Journal of Solid State Chemistry最新文献

{"title":"Structure-property relationships in morpholinium hexahalostannate(IV) hybrid materials: Impact of halide substitution on optical and nonlinear responses","authors":"Pirnazar Kodamboevich Kodamboev ,&nbsp;Hela Ferjani ,&nbsp;Yasmeen G. Abou El-Reash ,&nbsp;Tarek A. Yousef ,&nbsp;Ikrom Iskandarovich Abdullaev ,&nbsp;Loganathan Guganathan ,&nbsp;Takhirov Yuldash Rajabovich ,&nbsp;Elyorbek Shonazar ugli Samandarov ,&nbsp;Aziz Bakhtiyarovich Ibragimov ,&nbsp;Chellakarungu Balakrishnan","doi":"10.1016/j.jssc.2025.125665","DOIUrl":"10.1016/j.jssc.2025.125665","url":null,"abstract":"<div><div>Two novel morpholinium-based organic-inorganic hybrid halostannates, (MorphH₂)SnCl₆.2Cl, (1), and (MorphH₂)SnBr₆.2H₂O (2), {(Morph)= (4-(2-ammonioethyl)morpholin-4-ium)} were synthesized using slow evaporation at room temperature technique and carefully characterized. Single-crystal X-ray diffraction validated nearly perfect octahedral geometries surrounding the Sn(IV) centers in both compounds. The Hirshfeld surface and 2D-fingerprintplot analysis indicated predominant halogen and hydrogen bonding, which enhances supramolecular stability. Optical tests revealed a notable halide-dependent redshift in the direct band gap, diminishing from 4.36 eV (Cl⁻) to 2.99 eV (Br⁻), with photoluminescence investigations supporting this observation. Z-scan measurements revealed significant third-order nonlinear optical (NLO) responses, with χ⁽³⁾ values of 9.22 × 10⁻¹² esu for sample (1) and an exceptional 5.00 × 10⁻¹¹ esu for sample (2). Moreover, frequency and temperature-dependent dielectric analysis elucidated space charge and dipolar relaxation mechanisms. These findings highlight the efficacy of halide substitution, hydration state and crystal symmetry in modulating the structural and functional characteristics of tin-based hybrids, establishing them as viable candidates for photonic, nonlinear optical, and dielectric device applications.</div></div>","PeriodicalId":378,"journal":{"name":"Journal of Solid State Chemistry","volume":"353 ","pages":"Article 125665"},"PeriodicalIF":3.5,"publicationDate":"2025-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145057263","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Engineering cation vacancy defects on LaNiO3 for efficient oxygen evolution reaction","authors":"Ravi K. Kunchala ,&nbsp;Rohit Ranjan Raut Ray ,&nbsp;Srijoti Mukherjee ,&nbsp;Ashok K. Ganguli","doi":"10.1016/j.jssc.2025.125663","DOIUrl":"10.1016/j.jssc.2025.125663","url":null,"abstract":"<div><div>Perovskite oxides (ABO₃) have been extensively studied as electrocatalysts for the oxygen evolution reaction (OER) due to their highly tunable and flexible electronic structures. However, their practical use as electrocatalysts has been hindered by limitations such as less surface area and low electrical conductivity. In this work LaNiO₃ (LNO) perovskite oxides were synthesized and modified by selectively removing A-site cations by etching with dilute acetic acid treatment. This acid etching process induced cation and oxygen vacancies, resulting in an increased surface area, and enhanced surface wettability, facilitating improved interaction with water molecules thereby promoting a higher density of catalytically active sites. These structural and surface modifications led to superior OER performance in alkaline media. The optimized catalyst, LNO-3M, demonstrated a reduced overpotential, smaller Tafel slope, higher turnover frequency, and greater mass activity compared to pristine LNO. Electrochemical measurements confirmed faster charge transfer and a higher density of active sites due to the increased electrochemical surface area. Furthermore, LNO-3M maintained excellent operational stability over extended periods. This study underscores the efficacy of a simple acid etching strategy to enhance the catalytic activity of LaNiO₃ for efficient water splitting applications.</div></div>","PeriodicalId":378,"journal":{"name":"Journal of Solid State Chemistry","volume":"353 ","pages":"Article 125663"},"PeriodicalIF":3.5,"publicationDate":"2025-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145046672","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Highly efficient and dual-functional photochemical elimination of Cr2O72− and reactive dyes via fabrication of a novel S-scheme binary heterojunction In2S3/In-MOF","authors":"Zhou-Cao Ye ,&nbsp;Jie Liu ,&nbsp;Jie Duan ,&nbsp;Wei-Li Zhai ,&nbsp;Xian Wang ,&nbsp;Qing Li ,&nbsp;Wei Zhu","doi":"10.1016/j.jssc.2025.125649","DOIUrl":"10.1016/j.jssc.2025.125649","url":null,"abstract":"<div><div>Photocatalytic elimination of highly toxic Cr₂O₇²⁻ and stubborn reactive dyes requires photocatalysts to exhibit both robust oxidation and reduction capabilities. However, most single MOFs must utilize ultraviolet light and are incapable of concurrently providing sufficiently negative LUCO and positive HUCO potentials. In the current contribution, a water-stable In-MOF featured by typical n-type semiconductor was assembled and subsequently integrated with the <em>in-situ</em> growth In₂S₃ to construct a novel In₂S₃/In-MOF binary heterojunction. Notably, the intrinsic LUCO (−0.43 eV, vs. NHE) and HOCO (2.77 eV, vs. NHE) energy levels of deployed In-MOF exhibit a suitable band dislocation with In₂S₃'s CB (−0.85 eV, vs. NHE) and VB (1.43 eV, vs. NHE) potentials. And this integration facilitates the establishment of an S-Scheme carrier transfer mechanism, effectively inhibiting carriers recombination and ensuring the efficient utilization of the robust redox abilities offered by In₂S₃'s CB and In-MOF's HOCO. Under the driven of a low-energy xenon lamp, In₂S₃/In-MOF's optical-electrical properties involving photosensitiveness, photocurrent intensity and interface resistance have been notably improved. M55, with a feed mass ratio of In-MOF to In₂S₃ at 5 : 5, achieved a 99.9 % reduction efficiency for Cr(VI) within 80 min, degradation efficiencies of 77 % and 82 % for reactive dyes RB21 and RR2 within 12 h, respectively. Its reaction kinetics have increased by 8.79, 17.82 and 14.55 times compared to the pristine In-MOF, and by 1.66, 4.60 and 17.57 times relative to pure In₂S₃. This contribution offers a viable avenue for designing novel MOFs-based photocatalysts, which possess robust reducing and oxidizing capabilities, to address some intractable water pollution issues.</div></div>","PeriodicalId":378,"journal":{"name":"Journal of Solid State Chemistry","volume":"353 ","pages":"Article 125649"},"PeriodicalIF":3.5,"publicationDate":"2025-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145047151","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Dual organic linkers-mediated construction of cobalt-based metal-organic frameworks with tunable channel structures for lithium ion storage","authors":"Gang Sun ,&nbsp;Peng Li ,&nbsp;Jun Chen ,&nbsp;Chunsu Zhang ,&nbsp;Meng-Ting Li","doi":"10.1016/j.jssc.2025.125658","DOIUrl":"10.1016/j.jssc.2025.125658","url":null,"abstract":"<div><div>Metal-organic frameworks (MOFs) have emerged as promising anode materials for lithium-ion batteries due to their ability to provide ordered and stable lithium-ion transport channels. Additionally, the highly uniform distribution of active sites within their pores facilitates effective interactions with lithium ions, enhancing both the lithium-ion storage capacity and adsorption kinetics of the material. Based on these advantages, we designed and synthesized two supramolecular structures using the hexadentate rigid organic ligand 4,4′,4″-s-triazine-2,4,6-triyltribenzoic acid (TBA) in combination with different N-donor ligands as secondary auxiliary ligands. The resulting compounds, [Co(TBA)(bpy)]·H₂O (Co-TBA-bpy) and [Co₃(TBA)₂(phen)₃(H₂O)₃]·4H₂O (Co-TBA-phen), exhibit layered and porous supramolecular architectures, respectively. The dual-ligand strategy enables effective modulation of MOF structure and electrochemical performance.</div></div>","PeriodicalId":378,"journal":{"name":"Journal of Solid State Chemistry","volume":"353 ","pages":"Article 125658"},"PeriodicalIF":3.5,"publicationDate":"2025-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145047147","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Water glass-based aerogel monolith prepared with formamide catalyst and SiO2 nanofiber reinforcement: Nanoarchitectonics and enhanced mechanical property","authors":"Jun Liu,&nbsp;Qiu-Yu Hu,&nbsp;Meng-Jie Chang,&nbsp;Xin Li,&nbsp;Shi-Shun Cao","doi":"10.1016/j.jssc.2025.125651","DOIUrl":"10.1016/j.jssc.2025.125651","url":null,"abstract":"<div><div>Water glass-based aerogels (WAGs) are poor in mechanical properties, which seriously limits their application. At the same time, the strong acid used for the gelation of water glass is corrosive to equipment. In this work, water glass-based aerogel monolith with significantly improved mechanical property were prepared with flexible electrospun SiO₂ nanofibers (SNF) as reinforcing agents and formamide (FA) as the hydrolysis catalyst (SNF/WAG). The introduced SNF can reduce the density and shrinkage of the aerogel, which are decreased to 8.9 % and 0.107 g cm⁻³ for the SNF/WAG-2, respectively. Most importantly, the introduction of SNF can transform the brittle structure of WAG into the plastic structure of SNF/WAG, improving its mechanical properties. The high adsorption capacity for CH₂Cl₂ (11.33 g g⁻¹) enables SNF/WAG to serve as an efficient oil absorbent material. Owing to the low density, hydrophobicity and good insulation, the evaporator assembled with SNF/WAG as insulator exhibits evaporation rates of 1.932, 2.622, and 3.082 kg m⁻² h⁻¹ at 1, 2, and 3 sun illumination, and the evaporation rate can still be maintained at 1.728 kg m⁻² h⁻¹ after 5 cycles at 1 sun intensity. This study offers a feasible approach to overcome the key limitations of conventional water glass-based aerogels. It significantly enhances the overall material performance while maintaining low-cost preparation, thus paving the way for broader application of aerogels in areas such as high-strength thermal insulation.</div></div>","PeriodicalId":378,"journal":{"name":"Journal of Solid State Chemistry","volume":"353 ","pages":"Article 125651"},"PeriodicalIF":3.5,"publicationDate":"2025-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145027601","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Preparation and transport properties of Ba3Nb2O8 hexagonal perovskite-derivative oxide","authors":"Yongcun Liu ,&nbsp;Hui Guo ,&nbsp;Lulu Jiang ,&nbsp;Sara Adeeba Ismail ,&nbsp;Donglin Han","doi":"10.1016/j.jssc.2025.125654","DOIUrl":"10.1016/j.jssc.2025.125654","url":null,"abstract":"<div><div>Hexagonal perovskite-derivatives attract increasing attention due to their high oxide ion conductivity at high temperature. In this work, pristine Ba₃Nb₂O₈ was chosen as the research target, since this composition is the cornerstone for some fast oxide ion conductors like Ba₃MoNbO_8.5. The knowledge on preparation and transport properties of Ba₃Nb₂O₈ is thereby valuable to the further design of excellent oxide ion conductors. The parameters for the solid-state reaction method to prepare a Ba₃Nb₂O₈ single phase were studied, and the optimal temperature and time for sintering were found to be 1200 °C and 36–48 h, respectively. By exposing to a humid atmosphere, Ba₃Nb₂O₈ can be hydrated to activate proton conduction, which is evidenced by higher bulk conductivity in the wet atmosphere and observation of H₂O/D₂O isotope. The transport number of proton conduction is further determined by electromotive force measurements to be around 0.6 at 500 °C and decreases with the increasing temperature.</div></div>","PeriodicalId":378,"journal":{"name":"Journal of Solid State Chemistry","volume":"353 ","pages":"Article 125654"},"PeriodicalIF":3.5,"publicationDate":"2025-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145047145","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Ion-selective change storage in three types layered MnO2 films intercalated with different cobalt complexes","authors":"Ryota Sugawara ,&nbsp;Ryosuke Okawa ,&nbsp;Ryo Sasaki ,&nbsp;Mayumi Abe ,&nbsp;Kazuaki Tomono","doi":"10.1016/j.jssc.2025.125659","DOIUrl":"10.1016/j.jssc.2025.125659","url":null,"abstract":"<div><div>In this study, layered MnO₂ films intercalated with three types of cobalt complexes; [Co(en)₃], <em>trans</em>-[Co(en)₂Cl₂], and <em>cis</em>-[Co(en)₂Cl₂] were prepared on FTO substrates, forming [Co(en)₃]@MnO₂, <em>trans</em>-[Co(en)₂Cl₂]@MnO₂, and <em>cis</em>-[Co(en)₂Cl₂]@MnO₂, respectively. XRD, EDS, FT-IR, and Raman results confirmed the preparation of layered MnO₂ films with the respective cobalt complexes in the interlayer. Electrochemical measurements (cyclic voltammetry; CV) in Na₂SO₄ electrolyte showed that [Co(en)₃]@MnO₂ film (262 F/g), <em>trans</em>-[Co(en)₂Cl₂]@MnO₂ film (226 F/g) and <em>cis</em>-[Co(en)₂Cl₂]@MnO₂ film (193 F/g), showing high cycle stability and capacitance. During CV measurements, the cobalt complex in [Co(en)₃]@MnO₂ was deintercalated and replaced by hydrated Na ⁺ ions, whereas in <em>trans</em>-[Co(en)₂Cl₂]@MnO₂ and <em>cis</em>-[Co(en)₂Cl₂]@MnO₂, the cobalt complexes retained in the interlayer. These results suggest that Na⁺ ions intercalation/deintercalation dominated in [Co(en)₃]@MnO₂, while SO₄²⁻ ions intercalation/deintercalation occurred in <em>trans</em>-[Co(en)₂Cl₂]@MnO₂ and <em>cis</em>-[Co(en)₂Cl₂]@MnO₂. The ionic property that Na ⁺ ions diffuse more easily in aqueous solution than SO₄²⁻ ions suggests that the [Co(en)₃]@MnO₂ film has a larger capacitance than the <em>trans</em>-[Co(en)₂Cl₂]@MnO₂ film and the <em>cis</em>-[Co(en)₂Cl₂]@MnO₂ film. Electrochemical impedance spectroscopy (EIS), [Co(en)₃]@MnO₂ exhibited a mixed response of capacitive and diffusive behavior associated with Na ⁺ replacement, with a linear region showing a slope of approximately 60° in the Nyquist plot. <em>trans</em>-[Co(en)₂Cl₂]@MnO₂ and <em>cis</em>-[Co(en)₂Cl₂]@MnO₂ showed two semicircles originating from surface and interlayer reactions, followed by a linear region with a slope of about 80°, reflecting surface-capacitive dominance. These features are consistent with the differences in the slope and phase angle observed in the Bode plots, indicating that the EIS response is influenced by ion diffusivity and interlayer structure.</div></div>","PeriodicalId":378,"journal":{"name":"Journal of Solid State Chemistry","volume":"353 ","pages":"Article 125659"},"PeriodicalIF":3.5,"publicationDate":"2025-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145046640","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Assembly of TM−Containing Polyoxotungstates−Based on Metal−Organic frameworks with catalytic oxidation performances for various sulfides","authors":"Yujiao Hou,&nbsp;Xiaojing Wang,&nbsp;Yifan Cheng,&nbsp;Hongyan Chen,&nbsp;Peilin Han","doi":"10.1016/j.jssc.2025.125655","DOIUrl":"10.1016/j.jssc.2025.125655","url":null,"abstract":"<div><div>The catalytic selectivity oxidation of sulfides to sulfoxides is the central organic reaction for future sustainable development. Herein, two remarkable polyoxotungstates−based on metal−organic frameworks, [{Ag₆(ptz)₄}{PW₁₂O₄₀}]·0.5H₂O and [{Cu₃(ptz)₃}{PW₁₂O₄₀}]·4H₂O (ptz = 5−(4−pridyl)−1H−tetrazole), were deliberately designed and isolated. In compound <strong>1</strong>, the {PW₁₂} polyoxoanions occupy the 1D big rectangular porous original from the 3D Ag−organic framework, constructing a fascinating 3D POMs−based 3D framework. Compound <strong>2</strong> exhibit a glamorous 2D sheet structure comprise of bicapped anions {PW₁₂} and 1D Cu−organic chains. Additionally, two compounds can be severed as the high−efficiency heterogeneous catalysts for the selective oxidation of sulfides. In particularly, compound <strong>1</strong> exhibits satisfying catalytic performance in the oxidation of MPS (conv. 97.5 %; sele. 99 %). Notedly, after five cyclic catalytic reaction, compound <strong>1</strong> maintains excellent catalytic performance and structural stability.</div></div>","PeriodicalId":378,"journal":{"name":"Journal of Solid State Chemistry","volume":"353 ","pages":"Article 125655"},"PeriodicalIF":3.5,"publicationDate":"2025-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145047146","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A flexible linker-based indium frameworks as highly efficient catalysts for carbon dioxide conversion","authors":"Sheli Zhang ,&nbsp;Yuerong Yan ,&nbsp;Huijie Shan ,&nbsp;Yunchang Fan ,&nbsp;Haibao Zhu","doi":"10.1016/j.jssc.2025.125650","DOIUrl":"10.1016/j.jssc.2025.125650","url":null,"abstract":"<div><div>The chemical fixation of carbon dioxide (CO₂) represents a viable strategy to achieve carbon neutrality. However, the conversion of CO₂ is still limited by the lack of efficient heterogeneous catalysts. To address this problem, a flexible linker-based metal-organic frameworks were synthesized using hard Lewis acid indium as metal center (In-MOFs) and their catalytic performance for the CO₂ cycloaddition with epoxides in the absence of solvent and co-catalyst was evaluated. Experimental results revealed that In-MOFs exhibited great catalytic activity (cyclic carbonate yield, 97.2 %) and selectivity (&gt;98 %) for the cycloaddition of CO₂ and epichlorohydrin (ECH) under mild conditions (80 °C for 5 h, 0.1 MPa CO₂) due to the strong Lewis acidity of In (III), which significantly lowered energy barrier of epoxide ring opening and the insertion of CO₂, consequently promoting the CO₂ cycloaddition reaction.</div><div>These results suggested that the In-MOFs exhibited promising potential as catalysts for the CO₂ chemical fixation and may provide a new approach for the fabrication of MOFs-based catalysts for the CO₂ conversion.</div></div>","PeriodicalId":378,"journal":{"name":"Journal of Solid State Chemistry","volume":"353 ","pages":"Article 125650"},"PeriodicalIF":3.5,"publicationDate":"2025-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145047148","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of high-temperature treatment with orthophosphoric acid on the phase composition, elemental composition, microstructure and electrical properties of calcium sulfate hemihydrate","authors":"Ivan Nikulin,&nbsp;Tatiana Nikulicheva,&nbsp;Vitaly Vyazmin,&nbsp;Oleg Ivanov,&nbsp;Nikita Anosov,&nbsp;Olga Telpova","doi":"10.1016/j.jssc.2025.125656","DOIUrl":"10.1016/j.jssc.2025.125656","url":null,"abstract":"<div><div>Citrogypsum, which is waste product of biochemical production of citric acid, has been applied to prepare bulk samples of calcium sulfate hemihydrate, CaSO₄∙0.5H₂O. The samples were undergone to high-temperature (95 °C) treatment in 85 wt% aqueous solution of orthophosphoric acid at different treatment times, <em>t</em>_<em>h</em> (<em>t</em>_<em>h</em> = 1; 3; 5; 7; 10 and 15 min). Due to interaction between CaSO₄∙0.5H₂O and H₂O from aqueous solution, at first treatment stage, the starting calcium sulfate hemihydrate quickly (at <em>t</em>_<em>h</em> &lt; 1 min) and completely transforms into calcium sulfate dihydrate, CaSO₄∙2H₂O. With further increase in <em>t</em>_<em>h</em>, phase composition of the samples changes from single-phased state with monoclinic CaSO₄∙2H₂O structure at <em>t</em>_<em>h</em> = 1min to two-phased state at <em>t</em>_<em>h</em> &gt; 1 min, in which new phase of calcium sulfate hemihydrate CaSO₄∙0.5H₂O with pseudo-trigonal structure is gradually forming from phase CaSO₄∙2H₂O. Formation of two-phased state is related to phase transformation, originated from partial removal of crystallization water molecules from the CaSO₄·2H₂O structure. During the acid treatment, in the samples content of Ca and S decrease, and content of P increases. These changes in elemental composition are governed by mechanisms of cation exchange (via partial replacement of Ca²⁺ cation by two H⁺ ions) and anion exchange (via partial replacement of acid group (SO₄)^2- by acid residue (HPO₄)^2-). Electrical properties of the samples were examined by analyzing of room-temperature voltage-current dependencies, recording at 50 Hz. Electrical conductivity of the samples are gradually increasing with increasing <em>t</em>_<em>h</em>. This effect can be related to appearance of mobile H⁺ ions in structure of the samples. Highest value of the conductivity is ∼0.058 S∙m⁻¹ for <em>t</em>_<em>h</em> = 15 min. Increase in the conductivity is accompanied by gradual increase in relaxational current contribution into total electric current. This feature can be originated from formation of acid residues (PO₄)^3-, which partially replace acid residue (SO₄)^2- in the CaSO₄ structure of the acid treated samples.</div></div>","PeriodicalId":378,"journal":{"name":"Journal of Solid State Chemistry","volume":"353 ","pages":"Article 125656"},"PeriodicalIF":3.5,"publicationDate":"2025-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145046671","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}