - yBWO6:Ybx,Ery 上转换荧光粉的合成与光谱特性

IF 0.9 4区材料科学

Inorganic Materials Pub Date : 2024-03-07 DOI: 10.1134/S002016852309008X

V. A. Krut’ko, M. G. Komova, D. V. Pominova, A. V. Popov, A. B. Yaroslavtsev, G. E. Nikiforova, A. V. Gavrikov

{"title":"Synthesis and Spectral Properties of La1 – xBWO6:Erx and La1 – x – yBWO6:Ybx,Ery Upconversion Phosphors","authors":"V. A. Krut’ko, M. G. Komova, D. V. Pominova, A. V. Popov, A. B. Yaroslavtsev, G. E. Nikiforova, A. V. Gavrikov","doi":"10.1134/S002016852309008X","DOIUrl":"10.1134/S002016852309008X","url":null,"abstract":"Using LaBWO6 as a host, we have prepared a series of erbium-doped lanthanum borotungstates (LBTs), La1 – xErxBWO6, and Yb/Er-codoped La1 – x – yYbxEryBWO6, which crystallize in monoclinic crystal system (sp. gr. P21). The materials have been synthesized by ceramic route and a sol–gel (Pechini) process, followed by annealing. We have studied the spectral properties of the synthesized LBTs exhibiting the luminescence in the green spectral region upon the excitation in the near-infrared region. The highest efficiency, with Ben = 0.55%, has been obtained for La0.97Yb0.02Er0.01BWO6 composition. Sol–gel synthesis (Pechini process) has been shown to be the optimal approach for the preparation of such phosphors. Due to a combination of high upconversion efficiency and thermal stability, the synthesized upconversion phosphors can be used for the design of white light sources pumped in the near-IR spectral region.","PeriodicalId":585,"journal":{"name":"Inorganic Materials","volume":"59 9","pages":"982 - 994"},"PeriodicalIF":0.9,"publicationDate":"2024-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140055582","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

Application of the Mixing Rule to Evaluation of the Thermophysical Properties of Amorphous Fe80B20 Alloy 应用混合法则评估无定形 Fe80B20 合金的热物理性质

IF 0.9 4区材料科学

Inorganic Materials Pub Date : 2024-03-07 DOI: 10.1134/S0020168523090145

S. V. Terekhov

引用次数: 0

Zirconium and Rubidium Solubility in Aluminoborosilicate Glasses for Radioactive Waste Immobilization 用于固定放射性废物的锆和铷在铝硼硅酸盐玻璃中的溶解度

IF 0.9 4区材料科学

Inorganic Materials Pub Date : 2024-03-07 DOI: 10.1134/S0020168523090042

V. E. Eremyashev, G. G. Korinevskaya, M. A. Rassomakhin, D. E. Zhivulin

{"title":"Zirconium and Rubidium Solubility in Aluminoborosilicate Glasses for Radioactive Waste Immobilization","authors":"V. E. Eremyashev, G. G. Korinevskaya, M. A. Rassomakhin, D. E. Zhivulin","doi":"10.1134/S0020168523090042","DOIUrl":"10.1134/S0020168523090042","url":null,"abstract":"In search of novel waste form materials for vitrifying high-level radioactive waste with various compositions and improving the way in which they are used, we have prepared and investigated waste form materials in the Na2O–Rb2O–SrO(Ba,Ca)–B2O3–SiO2–Al2O3–ZrO2 system. Using electron microscopy, X-ray diffraction, and infrared spectroscopy characterization of samples prepared by rapid cooling of melts containing 3.6–4.5 mol % rubidium, we have demonstrated the formation of a homogeneous glassy material, determined the solubility limit of zirconium in the glass, and identified uniformly distributed baddeleyite crystals, which indicate that the starting melt contained excess zirconium. In samples containing 6.7–8.5 mol % rubidium, we observed the formation of a less homogeneous material with considerable amounts of crystalline zirconium- and rubidium-containing phases. Analysis of the data obtained has made it possible to optimize the percentages of zirconium and rubidium in the composition of radioactive waste in the case of its immobilization via vitrification with the use of waste form materials of the system studied here.","PeriodicalId":585,"journal":{"name":"Inorganic Materials","volume":"59 9","pages":"995 - 1001"},"PeriodicalIF":0.9,"publicationDate":"2024-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140053817","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