Journal of Sol-Gel Science and Technology最新文献

{"title":"Negative differential resistance in amorphous carbon/zirconium oxide nanocomposites: mechanisms and characterisation","authors":"Wrida Ahmed,&nbsp;Achraf Rouine,&nbsp;Hajer Jeidi,&nbsp;Mohamed Noissria,&nbsp;Mohsen Erouel,&nbsp;Lassaad El Mir","doi":"10.1007/s10971-025-06878-3","DOIUrl":"10.1007/s10971-025-06878-3","url":null,"abstract":"<p>Devices exhibiting negative differential resistance (NDR) characteristics are fundamental in constructing many electronic components, where NDR plays a crucial role in various power electronic applications. This study presents a ground-breaking development in our continuous exploration of NDR behaviour observed in nanocomposites. These devices are synthesised using an economical and straightforward sol-gel technique. We focused on a pyrogallol formaldehyde (PF) matrix enriched with zirconium oxide (ZrO₂) nanopowder. Our approach involved incorporating an amount of ZrO₂ nanopowder into the carbon matrix, with the additive weight set at 10% of the PF matrix mass ratio. Initially, ZrO₂ nanoparticles were synthesised and embedded within (PF) host matrix using the sol-gel method under atmospheric conditions. Subsequently, PF/ZrO₂ nanocomposites were produced through a straightforward pyrolysis process, conducted for 2 h at the predetermined temperature in an inert atmosphere. Then, the structural, morphological, and electrical properties of the zirconium oxide/carbon nanocomposites (PFZr) were investigated. The analyses confirm the successful incorporation of nanosized zirconium particles into the organic matrix. Electrical conductivity measurements show a temperature-dependent transformation from an insulating xerogel to conductive carbon particles during pyrolysis, indicating the formation of continuous conducting channels. In addition, current-voltage (<i>I-V</i>) characteristics exhibit a promising (NDR) phenomenon, assigned to the Joule heating effect. This study also explores various prepared and measured parameters influencing the NDR response. This work highlights the potential of PFZr nanocomposites as a smart material for future technologies.</p>","PeriodicalId":664,"journal":{"name":"Journal of Sol-Gel Science and Technology","volume":"115 3","pages":"1650 - 1664"},"PeriodicalIF":3.2,"publicationDate":"2025-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144926986","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}

{"title":"Effect of lanthanum doping on structural and optical properties of K0.5Bi0.5TiO3 ceramics prepared by sol–gel technique","authors":"Saloni Bhardwaj,&nbsp;Shammi Kumar,&nbsp;Nagesh Thakur","doi":"10.1007/s10971-025-06873-8","DOIUrl":"10.1007/s10971-025-06873-8","url":null,"abstract":"<div><p>Lanthanum doped K_0.5(Bi_1−x a_x)_0.5TiO₃ at x = 0.0, 0.1, 0.2, and 0.3 ceramics are prepared by using solution based sol-gel route. The effect of lanthanum doping on structural and optical parameters of K_0.5Bi_0.5TiO₃ ceramics has been investigated systematically. X-ray diffraction analysis confirmed the formation of perovskite phase crystallized in tetragonal structure (space group P4mm) and incorporation of lanthanum ions in the crystal lattice. Raman study reveals significant changes in vibrational mode of lanthanum doped KBT ceramics with increase in lanthanum ions concentrations. The various optical parameters such as optical band gap, Urbach energy, refractive index and extinction coefficient have been investigated by using UV-visible spectroscopy. The direct optical bandgap of ceramics are analysed by using Tauc’s plots and decrease with increase in lanthanum ions concentration.</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":664,"journal":{"name":"Journal of Sol-Gel Science and Technology","volume":"115 3","pages":"1665 - 1676"},"PeriodicalIF":3.2,"publicationDate":"2025-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144927089","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}

{"title":"Sol-gel developed spinel MgFe2O4 magnetic nanomaterials: impact of samarium doping on the structural, morphological, optical, magnetic, and antibacterial traits","authors":"Rohit Jasrotia,&nbsp;Anis Ahmad Chaudhary,&nbsp;Swati Kumari,&nbsp;Basant Lal,&nbsp;Anand Sharma,&nbsp; Suman,&nbsp;Hassan Ahmad Rudayni,&nbsp;Pawan Kumar","doi":"10.1007/s10971-025-06868-5","DOIUrl":"10.1007/s10971-025-06868-5","url":null,"abstract":"<div><p>By employing an advanced sol-gel auto-combustion (SGC) method, we successfully fabricated the nanoscale spinel ferrites of chemical composition, MgSm_xFe_2-xO₄ (x = 0.0–0.2). A detailed structural analysis showed the defining attributes of the crystal structure of pure and doped magnesium ferrites. XRD study showed that the prepared samples exhibit the cubic phase along with the ortho-ferrite phase and also, there was a decline in crystallite size ranging from 42.67 to 32.89 nm with Sm doping. Using the FESEM analysis, the grain size was found to be 117.32 and 71.64 nm for MgFe₂O₄ and MgSm_0.02Fe_1.98O₄, respectively. FTIR spectra show two distinctive absorption bands of the prepared ferrites; the first was between 537 to 564 cm⁻¹ and the second between 403 to 437 cm⁻¹. Six Raman-active vibrational modes confirmed the cubic structure of the prepared magnesium spinel ferrites. The oxidation states of the different cations within the materials were also analysed by the XPS study. Magnetic analysis revealed an anomalous trend in magnetic parameters because of the A-B site interactions. The dM/dH analysis confirmed the multi-domain nature of the prepared samples. In addition, the undoped MgFe₂O₄ and doped MgSm_0.1Fe_1.90O₄ samples produced significant zone of inbition (ZOI) against both the <i>P. aeruginosa</i> and <i>Staphylococcus aureus</i> bacterial strains. Thus, the tailored magnetic, antibacterial and the crystal structure traits of the MgSm_xFe_2-xO₄ spinel ferrites make them promising candidates for the magnetic storage, and the antibacterial applications. The ehanced surface area also enable their potential use in catalysis and water treatment.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":664,"journal":{"name":"Journal of Sol-Gel Science and Technology","volume":"115 3","pages":"1598 - 1612"},"PeriodicalIF":3.2,"publicationDate":"2025-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144926985","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}

{"title":"Enhanced antibacterial efficacy of Ag@ZnTiO₃ nanocomposites: green synthesis using Gaga leaf extract and mechanistic insights","authors":"Amit Vasantrao Choudhari,&nbsp;Sudip Mondal,&nbsp;Pavan Bhilkar,&nbsp;Manoj Kumar,&nbsp;Pranali Hadole,&nbsp;Ratiram G. Chaudhary,&nbsp;Mohd Abul Kalam,&nbsp;Mohd Afzal,&nbsp;Aniruddha Mondal","doi":"10.1007/s10971-025-06865-8","DOIUrl":"10.1007/s10971-025-06865-8","url":null,"abstract":"<div><p>The rise of multidrug-resistant bacterial strains has created an urgent need for alternative antimicrobial agents. In this study, we report the green synthesis of mesoporous Ag@ZnTiO₃ nanocomposites using ethanolic leaf extract of the Gaga plant. The synthesized materials were characterized for structural and morphological features and evaluated for antibacterial activity against both Gram-positive and Gram-negative bacteria. The antibacterial performance of the mesoporous Ag@ZnTiO₃ nanocomposites was evaluated against both Gram-positive <i>Staphylococcus aureus</i> and Gram-negative <i>Escherichia coli</i> bacteria using disk diffusion and minimum inhibitory concentration (MIC) methods. Mechanistic insights revealed that the antibacterial mechanism involves reactive oxygen species (ROS) mediated oxidative stress, membrane disruption, and inhibition of cellular processes, leading to bacterial cell death. Mesoporous Ag@ZnTiO₃ nanocomposites demonstrate excellent antibacterial efficacy and stability, making them a promising candidate for next-generation antimicrobial agents in medical and environmental applications. In addition, a One-way ANOVA study revealed that the plant-synthesized nanocomposite exhibited a significantly greater antibacterial effect on the Gram-negative bacterial strain compared to the Gram-positive strain. The <i>p</i>-values less than 0.05 (<i>p</i> &lt; 0.05) indicate the statistical significance of the model terms. Further studies on scalability and long-term safety are recommended to pave the way for practical implementations.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":664,"journal":{"name":"Journal of Sol-Gel Science and Technology","volume":"115 3","pages":"1636 - 1649"},"PeriodicalIF":3.2,"publicationDate":"2025-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144927141","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}

{"title":"Dual-functionality of terbium-doped MoO3 semiconductor nanomaterials for degradation of synthetic textile dyes and antimicrobial activity","authors":"Divya T,&nbsp;Vishalee S,&nbsp;Prashanna Suvaitha S,&nbsp;Venkatachalam K","doi":"10.1007/s10971-025-06869-4","DOIUrl":"10.1007/s10971-025-06869-4","url":null,"abstract":"<div><p>Terbium-doped MoO₃ (Tb/MoO₃) nanoparticles were synthesized via a green method using <i>Adenanthera pavonina</i> leaf extract. Structural, optical, and morphological properties were investigated using X-ray diffraction, Fourier-Transform Infrared, Thermogravimetric, UV-Visible Diffuse Reflectance Spectroscopy, Transmission Electron Microscopy, Scanning Electron Microscopy – Energy Dispersive X-ray, and X-ray Photoelectron Spectroscopy analyses. TEM images revealed agglomerated spherical particles with an average size of ~19 nm. Tb doping reduced crystallinity and narrowed the band gap to 2.1 eV, enhancing visible light absorption. Photocatalytic degradation of Congo red, Brilliant green, and Nile blue A dyes achieved efficiencies of 87.6%, 90.8%, and 86.4% respectively within 120 min, following pseudo-first-order kinetics. Antibacterial studies showed strong inhibition against <i>Staphylococcus aureus</i> and <i>Pseudomonas aeruginosa</i>, with zones up to 20 mm, attributed to ROS-mediated membrane disruption. The catalyst retained ~80% efficiency after five reuse cycles. These findings confirm the dual-functional potential of Tb/MoO₃ for sustainable wastewater treatment and antimicrobial applications.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":664,"journal":{"name":"Journal of Sol-Gel Science and Technology","volume":"115 3","pages":"1613 - 1635"},"PeriodicalIF":3.2,"publicationDate":"2025-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144926965","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}

{"title":"Novel bio-inspired fabrication of BiVO4 nanoparticles and their solar light-aided photocatalytic activity for metronidazole antibiotic degradation","authors":"Yogita Abhale,&nbsp;Kajalben Patel,&nbsp;Ruhit Kumar Paul,&nbsp;Soumya Ranjan Mishra,&nbsp;Saptarshi Roy,&nbsp;Md. Ahmaruzzaman,&nbsp;Tan Kar Ban,&nbsp;Deepak Kumar,&nbsp;Suresh Ghotekar","doi":"10.1007/s10971-025-06872-9","DOIUrl":"10.1007/s10971-025-06872-9","url":null,"abstract":"<div><p>A popular natural sweetener with a long history of ethnomedical uses dating back to ancient civilizations, honey is a viscous liquid with an amber tint noted for its abundance of bioactive components. This investigation used a honey solution containing bioactive phytoconstituents to create bismuth vanadate nanoparticles (BiVO₄ NPs) for the first time. XRD, UV-Vis, FTIR, TEM, SAED pattern, SEM, EDX mapping, XPS, EIS, and BET studies highlighted the physicochemical features of as-prepared BiVO₄ NPs. XRD verified the biogenic synthesis of NPs, demonstrating a monoclinic scheelite structure with single-phase purity in the produced material. FTIR peaks at 1315 cm^‒1 and 1148 cm^‒1 indicate protein structures in the green source-mediated BiVO₄ NPs. Biosynthesized BiVO₄ NPs exhibit a quasi-spherical morphology with a median particle size of 25.74 nm. Moreover, the photocatalytic efficacy was disclosed by assessing the degradation rate of metronidazole, and various parameters influencing catalytic performance were investigated to attain maximum degradation efficiency. In a mere forty minutes, honey-mediated BiVO₄ NPs demonstrated substantial degradation of the metronidazole drug under solar light, accomplished an optimal degradation of 71.04% under the reaction conditions of 0.4 mL H₂O₂, 0.5 g/L catalyst, and 10 mg/L metronidazole concentration. Furthermore, the scavenging test was used to identify the radicals implicated in metronidazole degradation in the presence of a BiVO₄ photocatalyst. This study indicates that BiVO₄ NPs have significant potential for ecological restoration using photocatalysis.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":664,"journal":{"name":"Journal of Sol-Gel Science and Technology","volume":"115 3","pages":"1580 - 1597"},"PeriodicalIF":3.2,"publicationDate":"2025-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144926948","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}

{"title":"Growth of Y3+ doped CeO2 films and their structural, optical, photoluminescence, and gas sensing studies","authors":"Mohamed Benghanem,&nbsp;Zubair Ahmad,&nbsp;Mohd. Shkir,&nbsp;Thamraa Alshahrani","doi":"10.1007/s10971-025-06860-z","DOIUrl":"10.1007/s10971-025-06860-z","url":null,"abstract":"<div><p>In the recent past, the development of sensors for harmful gas sensing has been in great demand. Hence, herein, the (0, 1, 2, 3, 4, &amp; 5 wt.%) Yttrium(III)-doped CeO₂ thin films were synthesized using the Nebulizer-assisted spray pyrolysis method for ammonia gas sensing applications. The films exhibited a polycrystalline structure with a cubic phase and a porous morphology, indicating homogeneous crystallization. The surface roughness of the films were increased with Yttrium doping concentration, attributed to the incorporation of Yttrium ions into the Ce sites of CeO₂. UV-Vis-NIR spectroscopy revealed an enhanced absorption in the red region, suggesting the presence of free electrons, which are beneficial for gas sensing. The Yttrium-doped CeO₂ films showed a reduced band gap, thus enhancing their suitability for gas sensing applications. Photoluminescence studies confirmed the presence of free electrons with a sharp blue emission peak at 478 nm, suggesting its application as blue LED. Gas sensing tests demonstrated an increased current value with higher NH₃ concentrations, with the 3% Y-doped CeO₂ thin film showing the best performance. Repeatability tests confirmed a stable gas response over 15 cycles at 250 ppm NH₃, ensuring the reliability and long-term stability of the 3% Yttrium-doped CeO₂ thin film as an effective and durable gas sensing material for industrial applications.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":664,"journal":{"name":"Journal of Sol-Gel Science and Technology","volume":"115 3","pages":"1567 - 1579"},"PeriodicalIF":3.2,"publicationDate":"2025-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144926981","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}

{"title":"Magnetically enhanced ZnFe2O4 nanocomposite: a promising antibacterial, and antioxidant strategies","authors":"Mahdi A. Mohammed,&nbsp;Waleed K. Abdulkadhim,&nbsp;Kareem. H. Jawad,&nbsp;Salim Albukhaty,&nbsp;Majid S. Jabir,&nbsp;Suresh Ghotekar,&nbsp;Ayman A. Swelum","doi":"10.1007/s10971-025-06870-x","DOIUrl":"10.1007/s10971-025-06870-x","url":null,"abstract":"<div><p>The present study aimed to synthesize zinc ferrite nanoparticles (ZnFe₂O₄ NPs) using the sol-gel method and evaluate their antibacterial properties against <i>Escherichia coli</i> (<i>E. coli</i>) and <i>Staphylococcus aureus</i> (<i>S. aureus</i>), along with an assessment of their antioxidant activity. Characterization, including X-ray diffraction (XRD) analysis, confirmed that the nanoparticles exhibited a face-centered cubic (FCC) crystalline structure. Transmission electron microscopy (TEM) revealed that the nanoparticles were spherical in shape, with an estimated size ranging from approximately (~30–60 nm). The magnetic properties were investigated using a vibrating sample magnetometer (VSM), while Fourier-transform infrared spectroscopy (FTIR) identified the functional groups present. Notably, this study presents a novel approach by demonstrating, for the first time, the enhanced antibacterial efficacy of ZnFe₂O₄ nanoparticles under an alternating magnetic field (AMF), highlighting their unique DNA-mediated mechanism of action. Furthermore, the ZnFe₂O₄ NPs exhibited sustained antioxidant activity as measured by the DPPH assay. These combined antioxidant and AMF-enhanced antibacterial properties suggest promising pharmacological and biomedical applications for ZnFe₂O₄ NPs, particularly in the development of magnetically responsive therapeutic agents. Notably, this study presents a novel approach by demonstrating, for the first time, the enhanced antibacterial efficacy of ZnFe₂O₄ nanoparticles under an alternating magnetic field (AMF), highlighting their unique DNA-mediated mechanism of action. Furthermore, the ZnFe₂O₄ NPs exhibited sustained antioxidant activity as measured by the DPPH assay. These combined antioxidant and AMF-enhanced antibacterial properties suggest promising pharmacological and biomedical applications for ZnFe₂O₄ NPs, particularly in the development of magnetically responsive therapeutic agents.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":664,"journal":{"name":"Journal of Sol-Gel Science and Technology","volume":"115 3","pages":"1557 - 1566"},"PeriodicalIF":3.2,"publicationDate":"2025-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144926984","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}

{"title":"Exploring the cell-toxic potential of biosynthesized silver-magnetite nanocomposites using Peganum harmala aqueous extract on HT-29 colon cancer cells","authors":"Younes Mousavi majd,&nbsp;Amir Arasteh,&nbsp;Ahmad Molaei Rad,&nbsp;Mehdi Ebrahimi","doi":"10.1007/s10971-025-06864-9","DOIUrl":"10.1007/s10971-025-06864-9","url":null,"abstract":"<div><p>Because of their unique physicochemical properties and biological activities, nanocomposites have developed as promising therapeutic active ingredients. This study aimed to examine the synthesis, characterization, and biological effects of green-synthesized silver magnetite nanocomposites using <i>P. harmala</i> aqueous extract (Harmala Ag-Fe₃O₄ NCs), with a particular focus on their antioxidant, anticancer, and anti-Alzheimer’s characteristics. Harmala Ag-Fe₃O₄ NCs were synthesized by a green method and characterized using UV-Vis, FTIR, XRD, DLS, and Zeta potential techniques. The magnetic properties were analyzed using VSM (vibrating sample magnetometry). The surface morphology and the elemental composition were examined using FESEM (field emission scanning electron microscopy) and EDAX (energy-dispersive X-ray analysis). The antioxidant activity was evaluated using DPPH, and anticancer effects were evaluated by MTT assay on HT-29 colorectal cancer cells. The anti-amyloidogenic potential was examined by spectrofluorimetry and confirmed by TEM images. UV-Vis, FTIR, and XRD methods confirmed the formation of silver magnetite nanocomposites. The FESEM images showed a nanogranular distribution, and VSM analysis indicated that the sample had low hysteresis, requiring less magnetic field for demagnetization. Harmala Ag-Fe₃O₄ NCs showed strong inhibitory effects on amyloids, with the highest antioxidant activity (78%) observed at 10 mg/ml, and maximum anticancer effects observed at 500 µg/ml. This study shows that Harmala Ag-Fe₃O₄ NCs have significant antioxidant, anti-Alzheimer’s, and anticancer properties, indicating their potential therapeutic applications in cancer treatment and neurodegenerative diseases.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":664,"journal":{"name":"Journal of Sol-Gel Science and Technology","volume":"115 3","pages":"1542 - 1556"},"PeriodicalIF":3.2,"publicationDate":"2025-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144926980","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}

{"title":"Probing the effects of pH and sintering temperature on the structure and magnetic properties of La0.833Ag0.167MnO3","authors":"Smitha Joseph,&nbsp;Roshan Jose,&nbsp;D. Sajan","doi":"10.1007/s10971-025-06866-7","DOIUrl":"10.1007/s10971-025-06866-7","url":null,"abstract":"<div><p>This work highlights the effects of pH and sintering temperature modifications on the structural, magnetic and magneto-transport properties of La_0.833Ag₀.₁₆₇MnO₃, prepared by sol-gel route. The structural studies revealed that all the pH varied samples crystallized in R<i>-3c</i> space group. Minor impurity phases of Ag and Mn₃O₄ were detected in the XRD patterns of the samples synthesized at lower pH. Phase quantification by Rietveld refinement revealed that the concentration of impurity phases showed an inverse relation to pH. The existence of impurity phase is effectively elucidated, using the concept of chelating property of citric acid. FESEM analysis indicated that pH variation had no significant effect on the particle size; however, the grain size is gravely affected by sintering temperature. Magnetic studies showed that pH variation have negligible effect and all the samples exhibited ferromagnetic nature, with T_C = 297 ± 2 K. Transport studies revealed that the material resistivity is strongly modified by variations in both pH and sintering temperature. Double metal insulator transition (MIT) peak, which is an inherent feature on the transport curve, becomes increasingly discernible with the enhancement in pH. All the pH varied samples exhibited very high magnetoresistance proprty, irrespective of Ag and Mn₃O₄ impurity phases. The present study emphasize that phase purity of La_0.833Ag₀.₁₆₇MnO₃ is strongly dependent on pH of the precursor. The study showed that for single phase well crystallized sample, pH &gt; 10 and sintering temperature 1273 K is ideal. The magnetotransport property of the samples in the low temperature regime is comprehended on the basis of spin polarized tunneling model, while in the high temperature regime, percolation model is employed.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":664,"journal":{"name":"Journal of Sol-Gel Science and Technology","volume":"115 3","pages":"1510 - 1529"},"PeriodicalIF":3.2,"publicationDate":"2025-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144926979","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}