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Effect of Sr2+doping on the microwave dielectric properties of BaZrO3 ceramics Sr2+掺杂对BaZrO3陶瓷微波介电性能的影响
IF 2.2 4区 材料科学
Advances in Applied Ceramics Pub Date : 2023-08-28 DOI: 10.1080/17436753.2023.2247682
Dewei Cui, Hui Shao
{"title":"Effect of Sr2+doping on the microwave dielectric properties of BaZrO3 ceramics","authors":"Dewei Cui, Hui Shao","doi":"10.1080/17436753.2023.2247682","DOIUrl":"https://doi.org/10.1080/17436753.2023.2247682","url":null,"abstract":"ABSTRACT In this study, undoped and Sr2+ doped BaZrO3 ceramics were prepared by solid-state reaction using 3 wt-% B2O3 as sintering aid. The phase composition and microstructure of BaZrO3 were studied by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results show that introducing an appropriate amount of Sr2+ makes BaZrO3 ceramics Q × f value and density increase. In addition, the dielectric constant of BaZrO3 ceramics increases with the increase of Sr2+ addition. With excellent microwave dielectric properties, ϵ r = 34.17 and Q × f value of 39,070 GHz(@ 7.8 GHz) τf =  + 140 ppm/°C were obtained in 6 at.-% Sr2+ doped BaZrO3 with 3 wt-% B2O3 sintering aid at 1275°C for 5 h. Using this material as the medium, the simulation of GPS antenna by HFSS software shows that this material has the potential to be used as the antenna medium material.","PeriodicalId":7224,"journal":{"name":"Advances in Applied Ceramics","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2023-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78915624","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
An overview of oxidation in hybrid and glass-based protective coatings for thermoelectric materials for medium-temperature range applications 中温应用中热电材料的杂化和玻璃基保护涂层氧化的概述
IF 2.2 4区 材料科学
Advances in Applied Ceramics Pub Date : 2023-08-23 DOI: 10.1080/17436753.2023.2246000
F. D’Isanto, F. Smeacetto, M. Reece, M. Salvo
{"title":"An overview of oxidation in hybrid and glass-based protective coatings for thermoelectric materials for medium-temperature range applications","authors":"F. D’Isanto, F. Smeacetto, M. Reece, M. Salvo","doi":"10.1080/17436753.2023.2246000","DOIUrl":"https://doi.org/10.1080/17436753.2023.2246000","url":null,"abstract":"ABSTRACT Several oxidation protective coatings, both glass-based and ceramic/polymer hybrid coatings, for p- and n-type thermoelectrics were designed at the Politecnico di Torino in recent years, and they were characterised and tested under relevant conditions. The ‘glass-ceramic route’ to obtain a thermo-mechanical compatible and high-temperature resistant coated thermoelectric is discussed with some examples. Oxidation tests demonstrated the effectiveness of the coatings for the protection of both n- and p-type thermoelectrics.","PeriodicalId":7224,"journal":{"name":"Advances in Applied Ceramics","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2023-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72484391","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
From stoichiometric to non-stoichiometric high-entropy carbide: a case study of hafnium addition 从化学计量到非化学计量的高熵碳化物:铪加成的案例研究
IF 2.2 4区 材料科学
Advances in Applied Ceramics Pub Date : 2023-08-17 DOI: 10.1080/17436753.2023.2243120
Yuan Qin, Xiaofeng Wei, Ji‐Xuan Liu, Yongcheng Liang, Guo‐Jun Zhang
{"title":"From stoichiometric to non-stoichiometric high-entropy carbide: a case study of hafnium addition","authors":"Yuan Qin, Xiaofeng Wei, Ji‐Xuan Liu, Yongcheng Liang, Guo‐Jun Zhang","doi":"10.1080/17436753.2023.2243120","DOIUrl":"https://doi.org/10.1080/17436753.2023.2243120","url":null,"abstract":"ABSTRACT High-entropy carbide (Ti0.2x Zr0.2x Hf0.2x   + (1-x)Nb0.2x Ta0.2x )C x (HEC-(1-x)Hf, x = 0.6-1) ceramics with 0-40 at.% nominal carbon vacancy were prepared by adding metal Hf into (Ti0.2Zr0.2Hf0.2Nb0.2Ta0.2)C (HEC) as a case study. The samples prepared by spark plasma sintering at 2000oC exhibit relative densities higher than 99%, single-phase rock salt structure, and homogeneous metal elements distribution. Their lattice parameters increase gradually with the added Hf content. The lattice parameter of HEC-0.4Hf is 0.86% higher than HEC's. The average grain size of the samples decreased initially, followed by an increase as Hf content increased, which is controlled by the comprehensive effect of Hf addition and carbon vacancy. The thermal conductivities of the samples decrease with the increase of Hf addition. HEC-0.4Hf has a very low thermal conductivity of 5.6 W/m·K at room temperature, which decreases 67.8% compared to HEC. The increased phonon scattering by the carbon vacancies can be the main reason for the reduced thermal conductivity.","PeriodicalId":7224,"journal":{"name":"Advances in Applied Ceramics","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2023-08-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78248154","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
Impact of Er substitution on the properties of NdFeO3: structural, magnetic and microwave absorption 铒取代对NdFeO3性能的影响:结构、磁性和微波吸收
IF 2.2 4区 材料科学
Advances in Applied Ceramics Pub Date : 2023-08-14 DOI: 10.1080/17436753.2023.2243427
Qihua Liang, Haotong Zhang, Zhaofei Tong, Jinxiang Guo, Man Wang, Q. Yao, Huai-ying Zhou
{"title":"Impact of Er substitution on the properties of NdFeO3: structural, magnetic and microwave absorption","authors":"Qihua Liang, Haotong Zhang, Zhaofei Tong, Jinxiang Guo, Man Wang, Q. Yao, Huai-ying Zhou","doi":"10.1080/17436753.2023.2243427","DOIUrl":"https://doi.org/10.1080/17436753.2023.2243427","url":null,"abstract":"ABSTRACT As a rare earth ortho-ferrite, NdFeO3 has strong magnetocrystalline anisotropy and can be used for microwave absorption, but its own wave absorption performance is poor. In this paper, Er3+ replaces Nd3+ to improve its microwave performance. Nd1−xErxFeO3 (0 ≤ x ≤ 0.15) was prepared by the sol -gel method. The hysteresis loops at 10 and 300 K are show that the saturation magnetisation increased with the doping content, its due to change of the magnetic moment direction and the magnetocrystalline anisotropy for the entry of Er. Meanwhile, this paper studied the ZFC-FC curve of 10 -300 K under 200 Oe and found that with the increase of doping content, the magnetic transition temperature gradually decreases. The entry of Er improves the dielectric properties of NdFeO3, there are a large number of oxygen vacancies and interface polarisation, which improves its absorption performance. When x = 0.15, the reflection loss reaches −39.21 dB and the bandwidth reaches 1.76 GHz, which can be applied to the Ku band microwave absorption field.","PeriodicalId":7224,"journal":{"name":"Advances in Applied Ceramics","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2023-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74055166","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
Highly wear resistant dual-phase (Ti-Zr-Nb-Hf-Ta)C/(Ti-Zr-Nb-Hf-Ta) B2 high-entropy ceramics 高耐磨双相(Ti-Zr-Nb-Hf-Ta)C/(Ti-Zr-Nb-Hf-Ta) B2高熵陶瓷
IF 2.2 4区 材料科学
Advances in Applied Ceramics Pub Date : 2023-05-19 DOI: 10.1080/17436753.2023.2238160
A. Naughton-Duszová, D. Medveď, Lenka Ďaková, A. Kovalčíková, P. Švec, P. Tatarko, Hakan Ünsal, P. Hvizdoš, P. Šajgalík, J. Dusza
{"title":"Highly wear resistant dual-phase (Ti-Zr-Nb-Hf-Ta)C/(Ti-Zr-Nb-Hf-Ta) B2 high-entropy ceramics","authors":"A. Naughton-Duszová, D. Medveď, Lenka Ďaková, A. Kovalčíková, P. Švec, P. Tatarko, Hakan Ünsal, P. Hvizdoš, P. Šajgalík, J. Dusza","doi":"10.1080/17436753.2023.2238160","DOIUrl":"https://doi.org/10.1080/17436753.2023.2238160","url":null,"abstract":"ABSTRACT Wear characteristics of a fine-grained dual-phase high-entropy (Ti0.14Zr0.2Nb0.2Hf0.2Ta0.26)C + (Ti0.38Zr0.18Nb0.22Hf0.115Ta0.105)B2 were investigated using the ball-on-flat technique/dry sliding in air. The experimental material showed very high density with a value of 8.72 g/cm3 and a small grain size of HEC and HEB grains with values of 0.95 ± 0.30 and 0.99 ± 0.27 μm, respectively. The nano-hardness of the HEC and HEB grains is very high with mean values of 37.4 ± 2.3 and 43.0 ± 2.9 GPa, respectively with the micro-hardness of the dual system HV1 29.4 ± 2.0 GPa. The friction coefficient values during the test with 5 and 10 N increased from a value of 0.4 and reached the values 0.65 and 0.77 at the sliding distances of approximately 1500 and 1000 m, respectively. The specific wear rate decreased with increasing sliding distance at 5 N load, from 4.75 × 10−7 mm3/Nm to 4.2 × 10−7 mm3/Nm and at 10 N from 2.1 × 10−7 to 1.7 × 10−7 mm3/Nm. The dominant wear mechanisms in both cases were an oxidation-driven tribo-chemical reaction and tribo-layer formation in boride grains and mechanical wear in carbide grains.","PeriodicalId":7224,"journal":{"name":"Advances in Applied Ceramics","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2023-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84860557","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
Localised surface modification of high-strength aluminium–alumina metal matrix composite coatings using cold spraying and friction stir processing 采用冷喷涂和搅拌摩擦工艺对高强度铝-氧化铝金属基复合涂层进行局部表面改性
IF 2.2 4区 材料科学
Advances in Applied Ceramics Pub Date : 2023-05-19 DOI: 10.1080/17436753.2023.2227446
W. Jibran, P. Wanjara, Javad Gholipour Baradari, Maria Ophelia Jarligo, A. McDonald
{"title":"Localised surface modification of high-strength aluminium–alumina metal matrix composite coatings using cold spraying and friction stir processing","authors":"W. Jibran, P. Wanjara, Javad Gholipour Baradari, Maria Ophelia Jarligo, A. McDonald","doi":"10.1080/17436753.2023.2227446","DOIUrl":"https://doi.org/10.1080/17436753.2023.2227446","url":null,"abstract":"ABSTRACT This study presents a novel approach for surface repairs of high-strength, cold-worked aluminium (Al) alloys, without negatively affecting the base material strength. Low-pressure cold spraying was used to fabricate Al–Al2O3 metal matrix composite overlays, with varying concentrations of Al2O3 deposited on an Al alloy. Friction stir processing (FSP) was employed to disperse and consolidate the overlay coating on the base material. The FSP was found to improve the Al2O3 particle distribution in the coating and reduce the mean free path between Al2O3 particles. The coating hardness increased after FSP. The post-FSPed overlays also exhibited lower wear rates compared to the as-sprayed condition. Remarkable improvement was observed in the tensile properties of the coatings, which were attributed to the improved dispersion of Al2O3 particles in the matrix, while the enhanced ductility was attributed to the possible grain refinement that occurred due to the recrystallisation of Al during FSP.","PeriodicalId":7224,"journal":{"name":"Advances in Applied Ceramics","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2023-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81207703","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
Enamel (glassy) coatings for steel protection against high temperature corrosion 钢耐高温腐蚀用搪瓷(玻璃状)涂层
IF 2.2 4区 材料科学
Advances in Applied Ceramics Pub Date : 2023-05-19 DOI: 10.1080/17436753.2023.2231699
E. Medvedovski, Gerardo Leal Mendoza
{"title":"Enamel (glassy) coatings for steel protection against high temperature corrosion","authors":"E. Medvedovski, Gerardo Leal Mendoza","doi":"10.1080/17436753.2023.2231699","DOIUrl":"https://doi.org/10.1080/17436753.2023.2231699","url":null,"abstract":"ABSTRACT Vitreous ceramic-like enamel coatings can be applied onto low-alloy and carbon steel components of various configurations, including tubulars, by different cost-effective technological methods achieving thicknesses up to 300 µm. Corrosion resistance of the enamel coatings in acidic environments, boiling brines and high temperature – high pressure (HT-HP) steam with a presence of CO2-H2S containing gases simulating some processes in refinery, oil & gas and geothermal production was tested and evaluated. Specifically, the testing in simulating HT-HP downhole production conditions was conducted for the enamel coatings for the first time. Microstructural examination and analysis of the obtained enamel glassy coatings revealed their insignificant compositional and structural degradation. A high level of steel protection by enamelling in considered environments demonstrated these coatings’ potential for different corrosion-related industrial processes.","PeriodicalId":7224,"journal":{"name":"Advances in Applied Ceramics","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2023-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88323007","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
Kinetics investigation of alumina ceramics corrosion in nitric acid 氧化铝陶瓷在硝酸中的腐蚀动力学研究
IF 2.2 4区 材料科学
Advances in Applied Ceramics Pub Date : 2023-05-19 DOI: 10.1080/17436753.2023.2230675
L. Ćurković, Ivana Ropuš, Ivan Gabelica, Sanda Rončević
{"title":"Kinetics investigation of alumina ceramics corrosion in nitric acid","authors":"L. Ćurković, Ivana Ropuš, Ivan Gabelica, Sanda Rončević","doi":"10.1080/17436753.2023.2230675","DOIUrl":"https://doi.org/10.1080/17436753.2023.2230675","url":null,"abstract":"ABSTRACT The most widely used ceramic material is aluminium oxide, known as alumina. Due to its superior properties such as chemical stability, high wear resistance, refractoriness and so on, it is ideal for applications in aggressive environment. This type of environment often includes exposure to corrosive solids, liquids and gases. When ceramics come in contact with corrosive medium, several corrosion mechanisms can occur, depending on a number of parameters. Therefore, the corrosion behaviour of cold isostatically pressed (CIP) high purity alumina ceramics was observed under different conditions: 0.5, 1.25 and 2 mol dm−3 of nitric acid at 25°C, 40°C and 55°C through 10 days. Purity of used alumina ceramics was 99.8345 wt. % with 0.1655 wt. % of both sintering aid (MgO) and impurities (SiO2, CaO, Na2O and Fe2O3). The results show that Al2O3 ceramics exhibit good corrosion resistance in nitric acid. Al2O3 corrosion behaviour varies depending on the temperature, time and HNO3 concentration. In view of the reaction kinetics, it proceeds in the near-parabolic law in HNO3 aqueous solution and decreases with an increase of the HNO3 concentration.","PeriodicalId":7224,"journal":{"name":"Advances in Applied Ceramics","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2023-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84033877","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
Rapid evaluation of the particle-erosion resistance of Al2O3 ceramics, composites, and coatings using a resonant acoustic mixer 使用共振混频器快速评估Al2O3陶瓷、复合材料和涂层的抗颗粒侵蚀性能
IF 2.2 4区 材料科学
Advances in Applied Ceramics Pub Date : 2023-05-19 DOI: 10.1080/17436753.2023.2231230
P. Mechnich, G. Alkan
{"title":"Rapid evaluation of the particle-erosion resistance of Al2O3 ceramics, composites, and coatings using a resonant acoustic mixer","authors":"P. Mechnich, G. Alkan","doi":"10.1080/17436753.2023.2231230","DOIUrl":"https://doi.org/10.1080/17436753.2023.2231230","url":null,"abstract":"ABSTRACT The solid particle technology usage in concentrated solar power plants as direct heat absorption and storage medium necessitate well selection of the materials for the components such as transport and sluice systems, which are in direct contact with moving and falling hot particles up to 1500 ˚C. Beyond mechanical properties, chemical inertness and high-temperature stability, abrasion/erosion resistance are one of the key properties, for which, there is no easy-applicable and rapid test method exist enabling controlled lab-scale parametric studies. A novel particle impact test was established using a resonance acoustic mixer, in which ceramic particles are strongly accelerated and collide with the ceramic surface within a closed vessel. After determination of the most representative parameters such as ceramic ball size, vessel diameter, and retainment/removal of debris, selected experiments were conducted on three candidate materials aimed to be used as high-temperature transport/port systems; dense C 799 Al2O3, porous water-plasma sprayed Plascera-type Al2O3 and WHIPOX-type Al2O3/Al2O3 ceramic matrix composites with porous matrix; with and without porous protective Al2O3 coating. The distinct mass loss behaviour of candidate materials highlighted the viability of the test method and the relevance of microstructures of porous Al2O3 materials on abrasion resistance.","PeriodicalId":7224,"journal":{"name":"Advances in Applied Ceramics","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2023-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80485008","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
A comprehensive review of modern engineered ceramics coatings for optimised resistance to wear and corrosion 全面回顾现代工程陶瓷涂层优化抗磨损和耐腐蚀性能
IF 2.2 4区 材料科学
Advances in Applied Ceramics Pub Date : 2023-05-19 DOI: 10.1080/17436753.2023.2235497
D. Wolfe, C. Ryan, Christopher M. DeSalle, S. Stepanoff, Benjamin I. Aronson, Zachary M. Boring, Justin A. Reiss, Patrick E. Albert, Jackson K. Nicastro, Aaron P. Fjeldsted
{"title":"A comprehensive review of modern engineered ceramics coatings for optimised resistance to wear and corrosion","authors":"D. Wolfe, C. Ryan, Christopher M. DeSalle, S. Stepanoff, Benjamin I. Aronson, Zachary M. Boring, Justin A. Reiss, Patrick E. Albert, Jackson K. Nicastro, Aaron P. Fjeldsted","doi":"10.1080/17436753.2023.2235497","DOIUrl":"https://doi.org/10.1080/17436753.2023.2235497","url":null,"abstract":"ABSTRACT The value and impact that ceramic coatings have had in the development of modern mechanical systems and protection of components exposed to harsh environments are often overlooked and understated. Modern equipment must be capable of withstanding substantial attrition, impact damage, erosion and corrosion that degrades materials across a variety of applications. Ceramic coatings enable a robust protective barrier for underlying substrates that outperforms most alternative film barrier materials (i.e. polymers, metals, glasses). In this work, a comprehensive review of modern ceramic coatings for barrier protection against mechanical wear and chemical attack is discussed in detail over a large breadth of relevant topics and case studies. This review highlights many critical aspects including various coating functionalities, design architectures, processing effects, material classes and promising future directions for engineering high-performance ceramic coating.","PeriodicalId":7224,"journal":{"name":"Advances in Applied Ceramics","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2023-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86864251","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
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