Russian Journal of Physical Chemistry A最新文献

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Vapor Pressures and Enthalpies of Vaporization of Malic Acid Esters 苹果酸酯的蒸汽压和汽化焓
IF 0.7 4区 化学
Russian Journal of Physical Chemistry A Pub Date : 2025-01-17 DOI: 10.1134/S003602442470225X
Yu. F. Yamshchikova, S. V. Portnova, E. L. Krasnykh
{"title":"Vapor Pressures and Enthalpies of Vaporization of Malic Acid Esters","authors":"Yu. F. Yamshchikova,&nbsp;S. V. Portnova,&nbsp;E. L. Krasnykh","doi":"10.1134/S003602442470225X","DOIUrl":"10.1134/S003602442470225X","url":null,"abstract":"<p>Transpiration method is used to determine the vapor pressures of diesters of malic acid and linear alcohols (C1–C5) over the 303–369 K range of temperatures. The enthalpies of vaporization of the esters at 298.2 K are calculated from the resulting data. Correlations between the enthalpies of vaporization, the Kovats indices, and the number of carbon atoms are derived. The contributions from hydroxyl groups and intermolecular hydrogen bonding <span>({{Delta }_{{{text{vap}}}}}H^circ (298.15~;{text{K}}))</span> to the overall enthalpy are determined. A modified version of the established QSPR procedure is developed for calculating the enthalpies of vaporization of hydroxy acid esters.</p>","PeriodicalId":767,"journal":{"name":"Russian Journal of Physical Chemistry A","volume":"98 13","pages":"2943 - 2951"},"PeriodicalIF":0.7,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142994875","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Colloid-Chemical and Rheological Properties of Interfacial Adsorption Layers Formed by Water-Soluble and Poorly Soluble Block Copolymers of Ethylene Oxide and Propylene Oxide 环氧乙烷和环氧丙烷水溶性和难溶嵌段共聚物界面吸附层的胶体化学和流变性能
IF 0.7 4区 化学
Russian Journal of Physical Chemistry A Pub Date : 2025-01-17 DOI: 10.1134/S003602442470242X
I. A. Gritskova, I. D. Kovtun, G. A. Romanenko, A. M. Shulgin, S. M. Levachev, A. E. Kharlov, S. N. Chvalun
{"title":"Colloid-Chemical and Rheological Properties of Interfacial Adsorption Layers Formed by Water-Soluble and Poorly Soluble Block Copolymers of Ethylene Oxide and Propylene Oxide","authors":"I. A. Gritskova,&nbsp;I. D. Kovtun,&nbsp;G. A. Romanenko,&nbsp;A. M. Shulgin,&nbsp;S. M. Levachev,&nbsp;A. E. Kharlov,&nbsp;S. N. Chvalun","doi":"10.1134/S003602442470242X","DOIUrl":"10.1134/S003602442470242X","url":null,"abstract":"<p>The colloid-chemical properties of water-soluble and poorly soluble poly(ethylene oxide) and poly(propylene oxide) block copolymers (pluronics), as well as the rheological properties of interfacial adsorption layers (IALs) formed by them and the polymer generated during polymerization initiation on the particle surface, were studied. The temperature, surfactant concentration, and polymer effects on the effective elastic modulus, determined during the lateral deformation of IALs, were evaluated. The strongest interfacial layers are formed by the poorly water-soluble pluronic, which contains a hydrophilic polyoxyethylene block surrounded by two hydrophobic polyoxypropylene blocks. The high strength of the interfacial adsorption layer on the particle surface affords polymer suspensions with high (up to 33%) polymer contents and narrow particle size distributions.</p>","PeriodicalId":767,"journal":{"name":"Russian Journal of Physical Chemistry A","volume":"98 13","pages":"3185 - 3192"},"PeriodicalIF":0.7,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142994867","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Intercalation Effect of 1-(Hydroxyethyl)-3-methylimidazolium Chloride Ionic Liquid in Na-Montmorillonite: Structural Analysis, Thermal, Dielectric Behavior, and Molecular Dynamics Simulations 1-(羟乙基)-3-甲基咪唑氯离子液体在na -蒙脱土中的插层效应:结构分析、热、介电行为和分子动力学模拟
IF 0.7 4区 化学
Russian Journal of Physical Chemistry A Pub Date : 2025-01-17 DOI: 10.1134/S0036024424702364
Ameur Akermi, Mohamed Belhocine, Fayçal Dergal, Riadh Bourzami, Mohammed Kebir, Abdelkader Ammari, Ahmed Haouzi, Somia Bouktab
{"title":"Intercalation Effect of 1-(Hydroxyethyl)-3-methylimidazolium Chloride Ionic Liquid in Na-Montmorillonite: Structural Analysis, Thermal, Dielectric Behavior, and Molecular Dynamics Simulations","authors":"Ameur Akermi,&nbsp;Mohamed Belhocine,&nbsp;Fayçal Dergal,&nbsp;Riadh Bourzami,&nbsp;Mohammed Kebir,&nbsp;Abdelkader Ammari,&nbsp;Ahmed Haouzi,&nbsp;Somia Bouktab","doi":"10.1134/S0036024424702364","DOIUrl":"10.1134/S0036024424702364","url":null,"abstract":"<p>The present study reports on the synthesis of an ionic liquid-based nanocomposite and its characterization via structural, thermal and electrical analysis. The compound (M-EtOHmim) was prepared using green chemistry, where the organic cations exchange was achieved through the intercalation of 1‑(hydroxyethyl)-3-methylimidazolium chloride. The results showed that the molecules were successfully immobilized in the matrix yielding a good thermal stability up to 260°C. The DFT computation optimization was carried out to identify the adsorption mechanism. On the other hand, the electrical conductivity analysis revealed that charge transport is strongly related to structural defects and thermal energy. Accordingly, the corresponding electrical parameters were determined. It is evident that the modifications of montmorillonite with ionic liquid significantly changes the physicochemical properties of M-EtOHmim nanocomposite, which can be used in various fields.</p>","PeriodicalId":767,"journal":{"name":"Russian Journal of Physical Chemistry A","volume":"98 13","pages":"3116 - 3133"},"PeriodicalIF":0.7,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142995052","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Inhibitory Protection of Low-Carbon Steel in a Flow of Sulfuric Acid Solution Containing Iron(III) Sulfate 低碳钢在含硫酸铁(III)硫酸溶液流动中的抑制保护作用
IF 0.7 4区 化学
Russian Journal of Physical Chemistry A Pub Date : 2025-01-17 DOI: 10.1134/S0036024424702273
Ya. G. Avdeev, A. V. Panova, T. E. Andreeva
{"title":"Inhibitory Protection of Low-Carbon Steel in a Flow of Sulfuric Acid Solution Containing Iron(III) Sulfate","authors":"Ya. G. Avdeev,&nbsp;A. V. Panova,&nbsp;T. E. Andreeva","doi":"10.1134/S0036024424702273","DOIUrl":"10.1134/S0036024424702273","url":null,"abstract":"<p>Corrosion of low-carbon steel in a flow of H<sub>2</sub>SO<sub>4</sub> solutions containing Fe<sub>2</sub>(SO<sub>4</sub>)<sub>3</sub> was studied, including media with additions of corrosion inhibitors—catamine AB (a mixture of quaternary ammonium salts) and IFKhAN-92 (3-substituted derivative of 1,2,4-triazole). In these media, partial reactions of anodic ionization of iron and cathodic reduction of H<sup>+</sup> and Fe(III) cations occur on steel. The former two reactions are kinetically controlled, while the latter is diffusion-controlled. The accelerating effect of Fe<sub>2</sub>(SO<sub>4</sub>)<sub>3</sub> on steel corrosion in an H<sub>2</sub>SO<sub>4</sub> solution is primarily due to the reduction of Fe(III). In contrast, in the inhibited acid, the accelerating effect of Fe(III) cations affects all partial reactions of steel. Data on corrosion of low-carbon steel in the flow of the given media, obtained from the mass loss of the metal samples, are in satisfactory agreement with the results of the study of partial electrode reactions. Steel corrosion in a flow of H<sub>2</sub>SO<sub>4</sub> solutions, including in the presence of inhibitors, is accelerated by Fe<sub>2</sub>(SO<sub>4</sub>)<sub>3</sub>. In these solutions, steel corrosion is determined by the convective factor, which is characteristic of diffusion-controlled processes. The IFKhAN-92 inhibitor, unlike catamine AB, significantly slows down steel corrosion in the flow of H<sub>2</sub>SO<sub>4</sub> solution containing Fe<sub>2</sub>(SO<sub>4</sub>)<sub>3</sub>. The reason for the higher inhibitory effects shown by IFKhAN-92 for steel in these solutions compared to catamine AB is the more significant slowdown of the partial electrode reactions of the metal.</p>","PeriodicalId":767,"journal":{"name":"Russian Journal of Physical Chemistry A","volume":"98 13","pages":"3017 - 3026"},"PeriodicalIF":0.7,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142994864","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Thermochemistry of Dissolution of Cobalt Tetra-4-carboxymetallophthalocyanine in Aqueous Solutions of Potassium Hydroxide at 298.15 K 四羧基金属酞菁钴在298.15 K氢氧化钾水溶液中溶解的热化学性质
IF 0.7 4区 化学
Russian Journal of Physical Chemistry A Pub Date : 2025-01-17 DOI: 10.1134/S0036024424702339
P. D. Krutov, V. E. Maizlish, O. N. Krutova, M. I. Bazanov, V. V. Chernikov, A. V. Volkov, E. E. Kiptikova
{"title":"Thermochemistry of Dissolution of Cobalt Tetra-4-carboxymetallophthalocyanine in Aqueous Solutions of Potassium Hydroxide at 298.15 K","authors":"P. D. Krutov,&nbsp;V. E. Maizlish,&nbsp;O. N. Krutova,&nbsp;M. I. Bazanov,&nbsp;V. V. Chernikov,&nbsp;A. V. Volkov,&nbsp;E. E. Kiptikova","doi":"10.1134/S0036024424702339","DOIUrl":"10.1134/S0036024424702339","url":null,"abstract":"<p>Cobalt–tetra-4-carboxyphthalocyanine complexes are synthesized. Direct calorimetry is used to determine heat effects of the dissolution of crystalline cobalt tetra-4-carboxymetallophthalocyanine in KOH aqueous solutions of various concentrations (0.002–0.02 mol/L) at 298.15 K. The standard enthalpies of formation of the compound are calculated using additive groups, based on group systematics with a Benson-type classification of fragments that considers the effect of the primary environment of atoms. Standard enthalpies of formation are calculated for products of the dissociation of tetra-4-carboxyphthalocyanine–cobalt complexes in an aqueous solution.</p>","PeriodicalId":767,"journal":{"name":"Russian Journal of Physical Chemistry A","volume":"98 13","pages":"3095 - 3099"},"PeriodicalIF":0.7,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142994865","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Micellar Effect on the Oxidation of L-sorbose by Imidazolium Fluorochromate in the Presence of Sodium Dodecyl Sulfate in a 50% (v/v) Aqueous Acetic Acid Medium—a Kinetic and Mechanistic Study 十二烷基硫酸钠存在下咪唑氟铬酸盐在50% (v/v)醋酸水溶液中氧化l -山梨糖的胶束效应——动力学和机理研究
IF 0.7 4区 化学
Russian Journal of Physical Chemistry A Pub Date : 2025-01-17 DOI: 10.1134/S0036024424702315
Ashish Tomar, Unik Arora, Jai Veer Singh
{"title":"Micellar Effect on the Oxidation of L-sorbose by Imidazolium Fluorochromate in the Presence of Sodium Dodecyl Sulfate in a 50% (v/v) Aqueous Acetic Acid Medium—a Kinetic and Mechanistic Study","authors":"Ashish Tomar,&nbsp;Unik Arora,&nbsp;Jai Veer Singh","doi":"10.1134/S0036024424702315","DOIUrl":"10.1134/S0036024424702315","url":null,"abstract":"<p>The present work examined the micellar effect of sodium dodecyl sulfate (SDS) on the kinetics of L-sorbose by imidazolium fluorochromate (IFC) oxidant in a 50% (v/v) aqueous acetic acid (AcOH) medium with a consistent ionic strength under the conditions [L-sorbose] <span>( gg )</span> [IFC] at 303 K. Perchloric acid was used as the reaction mixture’s primary source of hydrogen ions. The reaction depicted a unit-order dependence on [IFC], [L-sorbose], and [HClO<sub>4</sub>]. The effect of sodium perchlorate salt and acrylonitrile were also studied. The oxidation rates decreased with an increase in the dielectric value (<i>D</i>) of the reaction medium, and the outcomes were in accordance with the Amis (<span>(log {{k}_{1}})</span> and 1/<i>D</i>) and Kirkwood plots (<span>(log {{k}_{1}})</span> and (<i>D</i> – 1)/(2<i>D</i> + 1)). The reaction showed significant catalysis even before reaching the critical micelle concentration (CMC). However, the observed rate constants stabilized at higher SDS concentrations exceeding the CMC. Piszkiewicz’s cooperativity model was employed to describe the surfactant catalysis. The binding constant (<i>K</i><sub>D</sub>), rate constants, cooperativity index (<i>n</i>), and various thermodynamic parameters in the presence of SDS were evaluated. The products were identified as the lactone of C<sub>5</sub>-aldonic acid and formaldehyde. Based on the observed findings, a theoretical mechanistic pathway was suggested.</p>","PeriodicalId":767,"journal":{"name":"Russian Journal of Physical Chemistry A","volume":"98 13","pages":"3078 - 3087"},"PeriodicalIF":0.7,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142995143","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Isobaric (Vapor + Liquid) Equilibria for 2-Methylthiophene with 1-Octene, Cyclohexene, 2,3-Dimethyl-1-butene, and 2,3-Dimethyl-2-butene at 90.00 kPa 2-甲基噻吩与1-辛烯、环己烯、2,3-二甲基-1-丁烯和2,3-二甲基-2-丁烯在90.00 kPa下的等压平衡(蒸气+液体)
IF 0.7 4区 化学
Russian Journal of Physical Chemistry A Pub Date : 2025-01-17 DOI: 10.1134/S0036024424702534
Zhe Wang, Junzhi Li, Wei Zhao, Xiao Liang Li
{"title":"Isobaric (Vapor + Liquid) Equilibria for 2-Methylthiophene with 1-Octene, Cyclohexene, 2,3-Dimethyl-1-butene, and 2,3-Dimethyl-2-butene at 90.00 kPa","authors":"Zhe Wang,&nbsp;Junzhi Li,&nbsp;Wei Zhao,&nbsp;Xiao Liang Li","doi":"10.1134/S0036024424702534","DOIUrl":"10.1134/S0036024424702534","url":null,"abstract":"<p>The isobaric vapor-liquid equilibrium data for the four systems consisting of 1-octene + 2-methyl-thiophene, cyclohexene + 2-methylthiophene, 2,3-dimethyl-1-butene + 2-methylthiophene, and 2,3-dimethyl-2-butene + 2-methylthiophene were determined by using a modified Rose-Williams equilibrium still at 90.00 kPa. All the vapor-liquid equilibrium data measurements passed the thermodynamic consistent test by employing the Herington method. The azeotropic behavior was observed in the 1-octene + 2-methyl-thiophene system. Additionally, the experimental data were correlated by the Wilson model, and they were also compared with the original UNIFAC and UNIFAC Dortmund predictive models. All the results indicated that the measured data were in good agreement with the calculated values obtained from the Wilson. Meanwhile, the UNIFAC Dortmund model can provide better prediction result than the original UNIFAC model.</p>","PeriodicalId":767,"journal":{"name":"Russian Journal of Physical Chemistry A","volume":"98 13","pages":"3009 - 3016"},"PeriodicalIF":0.7,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142995144","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Heterogeneous Catalytic Hydrogenation-Dehydrogenation of Aromatic Compounds As a Basis of Accumulation, Storage, and Production of Chemically Pure Hydrogen 芳香族化合物的多相催化加氢-脱氢作为化学纯氢积累、储存和生产的基础
IF 0.7 4区 化学
Russian Journal of Physical Chemistry A Pub Date : 2025-01-17 DOI: 10.1134/S0036024424702285
A. N. Kalenchuk, V. I. Bogdan, L. M. Kustov, Teng He
{"title":"Heterogeneous Catalytic Hydrogenation-Dehydrogenation of Aromatic Compounds As a Basis of Accumulation, Storage, and Production of Chemically Pure Hydrogen","authors":"A. N. Kalenchuk,&nbsp;V. I. Bogdan,&nbsp;L. M. Kustov,&nbsp;Teng He","doi":"10.1134/S0036024424702285","DOIUrl":"10.1134/S0036024424702285","url":null,"abstract":"<p>The quality of hydrogen released from naphthenic substrates (bicyclohexyl and the <i>ortho</i>-, <i>meta</i>-, and <i>para</i>-isomers of perhydroterphenyl) as a result of catalytic dehydrogenation over the 3% Pt/C (sibunit) catalyst has been studied as a key criterion of the high degree of regeneration and recyclization of hydrogen storage systems. It is shown that chemically pure hydrogen without methane and carbon oxide impurities can be obtained by dehydrogenation of liquid organic hydrogen carriers (LOHCs) if the initial aromatic hydrocarbons and naphthenic substrates obtained from them were previously thoroughly thermally treated before the hydrogenation and dehydrogenation reactions, respectively, in an inert gas.</p>","PeriodicalId":767,"journal":{"name":"Russian Journal of Physical Chemistry A","volume":"98 13","pages":"3027 - 3031"},"PeriodicalIF":0.7,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142995145","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Physicochemical Properties and Functioning of Negative Electrodes with Lead-Based Coatings as Parts of Reserve Chemical Power Sources 备用化学电源用铅基涂料负极的物理化学性质及功能研究
IF 0.7 4区 化学
Russian Journal of Physical Chemistry A Pub Date : 2025-01-17 DOI: 10.1134/S0036024424702704
P. A. Shcheglov, D. A. Samsonov, A. B. Pavlenkov, T. L. Kulova, A. Yu. Rychagov, A. M. Skundin, E. Yu. Postnova
{"title":"Physicochemical Properties and Functioning of Negative Electrodes with Lead-Based Coatings as Parts of Reserve Chemical Power Sources","authors":"P. A. Shcheglov,&nbsp;D. A. Samsonov,&nbsp;A. B. Pavlenkov,&nbsp;T. L. Kulova,&nbsp;A. Yu. Rychagov,&nbsp;A. M. Skundin,&nbsp;E. Yu. Postnova","doi":"10.1134/S0036024424702704","DOIUrl":"10.1134/S0036024424702704","url":null,"abstract":"<p>Atomic force microscopy, scanning electron microscopy, X-ray diffraction phase analysis, voltammetry, and chronopotentiometry are used to study the physicochemical properties of lead coating on steel substrates obtained galvanically. The effect the oxidized surface layer and through pores in the lead coating have on the coating’s function as an anode of chemical power sources is analyzed. It is shown that at positive temperatures, the anodic oxidation of the steel substrate can contribute to the functioning of the anode during a discharge. The high discharge characteristics of lead-coated anodes with no barrier layers on steel substrates at temperatures of −50 to +50°С are confirmed by tests of pilot batches of Pb/HClO<sub>4</sub>/PbO<sub>2</sub> reserve power sources. The potential of using tin–lead alloy POS 63 on copper substrates to manufacture anodes for chemical power sources is demonstrated.</p>","PeriodicalId":767,"journal":{"name":"Russian Journal of Physical Chemistry A","volume":"98 13","pages":"3227 - 3237"},"PeriodicalIF":0.7,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142994870","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Detection of Magnetocaloric Effects in BaFe11TiO19 Both Directly and Inversely BaFe11TiO19的正、反磁热效应检测
IF 0.7 4区 化学
Russian Journal of Physical Chemistry A Pub Date : 2025-01-17 DOI: 10.1134/S0036024424702728
Mahmoud A. Hamad, Hatem R. Alamri
{"title":"Detection of Magnetocaloric Effects in BaFe11TiO19 Both Directly and Inversely","authors":"Mahmoud A. Hamad,&nbsp;Hatem R. Alamri","doi":"10.1134/S0036024424702728","DOIUrl":"10.1134/S0036024424702728","url":null,"abstract":"<p>We report on simulations of BaFe<sub>11</sub>TiO<sub>19</sub>’s magnetocaloric effect (MCE) at temperatures between about 4 and 250 K. The MCE in BaFe<sub>11</sub>TiO<sub>19</sub> unexpectedly displays two forms. Among 33 and 204 K, BaFe<sub>11</sub>TiO<sub>19</sub> shows an inverse MCE due to noncollinear ordering. But when the FM goes from 4 to 33 K or over 204 K, a direct MCE is employed. BaFe<sub>11</sub>TiO<sub>19</sub>’s advantages may be useful in the hunt for magnetocaloric compounds that exhibit two or more successive magnetic phase changes. BaFe<sub>11</sub>TiO<sub>19</sub> is therefore a very promising magnet for cryogenic refrigeration, with potential uses in the liquefaction and storage of various gases.</p>","PeriodicalId":767,"journal":{"name":"Russian Journal of Physical Chemistry A","volume":"98 13","pages":"3238 - 3241"},"PeriodicalIF":0.7,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142994872","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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