Perspektivnye Materialy最新文献

Features of the defect structure and photoluminescence of nominally pure LiNbO3 crystals grown from boron doped charge 掺杂硼的名义纯LiNbO3晶体的缺陷结构和光致发光特性

Perspektivnye Materialy Pub Date : 2023-01-01 DOI: 10.30791/1028-978x-2023-2-32-43

N. V. Sidorov, A. Kadetova, M. Smirnov, R. Titov, N. Teplyakova, M. Palatnikov

{"title":"Features of the defect structure and photoluminescence of nominally pure LiNbO3 crystals grown from boron doped charge","authors":"N. V. Sidorov, A. Kadetova, M. Smirnov, R. Titov, N. Teplyakova, M. Palatnikov","doi":"10.30791/1028-978x-2023-2-32-43","DOIUrl":"https://doi.org/10.30791/1028-978x-2023-2-32-43","url":null,"abstract":"Features of the defect structure of nominally pure LiNbO3:В crystals were investigated by X-ray diffraction analysis and photoluminescence. Crystals were grown by the Czochralski from a mixture of congruent composition charge containing 0.08 and 0.12 wt. % boron. At this, the concentration of boron in crystals is at the level of trace amounts of metallic impurities and is ~ 10–4 wt%. MeO6 oxygen-octahedral clusters are responsible for the ferroelectric and nonlinear optical properties of the crystal. It has been found that in LiNbO3:B crystals, the lengths of O–O, Me–O, and Me–Me (Me–Li, Nb) bonds in clusters, the arrangement of Me cations, vacancies, and NbLi point defects along the polar axis differ significantly from those for nominally pure congruent crystal. NbLi defects and transition metals are deep electron traps responsible for the photorefraction effect. The photoluminescence spectra showed that the concentration of defects and metals in the investigated LiNbO3:B crystals is lower than in the congruent crystal. these differences can be due to both a change in the properties of the boron-containing melt and the localization of trace amounts of boron in the O4 tetrahedral gaps of the LiNbO3 crystal structure. In the first case, reactive boron binds cations of niobium and transition metals in the melt into stable complexes.","PeriodicalId":20003,"journal":{"name":"Perspektivnye Materialy","volume":"65 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74600246","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}

引用次数: 0

Effect of synthesis conditions on the physicochemical properties of хerogels, nanopowders and ceramic materials in the CeO2 – Nd2O3 system 合成条件对хerogels、纳米粉体和陶瓷材料在CeO2 - Nd2O3体系中理化性质的影响

Perspektivnye Materialy Pub Date : 2023-01-01 DOI: 10.30791/1028-978x-2023-7-23-33

M. Kalinina, D. A. Dyuskina, T. V. Khamova, L. N. Yefimova, I. Kruchinina, O. Shilova

引用次数: 0

Laser-ultrasonic study of local porosity distribution in CFRP stringer panels CFRP弦板局部孔隙率分布的激光超声研究

Perspektivnye Materialy Pub Date : 2023-01-01 DOI: 10.30791/1028-978x-2023-7-73-83

Yu. G. Sokolovskaya, N. Podymova, A. Karabutov

引用次数: 0

Investigation of the effect of LiCl and LiF additives on the kinetics of Spark Plasma Sintering of fine-grained alumina LiCl和LiF添加剂对细晶氧化铝放电等离子烧结动力学影响的研究

Perspektivnye Materialy Pub Date : 2023-01-01 DOI: 10.30791/1028-978x-2023-1-66-79

M. Boldin, A. Popov, G. Shcherbak, K. Smetanina, D. Permin, V. A. Koshkin, A. Nokhrin, V. Chuvil’deev, А. А. Moskvichev, A. Murashov

{"title":"Investigation of the effect of LiCl and LiF additives on the kinetics of Spark Plasma Sintering of fine-grained alumina","authors":"M. Boldin, A. Popov, G. Shcherbak, K. Smetanina, D. Permin, V. A. Koshkin, A. Nokhrin, V. Chuvil’deev, А. А. Moskvichev, A. Murashov","doi":"10.30791/1028-978x-2023-1-66-79","DOIUrl":"https://doi.org/10.30791/1028-978x-2023-1-66-79","url":null,"abstract":"The effect of the lithium chloride and lithium fluoride additives (2 wt. %) on the kinetics of Spark Plasma Sintering of industrial fine alumina powder was investigated. The Al2O3 + 2 % LiF powder was obtained by mixing the α-Al2O3 fine powders with the aqueous solution of LiF. The Al2O3 + 2 % LiCl fine powder was obtained by joint grinding of the components in a planetary mill. The sintering of the powders was performed with the heating rates of 10 and 50 °C/min up to the temperature corresponding to the end of the shrinkage. The ceramics sintered with the heating rate of 10 °C/min had the relative density of 97.4 – 98.7 %. The addition of lithium fluoride into the alumina powder was found to allow reducing the temperature of the beginning of the intensive powder shrinkage from 1400 – 1500 °C down to 1255 – 1335 °C. LiCl was shown to evaporate at low heating temperatures and not to affect the compaction intensity of the Al2O3 powder. The presence of the overheated LiF melt (not having enough time to evaporate from the specimen volume completely) in the ceramics leads to the appearance of the residual porosity and to the reduction of the hardness of the ceramics. Using the Young – Cutler equation, the powder compaction mechanisms were determined for pure alumina α-Al2O3 and for the powder compositions with the LiCl and LiF additives in the rapid heating conditions. The sintering activation energy was shown to be close to the one of the grain boundary diffusion. The LiF melt was found to promote the sliding of the Al2O3 fine particles during the low-temperature compaction stage.","PeriodicalId":20003,"journal":{"name":"Perspektivnye Materialy","volume":"15 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87831234","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}

引用次数: 0

Percutaneous delivery system for nicotinamide transdermal therapeutic system 用于烟酰胺透皮治疗系统的经皮给药系统

Perspektivnye Materialy Pub Date : 2023-01-01 DOI: 10.30791/1028-978x-2023-7-46-56

E. G. Kuznetsova, V. A. Ryzhikova, L. A. Salomatina, O. M. Kuryleva, V. Sevastianov

{"title":"Percutaneous delivery system for nicotinamide transdermal therapeutic system","authors":"E. G. Kuznetsova, V. A. Ryzhikova, L. A. Salomatina, O. M. Kuryleva, V. Sevastianov","doi":"10.30791/1028-978x-2023-7-46-56","DOIUrl":"https://doi.org/10.30791/1028-978x-2023-7-46-56","url":null,"abstract":"Recently, antioxidants, one of which is nicotinamide, have often been used in the treatment of a number of chronic cardiovascular, autoimmune, skin diseases, and diabetes mellitus. Taking into account the frequent and long-term use of nicotinamide, it seems appropriate to the authors to create a new dosage form of a transdermal therapeutic system (TTS) capable of maintaining the required level of the drug concentration in the blood for a long time. The aim of the work was to develop and to study the functional properties of a system for percutaneous delivery of nicotinamide in vitro. Four compositions of the percutaneous delivery emulsion system for the nicotinamide TTS were suggested, in which the amount of the percutaneous carrier of sodium docusate was varied. Studies of the diffusion of nicotinamide in vitro through unconserved rabbit skin have shown that an increase in the concentration of sodium docusate by three times (from 3.3 % to 9.8 %) significantly increases the amount of the diffused drug substance by 15% and decreases the amount of nicotinamide remaining in the TTS. The amount of the antioxidant founded in the skin flap was lower than the therapeutic dose (~ 1.46 % of its initial amount in TTS) 24 hours after the start of the in vitro experiment. It indicates the absence of a possible aftereffect of nicotinamide TTS in its clinical use after detaching from the patient’s skin.","PeriodicalId":20003,"journal":{"name":"Perspektivnye Materialy","volume":"54 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86394165","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}

引用次数: 0

Research of nanosized iron oxide powder as a biologically active material 纳米氧化铁粉作为生物活性材料的研究

Perspektivnye Materialy Pub Date : 2023-01-01 DOI: 10.30791/1028-978x-2023-4-42-49

V. Kataev, M. A. Fedotov, N. A. Andreeva, A. Fomina, V. A. Volchenkova, A. A. Alpatov

引用次数: 0

Preparation of thin nanostructured n-WSe2 films and their application in semiconductor p-Si photocathodes for hydrogen production by water splitting 纳米结构n-WSe2薄膜的制备及其在半导体p-Si光电阴极中的应用

Perspektivnye Materialy Pub Date : 2023-01-01 DOI: 10.30791/1028-978x-2023-6-5-16

O. Rubinkovskaya, D. Fominski, V. Nevolin, R. Romanov, P. Kartsev, Hualin Jiang, V. Fominski

{"title":"Preparation of thin nanostructured n-WSe2 films and their application in semiconductor p-Si photocathodes for hydrogen production by water splitting","authors":"O. Rubinkovskaya, D. Fominski, V. Nevolin, R. Romanov, P. Kartsev, Hualin Jiang, V. Fominski","doi":"10.30791/1028-978x-2023-6-5-16","DOIUrl":"https://doi.org/10.30791/1028-978x-2023-6-5-16","url":null,"abstract":"The possibilities of modification of the structure and type of conductivity of WSe2 films formed on p-type silicon by thermal treatment of a thin-film precursor, which was preliminarily created by pulsed laser deposition, are studied. Pulsed laser ablation of WSe2 and rhenium targets made it possible to obtain amorphous films WSex (x > 2) containing rhenium atoms and inclusions of β-W nanoparticles. Heat treatment at 450 °C caused the crystallization of the amorphous matrix and the formation of a layered 2H-WSe2 shell surrounded the metal nanoparticles. Doping with rhenium led to the production of n-type WSe2 semiconductor films, which, in terms of their properties (band gap ~ 1.2 eV, high catalytic activity, low resistance to current transport), represent a promising material for creating p-Si photocathodes for efficient light-activated hydrogen evolution in acid solution. Theoretical calculations are carried out, which make it possible to identify local areas on the surface of the formed WSe2 films with enhanced catalytic activity in hydrogen evolution reaction.","PeriodicalId":20003,"journal":{"name":"Perspektivnye Materialy","volume":"106 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76084611","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}

引用次数: 0

Effect of electron-beam treatment on the nature of fatigue crack propagation and formation of plastic zones on fracture surfaces in TiNi shape memory alloy 电子束处理对TiNi形状记忆合金疲劳裂纹扩展性质及断口塑性区形成的影响

Perspektivnye Materialy Pub Date : 2023-01-01 DOI: 10.30791/1028-978x-2023-1-5-18

S. Meisner, L. Meisner

{"title":"Effect of electron-beam treatment on the nature of fatigue crack propagation and formation of plastic zones on fracture surfaces in TiNi shape memory alloy","authors":"S. Meisner, L. Meisner","doi":"10.30791/1028-978x-2023-1-5-18","DOIUrl":"https://doi.org/10.30791/1028-978x-2023-1-5-18","url":null,"abstract":"Influence of surface electron-beam processing on character of fatigue cracks propagation and crack growth rates under cyclic tension in a mode of low-cycle loading of TiNi samples before and after irradiation by low-energy high-current electron beam (LEHCEB) is studied in the work. Correlation between stages of fatigue cracks propagation and formation of plastic zones on surfaces of failure in TiNi samples before and after LEHCEB treatments is established. The LEHCEB treatment of specimen surfaces was carried out at the electron-beam installation “RITM-SP” with the electron beam parameters: energy density ES = 3.7 J/cm2, pulse duration τ = 2.5 μs, number of pulses n = 5. Differences in the stages of propagation of main fatigue cracks during cyclic stretching of TiNi samples before and after LEHCEB have been revealed. Preferential mechanisms of quasistatic and fatigue fracture at different stages of crack propagation are determined. It is shown that LEHCEB treatment leads to a shift of fatigue fracture initiation and the beginning of all stages by ∆N ≥ 3000, increasing the cyclic durability of the specimens by ~ 1.5 times. The greatest influence of surface modification is shown on Stage I of fatigue crack propagation. The lower rate of fatigue crack propagation at this stage in irradiated specimens leads to an increase in its duration as compared to unirradiated specimens. It is concluded that to effectively increase the fatigue life of TiNi specimens by means of LEHCEB treatments it is necessary to create conditions for increasing the number of cycles before the Stage I initiation and maximizing the duration of this stage.","PeriodicalId":20003,"journal":{"name":"Perspektivnye Materialy","volume":"258 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76208457","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}

引用次数: 0

Magnetic properties of SMC materials based on iron powder with multilayer insulating coating 多层绝缘涂层铁粉基SMC材料的磁性研究

Perspektivnye Materialy Pub Date : 2023-01-01 DOI: 10.30791/1028-978x-2023-5-66-71

G. Govor, A. Larin, O. Demidenko, A. L. Zheludkevich

引用次数: 0

Adsorption properties with respect to methane of a functional porous material based on coffee waste 基于咖啡渣的功能多孔材料对甲烷的吸附特性

Perspektivnye Materialy Pub Date : 2023-01-01 DOI: 10.30791/1028-978x-2023-6-42-51

A. Memetova, A. Zelenin, N. Memetov, V. Yagubov, N. Chapaksov, R. Stolyarov, A. Gerasimova, E. Mkrtchyan

{"title":"Adsorption properties with respect to methane of a functional porous material based on coffee waste","authors":"A. Memetova, A. Zelenin, N. Memetov, V. Yagubov, N. Chapaksov, R. Stolyarov, A. Gerasimova, E. Mkrtchyan","doi":"10.30791/1028-978x-2023-6-42-51","DOIUrl":"https://doi.org/10.30791/1028-978x-2023-6-42-51","url":null,"abstract":"A new microporous carbon material (MUM-51) was obtained from waste coffee grounds by carbonization and activation of KOH. MUM-51 has been characterized by various methods, including N2 adsorption-desorption at 77 K, X-ray diffraction analysis, Fourier transform IR spectroscopy, and Raman spectroscopy. Methane adsorption was studied on the resulting adsorbent at pressures up to 10 MPa and temperatures of 298.15, 303.15, 308.15, 313.15, 318.15, and 323.15 K. The specific pore volume of the adsorbent according to DFT is VDFT = 1.604 cm3/g. The BET specific surface is SBET = 3456 m2/g. The maximum value of methane adsorption at a temperature of 298,15 K and a pressure of 10 MPa reaches ~ 19 mmol/g. Experimental data on methane adsorption on MUM-51 were analyzed using the Dubinin–Radushkevich adsorption model in the temperature range 298.15 – 323.15 K and pressures up to 10 MPa. It has been established that the average relative deviations between the experimental results and the results obtained using the Dubinin-Radushkevich model are less than 3%. The initial differential molar heat of methane adsorption on the MUM-51 adsorbent is 28.7 kJ/mol. The results of the work showed that the carbon material obtained from waste coffee grounds, which has a high specific surface area and porosity, can be effectively used as an adsorbent for greenhouse gases, in particular methane.","PeriodicalId":20003,"journal":{"name":"Perspektivnye Materialy","volume":"22 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83224092","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}

引用次数: 0