Processing and Application of Ceramics最新文献_第2页

Study of phase evolution and dielectric properties of Sr2Mn0.7Sn0.3O4 Sr2Mn0.7Sn0.3O4的相演化及介电性能研究

IF 1.1 4区材料科学

Processing and Application of Ceramics Pub Date : 2023-01-01 DOI: 10.2298/pac2302181n

G. Nirala, S. Upadhyay

{"title":"Study of phase evolution and dielectric properties of Sr2Mn0.7Sn0.3O4","authors":"G. Nirala, S. Upadhyay","doi":"10.2298/pac2302181n","DOIUrl":"https://doi.org/10.2298/pac2302181n","url":null,"abstract":"Ruddlesden-Popper oxide Sr2Mn0.7Sn0.3O4 was synthesized by solid state method by calcining at different temperatures between 1200 and 1500?C. The phase evolution during thermal treatments was investigated and it was shown that the powder calcined at 1500?C and ceramics sintered at 1500?C have single phase structure. Rietveld refinement of the XRD data confirmed tetragonal crystal structure having a = b = 3.9425 ? and c = 12.1230? lattice parameters and I4/mmm space group symmetry. Permittivity (?), impedance (Z*), dissipation factor (tan ?) and AC conductivity (?AC) of the samples were studied in the frequency range 1 kHz-2MHz and temperature range 60-600?C. An equivalent circuit comprising two parallel R-L elements and one constant phase element (CPE) model fitted the impedance data very well. Components of the equivalent circuit were correlated with compositional micro inhomogeneities in the sintered sample. Resonance-like feature observed in the dissipation factor at a particular temperature is attributed to the cancellation of capacitive and inductive reactants. Negative permittivity and loss of the sintered sample were compared with other ceramic oxides showing negative permittivity.","PeriodicalId":20596,"journal":{"name":"Processing and Application of Ceramics","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68583834","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}

引用次数: 0

Review on thermal conductivity of SiCf/SiC composites for nuclear applications 核用SiCf/SiC复合材料导热性能研究进展

4区材料科学

Processing and Application of Ceramics Pub Date : 2023-01-01 DOI: 10.2298/pac2303203g

Weina Guo, Yantao Gao

引用次数: 0

Structure and dielectric properties of Lu-doped SrBi2Ta2O9 synthesized by the molten salt method 熔盐法制备掺镧SrBi2Ta2O9的结构和介电性能

4区材料科学

Processing and Application of Ceramics Pub Date : 2023-01-01 DOI: 10.2298/pac2303256a

Mohamed Afqir, Didier Fasquelle, Amina Tachafine, Yingzhi Meng, Mohamed Elaatmani, Abdelouahad Zegzouti, Abdelhamid Oufakir, Mohamed Daoud

{"title":"Structure and dielectric properties of Lu-doped SrBi2Ta2O9 synthesized by the molten salt method","authors":"Mohamed Afqir, Didier Fasquelle, Amina Tachafine, Yingzhi Meng, Mohamed Elaatmani, Abdelouahad Zegzouti, Abdelhamid Oufakir, Mohamed Daoud","doi":"10.2298/pac2303256a","DOIUrl":"https://doi.org/10.2298/pac2303256a","url":null,"abstract":"Lu-doped SrBi2Ta2O9 (SrBi2-xLuxTa2O9 where x = 0, 0.025, 0.05, 0.75 and 0.1) powders were synthesized by combination of molten salt method and solid-state route. FTIR, Raman and XRD techniques were performed to follow the transformation of reactants into the desired products. Characterization of all samples shows pure and single-phase orthorhombic structured materials obtained with plate-like morphology that is composed of fine and coarse-grained particles. The prepared powders were pressed and sintered at different temperatures up to 1200?C. Microstructure of the sintered samples is also likely to be affected by doping. The first study of dielectric measurements describes the effect of the application of DC bias, at roomtemperature, on the undoped and Lu-doped ceramics and shows that there is little or no effect of DC bias. The sample SrBi1.95Lu0.05Ta2O9 had maximal dielectric constant (??) and minimal dielectric loss (tan?). In the second part of this work, the temperature dependence of ?? and tan_ was considered. It was concluded that Lu-doping not only reduces the Curie temperature, but also brings a diffused phase transition, showing a crossover between displacive and diffusive behaviour.","PeriodicalId":20596,"journal":{"name":"Processing and Application of Ceramics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135263534","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}

引用次数: 0

Processing and electrical conductivity property of lithium-doped high-entropy pyrochlore and perovskite ceramics 掺锂高熵焦绿石和钙钛矿陶瓷的制备及其导电性

4区材料科学

Processing and Application of Ceramics Pub Date : 2023-01-01 DOI: 10.2298/pac2303264k

Yazhou Kong, Shihang Hu, Chengcheng Cai, Zexiong Wang, Shuai Zhang

{"title":"Processing and electrical conductivity property of lithium-doped high-entropy pyrochlore and perovskite ceramics","authors":"Yazhou Kong, Shihang Hu, Chengcheng Cai, Zexiong Wang, Shuai Zhang","doi":"10.2298/pac2303264k","DOIUrl":"https://doi.org/10.2298/pac2303264k","url":null,"abstract":"Lithium-doped Li0.66La1.12(Ti0.2Zr0.2Hf0.2Sn0.2Nb0.2)2O7 (LLTNO), Li0.66La1.12(Ti0.2Zr0.2Hf0.2Sn0.2Ta0.2)2O7 (LLTTO) high-entropy pyrochlore and Li0.5Sr0.5(Ti0.2Zr0.2Hf0.2Sn0.2Ta0.2)O3 (LSTTO), Li0.5Ba0.5(Ti0.2Zr0.2Hf0.2Sn0.2Nb0.2)O3 (LBTNO) high-entropy perovskite ceramics were synthesized by solid state reaction method and sintered. Crystal structure, microstructure and electrical properties of these high entropy ceramics were studied. The LLTNO and LLTTO pellets sintered at 1300 ?C present a pyrochlore structure, while LSTTO and LBTNO pellets sintered at 1350 ?C present a perovskite structure. The LBTNO ceramics has a total conductivity of 1.25 ? 10?7 S?cm?1 at room temperature while the LSTTO sample exhibits the highest conductivity of 2.11 ? 10?7 S?cm?1 among all samples. Both LSTTO and LBTNO ceramics present negligible electronic conductivity. Relative densities of the LLTNO, LLTTO, LSTTO and LBTNO ceramics were 82, 88, 86 and 87%TD, respectively, which is the reason for low conductivity of these high entropy ceramics. The activation energies of the LSTTO and LBTNO samples were 0.39 and 0.38 eV, respectively, which is close to the traditional Li+-type conducting solid electrolytes.","PeriodicalId":20596,"journal":{"name":"Processing and Application of Ceramics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135263539","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}

引用次数: 0

Effect of stirring rate on the size of hydroxyapatite nanoparticles synthesized by a modified heat-treated precipitation method 搅拌速率对改性热处理沉淀法合成羟基磷灰石纳米颗粒粒径的影响

IF 1.1 4区材料科学

Processing and Application of Ceramics Pub Date : 2023-01-01 DOI: 10.2298/pac2302133h

Eduardo Hernández-Silva, F. Vázquez-Hernández, S. Mendoza-Acevedo, M. Pérez-González, S. Tomás-Velázquez, P. Rodríguez-Fragoso, J. Mendoza-Álvarez, Pedro Luna-Arias

{"title":"Effect of stirring rate on the size of hydroxyapatite nanoparticles synthesized by a modified heat-treated precipitation method","authors":"Eduardo Hernández-Silva, F. Vázquez-Hernández, S. Mendoza-Acevedo, M. Pérez-González, S. Tomás-Velázquez, P. Rodríguez-Fragoso, J. Mendoza-Álvarez, Pedro Luna-Arias","doi":"10.2298/pac2302133h","DOIUrl":"https://doi.org/10.2298/pac2302133h","url":null,"abstract":"Chemical synthesis is one of the most employed methods to obtain crystalline hydroxyapatite nanoparticles. It is feasible to vary the synthesis conditions and study their effects on nanoparticle structure. In this work, hydroxyapatite nanoparticles were synthesised by a modified heat-treated precipitation method and varying stirring rate of the solution during the nucleation process. The main goal was to reduce the particle size without affecting the crystallinity degree of the synthesized material what is important for several use cases, such as biomedical applications. The produced materials were characterized by X-ray diffraction, Fourier transformed infrared spectroscopy, ?-Raman spectroscopy, X-ray photoelectron spectroscopy, high-resolution transmission electron microscopy and scanning electron microscopy. The nanoparticle?s size decreased by increasing the stirring rate during the nucleation step, showing that the employed synthesis method is efficient for obtaining hydroxyapatite nanoparticles of variable sizes without affecting the crystallinity degree.","PeriodicalId":20596,"journal":{"name":"Processing and Application of Ceramics","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68583066","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}

引用次数: 0

Multi peak emission and morphological evolution of Fe-doped ZnOs nanoflowers 掺铁氧化锌纳米花的多峰发射与形态演化

IF 1.1 4区材料科学

Processing and Application of Ceramics Pub Date : 2023-01-01 DOI: 10.2298/pac2302149n

Hind Neelamkodan, U. Megha, Puzhakkara Manathanath Binitha

引用次数: 0

Enhanced green luminescence properties of cu doped ZnO nano-flowers and their improved antibacterial activities cu掺杂ZnO纳米花的绿色发光性能增强及抗菌活性提高

IF 1.1 4区材料科学

Processing and Application of Ceramics Pub Date : 2023-01-01 DOI: 10.2298/pac2301081n

Hind Neelamkodan, U. Megha, Manathanath Binitha

{"title":"Enhanced green luminescence properties of cu doped ZnO nano-flowers and their improved antibacterial activities","authors":"Hind Neelamkodan, U. Megha, Manathanath Binitha","doi":"10.2298/pac2301081n","DOIUrl":"https://doi.org/10.2298/pac2301081n","url":null,"abstract":"The copper doped ZnO (CuxZn1-xO, where x = 0, 0.01, 0.02, 0.04, 0.05) nanoflowers were produced by using co-precipitation process. Hexagonal wurtzite nanocrystalline phase of both pure and Cu-doped samples was confirmed by X-ray diffraction analysis. Field emission scanning electron microscopy results confirmed the emergence of fully dispersed nanoflower like morphologies in the Cu-doped ZnO and uniform dispersion of particles. Band gap energies of the prepared samples were calculated using the Tauc?s plot. All of the generated samples? room temperature photoluminescent spectra show two emission peaks, one excitonic peak in the UV region and another broad defect level peak in the visible area. The yellow and green luminescence characteristics of both pure and doped samples were analysed via the PL spectra in visible light region, making them appropriate for optoelectronic applications. The antibacterial potential of the produced nanostructures against the bacterial strains of Enterococcus Faecalis (gram positive) and Pseudomonas Aeruginosa (gram negative) were assessed. When compared to the pure ZnO nanostructures, the doped samples exhibit enhanced antibacterial activity. For the samples with 5 at.%Cu, the greatest zone of inhibition against Pseudomonas Aeruginosa was noted to be 25mm. For the samples doped with 5 at.% Cu, the largest zone of inhibition against Enterococcus Faecalis was 21mm. The findings indicate that the obtained samples have higher antibacterial potential against gram negative than gram positive bacteria. The prepared doped ZnO nanoflowers were therefore recommended as excellent green nanophosphors for the production of white LEDs and effective nanoantibiotics against gram-negative bacteria.","PeriodicalId":20596,"journal":{"name":"Processing and Application of Ceramics","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68582864","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}

引用次数: 1

Physicochemical properties of the Crofer 22 APU steel with La0.6Sr0.4Co0.2Fe0.8O3-δ protective-conductive coatings prepared by pulsed laser deposition 脉冲激光沉积制备La0.6Sr0.4Co0.2Fe0.8O3-δ保护导电涂层Crofer 22 APU钢的物理化学性能

4区材料科学

Processing and Application of Ceramics Pub Date : 2023-01-01 DOI: 10.2298/pac2303301d

Ewa Durda, Andrzej Kruk

{"title":"Physicochemical properties of the Crofer 22 APU steel with La0.6Sr0.4Co0.2Fe0.8O3-δ protective-conductive coatings prepared by pulsed laser deposition","authors":"Ewa Durda, Andrzej Kruk","doi":"10.2298/pac2303301d","DOIUrl":"https://doi.org/10.2298/pac2303301d","url":null,"abstract":"Commercial La0.6Sr0.4Co0.2Fe0.8O3-? powder was used for preparation of corresponding perovskite films on commercial Crofer 22 APU high chromium steel by pulsed laser deposition. The obtained films PLD1 and PLD2 with a thickness of 1.1 and 0.35 ?m, respectively, were dense and homogeneous, with good adhesion to the polished surface. Oxidation studies of the samples were carried out in air at 800?C for 200h. The calculated parabolic rate constant kp after isothermal oxidation for the PLD1 sample was 4.10 ? 10?14 g2cm?4s?1 and was approximately four times lower than the oxidation rate determined for the PLD2 sample. As a result of the oxidation process, in both cases, a thin oxide layer of chromia and Mn1.5Cr1.5O4 spinel was formed on the steel/film interface. In addition, small amounts of manganese-chromium spinel crystals were observed on the films? surfaces. Values of the specific electrical resistance at 800 ?C after 100 h of the experiment were 0.06 and 0.038W?cm2 for PLD1 and PLD2, respectively. The results indicate that the applied coatings meet the criteria set upon protective-conductive layers for interconnect materials, for the IT-SOFCs (intermediate-temperature solid oxide fuel cells) applications.","PeriodicalId":20596,"journal":{"name":"Processing and Application of Ceramics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135270025","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}

引用次数: 0

Lead-free piezoelectric ceramics - an electroactive material that provides electrical stimulation cues for bone regeneration 无铅压电陶瓷——一种电活性材料，为骨骼再生提供电刺激线索

4区材料科学

Processing and Application of Ceramics Pub Date : 2023-01-01 DOI: 10.2298/pac2303214j

Zhengyang Jin, Bingheng Lu, Yan Xu, Xujing Zhang

{"title":"Lead-free piezoelectric ceramics - an electroactive material that provides electrical stimulation cues for bone regeneration","authors":"Zhengyang Jin, Bingheng Lu, Yan Xu, Xujing Zhang","doi":"10.2298/pac2303214j","DOIUrl":"https://doi.org/10.2298/pac2303214j","url":null,"abstract":"Experimental evidence shows that natural bone is piezoelectric, and bioelectric phenomena in natural bone play an essential role in bone development and bone defect repair. Piezoelectric ceramics can deform with physiological movements and consequently deliver electrical stimulation to cells or damaged tissue without the need for an external power source. They exhibit piezoelectricity and good biological properties similar to those of natural bone and have shown great potential in bone tissue engineering. This study aims to present an overview of the relationship between electrical stimulation and bone repair as well as the principle of the piezoelectric effect, emphasizing the material characteristics, research progress and application of piezoelectric ceramics in bone tissue regeneration. The limitations of piezoelectric ceramics in promoting osteogenesis by electrical stimulation were also analysed. Overall, this review comprehensively emphasized the essential characteristics of piezoelectric ceramics and pointed out the new direction for the future development of piezoelectric ceramics.","PeriodicalId":20596,"journal":{"name":"Processing and Application of Ceramics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135310700","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}

引用次数: 0

Fluorine substituted hydroxyapatite microspheres: Template-free hydrothermal synthesis and sustained fluoride-releasing properties 氟取代羟基磷灰石微球:无模板水热合成和持续氟化物释放特性

4区材料科学

Processing and Application of Ceramics Pub Date : 2023-01-01 DOI: 10.2298/pac2303248z

Qing-Xia Zhu, Liu Li, Wan-Ting Xu, Quan-Yi Nie, Yun-Long Xu, Jia-Xin Liu

{"title":"Fluorine substituted hydroxyapatite microspheres: Template-free hydrothermal synthesis and sustained fluoride-releasing properties","authors":"Qing-Xia Zhu, Liu Li, Wan-Ting Xu, Quan-Yi Nie, Yun-Long Xu, Jia-Xin Liu","doi":"10.2298/pac2303248z","DOIUrl":"https://doi.org/10.2298/pac2303248z","url":null,"abstract":"To avoid sudden release of fluoride, F-substituted hydroxyapatite (FHA) porous microspheres were prepared for the treatment of F-deficiency tissues. In the absence of any template-directing reagents, FHA microspheres with diameters of about 30 ?m were successfully fabricated via hydrothermal method with urea as homogeneous precipitant to regulate the nucleation, growth and self-assembly process. Urea concentration and hydrothermal temperature played an important role in the formation and regulation of spherical hydroxyapatite. The synthesized FHA microspheres with large specific surface area, large pore volume and complex porous structure were efficient for the adsorption and long-term stable release of ionic extracts. Concentration of F- ions in physiological salt solution was maintained in the range of the therapeutic window without exceeding the toxic threshold within 30 days. The ionic extracts of FHA porous microspheres promoted the proliferation of human osteoblast-like cells (MG-63). The fabricated FHA microspheres may be a potential candidate as bioactive fluoride-release carriers for the treatment of osteoporosis and bone defects.","PeriodicalId":20596,"journal":{"name":"Processing and Application of Ceramics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135310722","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}

引用次数: 0