Ceramics International最新文献

{"title":"Enhanced electrical properties and depolarization temperature of BF-BT ceramics via Mn2+ and Sc3+ Co-doping and direct reaction sintering","authors":"Kai Liu ,&nbsp;Rongxia Huang ,&nbsp;Dijia Lin ,&nbsp;Junhui Tan ,&nbsp;Yejing Dai ,&nbsp;Hua-Tay Lin","doi":"10.1016/j.ceramint.2024.12.345","DOIUrl":"10.1016/j.ceramint.2024.12.345","url":null,"abstract":"<div><div>BiFeO₃-BaTiO₃ ceramics exhibit excellent thermal stability and outstanding electrical properties in the morphotropic phase boundary (MPB) region, making them a prominent focus of research of lead-free piezoelectric ceramics. However, the conventional sintering process often results in Bi volatilization and changes in the valence state of Fe ions, leading to high leakage current and difficulty in achieving a piezoelectric coefficient above 200 pC/N. In this study, we fabricated 0.7BiFeO₃-0.3BaTiO₃-0.1 mol% MnCO₃-<em>x</em> wt% Sc₂O₃ (BFM-BT-<em>x</em>Sc) piezoelectric ceramics using a direct reaction sintering method. We investigated the microstructure, electrical properties, and thermal stability of the BFM-BT-<em>x</em>Sc ceramics. Compared to single Mn²⁺ doping, the addition of Sc³⁺ significantly refined the grain size, suppressed the transition of Fe³⁺ to Fe²⁺, and reduced the concentration of oxygen vacancies, resulting in enhanced electrical properties of BFM-BT ceramics. The BFM-BT-0.2Sc ceramics exhibited excellent piezoelectric performance (<em>d</em>₃₃ = 208 pC/N, <em>d</em>₃₃ = 400 pC/N at 308 °C) and a high Curie temperature (<em>T</em>_c = 502 °C), with a resistivity of 1.69 × 10⁸ Ω cm at 200 °C. After optimizing the sintering temperature, the piezoelectric performance further improved, with <em>d</em>₃₃ reaching 228 pC/N, <em>d</em>₃₃ = 427 pC/N at 282 °C, and a resistivity of 5.9 × 10⁸ Ω cm at 200 °C. These findings indicate that BFM-BT-0.2Sc ceramics possess excellent high-temperature electrical properties, suggesting broad prospects for the co-doping of Mn²⁺ and Sc³⁺ in BF-BT-based piezoelectric ceramics for high-temperature applications.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 7","pages":"Pages 9131-9141"},"PeriodicalIF":5.1,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143510850","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"High efficiency removal of organic pollutant via the synergistic effect between adsorption and photocatalysis of rGO/TiO2/g-C3N4 composite aerogel","authors":"Yucao Yuan ,&nbsp;Yongqiang Niu ,&nbsp;Hongliang Xu ,&nbsp;Cheng Fang ,&nbsp;Wen Liu ,&nbsp;Bo Song ,&nbsp;Mingliang Li ,&nbsp;Gang Shao ,&nbsp;Hongxia Lu ,&nbsp;Hailong Wang ,&nbsp;Rui Zhang","doi":"10.1016/j.ceramint.2024.12.326","DOIUrl":"10.1016/j.ceramint.2024.12.326","url":null,"abstract":"<div><div>Three-dimensional (3D) rGO/TiO₂/g-C₃N₄ composite aerogels (CTG-V, V = 1, 2, 3, 4) were synthesized via the hydrothermal method by using TiO₂/g-C₃N₄ (CTO) and graphene oxide (GO) with a mass ratio of 1:1, 2:1, 3:1, and 4:1, respectively. The phase composition, microstructure, photo-electrical performance, the removal performance toward Rhodamine B (RhB), etc. of CTG-V were systematically investigated. The results showed that CTG-V exhibited a stable 3D structure, much higher light absorption ability, improved separation and migration efficiency of the photogenerated carriers in comparison to CTO. With the mass ratio of CTO to GO increasing, the adsorption reaction rate constants (k_a) of CTG-V decreased but their photocatalytic degradation reaction rate constants (k_p) increased gradually, and the adsorption-photocatalysis synergistic reaction rate constants (k_s) of CTG-V which increased firstly and then decreased, were higher than their single k_a values or k_p values. After 60 min of adsorption-photocatalysis synergistic degradation reaction, the removal rate of RhB (200 mL, 10 mg/L) reached 92.19 % by CTG-2 (0.1 g), which exhibited the optimum removal performance. The k_s value of CTG-2 (0.0273 min⁻¹) calculated by pseudo-first-order linear fitting was 11.38, 2.87 and 1.94 times that of bulk g-C₃N₄, g-C₃N₄ nanosheets and TiO₂/g-C₃N₄ composites, respectively. CTG-2 was easy to be separated and recycled from solution during the cycling experiments, and it presented excellent stability as it still removed 85.15 % of RhB molecules after five cycles of adsorption-photocatalysis synergistic reaction.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 7","pages":"Pages 8965-8979"},"PeriodicalIF":5.1,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143510856","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"NIR-Ⅱ fluorescence and thermometry properties in negative thermal expansion phosphor Sc2(MoO4)3","authors":"Xiuna Tian ,&nbsp;Youfeng Wen ,&nbsp;Hongjian Dou ,&nbsp;Lingyuan Wu ,&nbsp;Changjun Wang ,&nbsp;Youzi Zhang","doi":"10.1016/j.ceramint.2024.12.282","DOIUrl":"10.1016/j.ceramint.2024.12.282","url":null,"abstract":"<div><div>In the clinical diagnosis and treatment of diseases, there is an urgent need to find suitable materials for real-time temperature monitoring of biological tissues. The paper provides a detailed study of the effects of Nd³⁺ doping concentration on the negative thermal expansion performance and NIR fluorescence properties of Sc₂(MoO₄)₃. The results obtained from Rietveld refinement of in-situ XRD data indicates that high concentration of Nd³⁺ doping significantly influences the negative thermal expansion performance of the material, as well as alters the temperature-dependent changes in NIR fluorescence intensity and lifetime. In addition, a NIR fluorescence lifetime temperature probe doped with Nd³⁺/Yb³⁺/Er³⁺ has been constructed. When the temperature increased from 303 K to 403 K, the fluorescence intensity of the probe at 1538 nm increased by a factor of 127.5. Furthermore, as the temperature rose from 323 K to 403 K, the fluorescence lifetime of the probe at 1538 nm extended from 41.93 μs to 204 μs. By utilizing the lifetime of Er³⁺ for temperature sensing, a relative sensitivity of 6.03%K⁻¹ was achieved at 323 K, indicating significant potential application value of this probe in the field of biological temperature measurement.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 7","pages":"Pages 8516-8523"},"PeriodicalIF":5.1,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143510898","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Thermal, optical, and gamma-ray shielding properties of CdO - PbO - Bi2O3 glasses","authors":"R.M. Ahmed ,&nbsp;R.L. Elwan ,&nbsp;A.M. Fayad","doi":"10.1016/j.ceramint.2024.12.308","DOIUrl":"10.1016/j.ceramint.2024.12.308","url":null,"abstract":"<div><div>Glass systems of a chemical composition of xCdO-(100−x)[50PbO - 50Bi₂O₃] (40 mol% ≤ x ≤ 80 mol%) were fabricated by melt-quenching method. The study examined how these glasses performed as shielding materials, based on their CdO content. The corresponding linear attenuation coefficient (LAC) values for the samples containing 40, 60, 70, and 80 mol.% of CdO are 678.953 cm⁻¹, 537.713 cm⁻¹, 441.381 cm⁻¹, and 372.764 cm⁻¹, respectively. The sample containing 40 mol.% of CdO exhibited the highest values of linear attenuation coefficient (LAC), mass attenuation coefficient (MAC), and effective atomic number (Z_eff). Therefore, this sample is predominated for radiation protection. The mean free path (MFP) are 0.001, 0.002, 0.002, 0.003 cm at 0.015 MeV and 2.635, 3.068, 3.509, and 3.793 cm at 15 MeV, for the samples containing 40, 60, 70, and 80 mol.% of CdO, respectively. The differential scanning calorimetry (DSC) showed an endothermic (down) peak at a range of temperatures from 450 °C to 485 °C, related to the glass transition (T_g). The average refractive index (n_average), determined by some theoretical models, exhibits values ranging from 2.63 eV to 3.08 eV when determined using the E_g(direct). The values of the energy gaps of the studied glasses decreased by increasing the content of CdO (mol.%) due to the gradual rise in the quantity of non-bridging oxygen as the CdO content (mol.%) increases. The enhancement in optical basicity (Λ) by increasing CdO content (mol.%) in the studied glasses is strongly associated with a reduction in the strength of the metal-oxide bond. The values of the zero-frequency dielectric constant of the lattice (<em>ε</em>_<em>L</em>) are 1.13, 1.19, 1.52, and 1.62 corresponding to the samples containing 40, 60, 70, and 80 mol.% of CdO, respectively.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 7","pages":"Pages 8774-8789"},"PeriodicalIF":5.1,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143510901","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Ge–As–S chalcogenide glasses with high laser-induced damage threshold at 1.55 μm for acousto-optic applications","authors":"Ao Cui ,&nbsp;Yingying Wang ,&nbsp;Miao Wu ,&nbsp;Shixun Dai ,&nbsp;Changgui Lin ,&nbsp;Zhongchao Wu ,&nbsp;Lingling Jiang","doi":"10.1016/j.ceramint.2024.12.311","DOIUrl":"10.1016/j.ceramint.2024.12.311","url":null,"abstract":"<div><div>In this study, two series of Ge–As–S glasses were prepared with compositions of xGeS₂–(100-x)As₂S₃ (x = 20, 38, 56, 74 mol%) and Ge_yAs₁₅S_85-y (y = 21, 25, 30, 35 mol%) to investigate their potential as acousto-optic (AO) materials. The thermal-optic coefficients, acousto-optic and laser-induced damage properties of the Ge–As–S glasses were studied. For the xGeS₂–(100-x)As₂S₃ system, increasing in GeS₂ content led to a decrease in AO figure of merit <em>M</em>_<em>2</em> and acoustic attenuation, while significantly improving thermal-optic coefficient <em>(dn/dT</em>) and laser-induced damage threshold (LIDT). Conversely, in the Ge_yAs₁₅S_85-y system, increasing Ge content enhanced the AO performance but led to a deterioration in both <em>dn/dT</em> and LIDT. Remarkably, the 74GeS₂–26As₂S₃ glass with outstanding LIDT of 19.31 J/cm² and favorable <em>dn/dT</em> of 20.0 × 10⁻⁶/°C, exceeds three typical commercial As₂S₃, Ge₃₃As₁₂Se₅₅, and As₂Se₃ glasses in terms of performance. The reliable AO properties, low thermal-optic coefficient, and excellent laser damage resistance make Ge–As–S glasses promising for high-power infrared AO devices.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 7","pages":"Pages 8816-8823"},"PeriodicalIF":5.1,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143510904","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Oxygen vacancies enriched Z-scheme BiOI/Bi2O3 heterojunction with controllable band-gap for dye degradation and Cr (VI) reduction","authors":"Fei Li ,&nbsp;Gang Liu ,&nbsp;Miaomiao Liu ,&nbsp;Xinmei Liu ,&nbsp;Limin Dong ,&nbsp;Dongbo Wang ,&nbsp;Yuewu Huang ,&nbsp;Jingzhou Zhang ,&nbsp;Zhitao Yang ,&nbsp;Wenlong Yang ,&nbsp;Mingyang Wu ,&nbsp;Liancheng Zhao","doi":"10.1016/j.ceramint.2024.12.295","DOIUrl":"10.1016/j.ceramint.2024.12.295","url":null,"abstract":"<div><div>This study successfully synthesized the wrinkled Z-scheme BiOI/Bi₂O₃ heterojunction with controllable band-gap energy by a co-precipitation method. The wrinkled structure regulated by CH₃COOH as a structural modifier would enhance the utilization of visible light, and the oxygen defects generate a large number of active sites within BiOI/Bi₂O₃ heterojunctions. With an increase in the concentration of HAc, the band-gap energy (E_g) of the BiOI/Bi₂O₃ could be modulated from 1.75 to 1.96 eV. To assess the photocatalytic efficiency, the synthesized BiOI/Bi₂O₃ was further employed for Cr(VI) reduction as well as degradation of Methyl Blue (MB) and Rhodamine B (RhB). The heterojunction of BiOI/Bi₂O₃-2, possessing an energy gap (E_g) of 1.86 eV, demonstrated the optimized photocatalytic efficiency of 97.2 %, 97.3 %, and 98.6 % for Cr(VI) reduction, MB and RhB degradation, respectively. In addition, the Z-scheme BiOI/Bi₂O₃ heterojunction has high reduction efficiency in the Cr (VI) of natural wastewater. Radical capture experiments and ESR spectroscopy emphasized the primary importance of species in the Cr(VI) reduction, while highlighting the primary role of e⁻, ·O₂⁻ and h⁺ species in the MB and RhB degradation. The work provided a straightforward and efficient strategy for modulating the energy gap (E_g) of the wrinkled BiOI/Bi₂O₃ heterojunction, while also exploring the intricate correlation between E_g and photocatalytic activity. The photocatalytic enhancement effect demonstrated by the BiOI/Bi₂O₃ could be applied in various domains of photocatalysis, thereby offering valuable insights for designing multifunctional and highly active photocatalysts.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 7","pages":"Pages 8647-8657"},"PeriodicalIF":5.1,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143511646","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Bifunctional nanocomposites based on TixSn1-xO2 obtained by the protein sol-gel method using the microwave-assisted hydrothermal process","authors":"Raissa da Cruz Serejo ,&nbsp;Aluísio Alves Cabral Junior ,&nbsp;Alejandro Eusébio Rojas Nuñez ,&nbsp;Antônio Ernandes Macedo Paiva ,&nbsp;Sérgio Luís Sales de Oliveira ,&nbsp;Cristina de Andrade Monteiro ,&nbsp;Davi Souza Ferreira ,&nbsp;Lucia Helena Mascaro Sales ,&nbsp;Gilvan Pereira de Figueredo ,&nbsp;José Hilton Gomes Rangel ,&nbsp;Rodolfo Luiz Bezerra de Araújo Medeiros ,&nbsp;Marcelo Moizinho Oliveira","doi":"10.1016/j.ceramint.2024.12.264","DOIUrl":"10.1016/j.ceramint.2024.12.264","url":null,"abstract":"<div><div>The microwave-assisted hydrothermal sol-gel method is a relatively new method of processing nanomaterials little used. This method stands out for its ability to produce highly pure homogeneous nanopowders in a short time at low temperatures. Studies involving this technique report more than one type of processing to obtain the desired material. However, in this work, the Ti_xSn_1-xO₂ composite was obtained in one step. Therefore, the aim of this work was to synthesize, for the first time, nanocomposites based on Ti_xSn_1-xO₂ (x = 0, 0.3, 0.5, 0.7 and 1) by the microwave-assisted hydrothermal protein sol-gel method in one step, using a protein precursor from a renewable source, rendering the method more environmentally friendly. The results obtained by XRD, Rietveld refinement, FTIR, TG/DSC, SEM-EDS, SEM-FEG, nitrogen physisorption analysis using the BET method and diffuse reflectance spectroscopy in the UV–Vis region indicated that Ti_xSn_1-xO₂ nanocomposites can be obtained in up to 60 min at a temperature of 170 °C. The samples had a tetragonal rutile and anatase phase, with agglomerates of particles between 36.9 and 83.0 nm in size, inhomogeneous and in the shape of nanospheres an nanorods, and a surface area of up to 188.186 m² g^-1. It was observed that the band gap energy decreased as the concentration of TiO₂ increased (3.67–3.04 eV). The photocatalytic activity of the nanocomposites was assessed by the photodegradation of the dye methylene blue (MB), showing a decolorization rate of up to 76 % in 160 min under UV-C irradiation. Antibacterial activity was checked by broth microdilution against standard strains of E. <em>coli</em> and S. <em>aureus</em> bacteria and all the samples showed antibacterial activity against the strains with a minimum inhibitory concentration (MIC) of up to 625 μg mL⁻¹. These results therefore highlight the efficiency of the proposed method for obtaining bifunctional nanocomposites.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 7","pages":"Pages 8339-8352"},"PeriodicalIF":5.1,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143511652","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Structural, dielectric and magnetodielectric behavior of Bi3.15Nd0.85Ti3-x(Fex/2Crx/2)O12 (0.0 ≤ x ≤ 0.4) ceramics","authors":"Sandhya Rani ,&nbsp;Arbaz Reyaz Khan ,&nbsp;Anand Sagar ,&nbsp;Sumit Bhardwaj ,&nbsp;Aayush Gupta ,&nbsp;Rahul Goel ,&nbsp;Harshit Tripathi ,&nbsp;Mir Waqas Alam ,&nbsp;Sanjeev Kumar","doi":"10.1016/j.ceramint.2024.12.286","DOIUrl":"10.1016/j.ceramint.2024.12.286","url":null,"abstract":"<div><div>This study explores the structural, dielectric, ferroelectric, and magnetodielectric (MD) properties of bismuth neodymium titanate ceramics co-doped with Fe and Cr ions (Bi_3.15Nd_0.85Ti_3-x(Cr_x/2Fe_x/2)O₁₂; x = 0.0, 0.1, 0.2, 0.3, 0.4). X-ray diffraction (XRD) confirmed phase purity and revealed lattice distortions induced by the Fe/Cr substitution. Dielectric analysis demonstrated a reduction in permittivity and loss with increasing dopant levels, attributed to the limited dipole displacement in the modified lattice. Ferroelectric studies showed diminishing remnant polarization (2Pr) with increased doping, linked to the reduction in grain size and enhanced grain boundary pinning. Magnetic hysteresis (M − H) curves indicated the emergence of weak ferromagnetism, with non-saturating S-type loops, originating from canted spin interactions among Fe³⁺ and Cr³⁺ ions. BiT-2CrF (x = 0.2) emerged as the standout composition, exhibiting the highest magnetoelectric coupling coefficient (γ = −17.90 (memu/g)⁻²) due to its optimized balance of lattice distortion and multiferroic interactions. These results position BiT-2CrF as a promising candidate for advanced multiferroic memory devices, leveraging its synergistic dielectric and magnetic properties.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 7","pages":"Pages 8558-8569"},"PeriodicalIF":5.1,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143511752","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Synthesis and characterization of geopolymers based on phosphate mining tailings and its application for carbon dioxide and nitrogen adsorption","authors":"Alisson Lopes Freire ,&nbsp;Aryandson da Silva ,&nbsp;Daniela Gier Della Rocca ,&nbsp;Júlia da Silveira Salla ,&nbsp;Sibele Berenice Castellã Pergher ,&nbsp;Enrique Rodríguez-Castellón ,&nbsp;Humberto Jorge José ,&nbsp;Regina de Fátima Peralta Muniz Moreira","doi":"10.1016/j.ceramint.2024.12.270","DOIUrl":"10.1016/j.ceramint.2024.12.270","url":null,"abstract":"<div><div>Phosphate sludge, a byproduct of phosphate mining, poses environmental challenges due to its large-scale generation and storage requirements, impacting land use and aesthetics. The need to investigate sustainable recycling practices for cleaner phosphate production has been emphasized, and in this work the reuse of mine tailings as raw materials to produce geopolymeric adsorbents was proposed. The synthesis and characterization of granular and spherical geopolymer particles produced by the incorporation of 19 % of phosphate mine tailings were deeply investigated to produce adsorbents suitable for CO₂/N₂ separation and capture process. The geopolymers were characterized by thermogravimetric analysis (TGA), X-ray diffraction (XRD), Nuclear magnetic resonance (NMR), BET surface area, Scanning electron microscopy (SEM) and compressive strength analysis. Equilibrium isotherms for carbon dioxide and nitrogen were determined within in a pressure range of 1–25 bar and at temperatures ranging from 35 to 250 °C. The adsorption cycles were evaluated at 21 °C with a pressure variation of up to 10 bar and an adsorption capacity of 3.15 mmol CO₂∙g⁻¹ was obtained. The SIPS model was found to fit the experimental data well. The granular geopolymer has a higher CO₂ adsorptive capacity than the geopolymer beads due to the higher BET surface area (298 m² g⁻¹ and 4.2 m² g⁻¹, respectively). At low temperatures (&lt;35^oC), CO₂ is physically adsorbed, while a different mechanism is involved in CO₂ removal at high temperatures. The presence of iron oxides in the geopolymeric matrix could result in a chemical interaction with CO₂ and the formation of iron bicarbonate, monodentate carbonate and bidentate carbonate, which could be favored by increasing temperature and pressure. The phosphate waste-based geopolymer developed in this study has an adsorption capacity ∼15 % higher than those reported in the literature using wastes. In addition, the production process is straightforward and cost-effective.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 7","pages":"Pages 8396-8407"},"PeriodicalIF":5.1,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143511856","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Strong red upconversion luminescence of Yb3+/Er3+ co-doped Bi2O3 phosphors for optical thermometry","authors":"Xiangyue Liu ,&nbsp;Bing Li ,&nbsp;Bin Duan ,&nbsp;Shiying Guo ,&nbsp;Shengli Zhang ,&nbsp;Nan Meng ,&nbsp;Zhaoyang Lou ,&nbsp;Tong Liu ,&nbsp;Junshan Hu ,&nbsp;Hong Ge","doi":"10.1016/j.ceramint.2024.12.329","DOIUrl":"10.1016/j.ceramint.2024.12.329","url":null,"abstract":"<div><div>Bi₂O₃ phosphors co-doped with Yb³⁺ and Er³⁺ ions were successfully synthesized using a high-temperature solid-state method. Under 980 nm near-infrared laser excitation, Bi₂O₃: Yb³⁺/Er³⁺ phosphors emit strong red light at 658 nm and weak green light at 551 nm. The optimal doping concentrations of Yb³⁺ and Er³⁺ are 0.10 and 0.02, respectively. This composition results in a red-to-green intensity ratio of 157.6. The red emission is primarily driven by energy transfer, promoting Er³⁺ from the ⁴I_13/2 level to the ⁴F_9/2 level [Yb³⁺ (²F_5/2) + Er³⁺ (⁴I_13/2) → Yb³⁺ (²F_7/2) + Er³⁺ (⁴F_9/2)]. The cross-relaxation process lowers the photon population in the ⁴F_7/2 level and raises the photon population in the ⁴F_9/2 level, leading to the occurrence of a single-band red emission. This phosphor also demonstrates promising potential for optical temperature sensing. It exhibits a maximum relative sensitivity of 3.02 % K⁻¹ at 298 K.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 7","pages":"Pages 8989-8996"},"PeriodicalIF":5.1,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143512231","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}