Journal of Advanced Ceramics最新文献

{"title":"Preparation and toughening mechanism of Al ₂O ₃ composite ceramic toughened by B ₄C@TiB ₂ core–shell units","authors":"Yingjie Shi, Weixing Li, Xiaorong Zhang, Jiachao Jin, Jilin Wang, Yu Dong, Jingbo Mu, Guangsuo Wang, Xiaoliang Zhang, Zhixiao Zhang","doi":"10.26599/jac.2023.9220826","DOIUrl":"https://doi.org/10.26599/jac.2023.9220826","url":null,"abstract":"In this paper, the concept of incorporating core–shell structured units as secondary phases to toughen Al₂O₃ ceramics is proposed. An Al₂O₃ composite ceramic toughened by B₄C@TiB₂ core–shell units is successfully synthesized using a combination of molten salt methodology and spark plasma sintering. The synthesis of B₄C@TiB₂ core–shell toughening units stems from the prior production of core–shell structural B₄C@TiB₂ powders, and this core–shell structure is effectively preserved within the Al₂O₃ matrix after sintering. The B₄C@TiB₂ core–shell toughening unit consists of a micron-sized B₄C core enclosed by a shell approximately 500 nm thick, composed of numerous nanosized TiB₂ grains. The regions surrounding these core–shell units exhibit distinct geometric structures and encompass multidimensional variations in phase composition, grain dimensions, and thermal expansion coefficients. Consequently, intricate stress distributions emerge, fostering the propagation of cracks in multiple dimensions. This behavior consumes a considerable amount of crack propagation energy, thereby enhancing the fracture toughness of the Al₂O₃ matrix. The resulting Al₂O₃ composite ceramics displays a relative density of 99.7±0.2%, a Vickers hardness of 21.5±0.8 GPa, and a fracture toughness 6.92±0.22 MPa·m^1/2.","PeriodicalId":14862,"journal":{"name":"Journal of Advanced Ceramics","volume":"20 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135510198","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Resilient Si ₃N ₄@SiO ₂ nanowire aerogel for high-temperature electromagnetic wave transparency and thermal insulation","authors":"Wei Zhang, Lei Su, De Lu, Kang Peng, Min Niu, Lei Zhuang, Jian Feng, Hongjie Wang","doi":"10.26599/jac.2023.9220813","DOIUrl":"https://doi.org/10.26599/jac.2023.9220813","url":null,"abstract":" With the development of aerospace technology, the Mach number of aircraft continues to increase, which puts forward higher performance requirements for high-temperature wave-transparent materials. Silicon nitride has excellent mechanical properties, high-temperature stability, and oxidation resistance, but its brittleness and high dielectric constant impede its practical applications. Herein, by employing a template-assisted precursor pyrolysis method, we prepared a class of Si₃N₄@SiO₂ nanowires aerogels (Si₃N₄@SiO₂ NWAGs) that are assembled by Si₃N₄@SiO₂ nanowires with diameters ranging from 386 nm to 631 nm. The Si₃N₄@SiO₂ NWAGs have low densities (12-31 mg·cm^-3), a specific surface aerogel of 4.13 m²g^-1, and an average pore size of 68.9 μm. Mechanical properties characterization shows that the aerogels exhibit reversible compressibility from 60% compressive strain and good fatigue resistance even when being compressed for 100 times at a set strain of 20%. The aerogels also show good thermal insulation performance (0.032 W·m^-1K^-1 at room temperature), ablation resistance (butane blow torch), and high-temperature stability (maximum service temperature in the air over 1200 °C). The dielectric constant and loss of the aerogels are 1.02-1.06 and 4.3× 10^-5-1.4×10^-3 at room temperature, respectively. The combination of the good mechanical, thermal, and dielectric properties makes Si₃N₄@SiO₂ NWAG a promising ultralight wave-transparent and thermally insulating material for application at high temperatures.","PeriodicalId":14862,"journal":{"name":"Journal of Advanced Ceramics","volume":"218 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135568725","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"In-situ observation and mechanism of calcium–magnesium–alumina–silicates (CMAS) melts-induced degradation of RE ₂SiO ₅ (RE = Tb, Dy, Ho, Y, Er, Tm, and Yb) ceramics at 1500 °C","authors":"Zhilin Tian, Keyu Ming, Liya Zheng, Zhilin Chen, Fan Zhou, Peng Liu, Zihao Qiu, Donghui Wei, Bin Li, Jingyang Wang","doi":"10.26599/jac.2023.9220822","DOIUrl":"https://doi.org/10.26599/jac.2023.9220822","url":null,"abstract":"Rare earth (RE) silicate is one of the most promising environmental barrier coatings for silicon-based ceramics in gas turbine engines. However, CMAS corrosion becomes much more serious and is the critical challenge for RE silicate with the increasing operating temperature. Therefore, it is quite urgent to clarify the mechanism of high-temperature CMAS-induced degradation of RE silicate at relatively high temperatures. Herein, the interaction between RE₂SiO₅ and CMAS up to 1500^oC was investigated by a novel high-temperature in-situ observation method. High temperature promotes the growth of the main reaction product (Ca₂RE₈(SiO₄)₆O₂) fast along [0 0 1] direction, and the precipitation of short and horizontally distributed Ca₂RE₈(SiO₄)₆O₂ grains was accelerated during the cooling process. The increased temperature increases the solubility of RE elements, decreases the viscosity of CMAS, and thus elevates the corrosion reaction rate, making RE₂SiO₅ fast interaction with CMAS and less affected by RE element species.","PeriodicalId":14862,"journal":{"name":"Journal of Advanced Ceramics","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136094179","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Transparent Ce:(Lu,Gd) ₃Al ₅O ₁₂–Al ₂O ₃ nanoceramic color converters elaborated via full glass crystallization for high-power white LED/LD lighting","authors":"Jie Fu, Ying Zhang, Shaowei Feng, Mathieu Allix, Cécile Genevois, Emmanuel Veron, Zhibiao Ma, Wenlong Xu, Linghan Bai, Ruyu Fan, Yafeng Yang, Hui Wang, Jianqiang Li","doi":"10.26599/jac.2023.9220823","DOIUrl":"https://doi.org/10.26599/jac.2023.9220823","url":null,"abstract":"Ce dopped Lu₃Al₅O₁₂ (Ce:LuAG) transparent ceramics are considered as promising color converters for solid-state lighting because of their excellent luminous efficiency, high thermal quenching temperature and good thermal stability. However, Ce:LuAG ceramics mainly emit green light. The shortage of red light as well as the expensive price of Lu compounds are hindering their application for white lighting. In this work, transparent (Lu,Gd)₃Al₅O₁₂-Al₂O₃ (LuGAG-Al₂O₃) nanoceramics with different replacing contents of Gd³⁺ (10%-50%) were successfully elaborated via a glass-crystallization method. The obtained ceramics with full nanoscale grains are composed of main LuGAG crystalline phase and secondary Al₂O₃ phase, exhibiting eminent transparency of 81.0%@780 nm. After doping by Ce³⁺, the Ce:LuGAG-Al₂O₃ nanoceramics show a significant red shift (510 nm→550 nm) and makes up for the deficiency of red light component in the emission spectrum. The Ce:LuAG-Al₂O₃ nanoceramics with 20% Gd³⁺ show high internal quantum efficiency (81.5% in IQE, 96.7% of Ce:LuAG-Al₂O₃ nanoceramics) and good thermal stability (only 9% loss in IQE at 150 ℃). When combined with blue LED chips (10 W), 0.3%Ce:LuGAG-Al₂O₃ nanoceramics with 20% Gd³⁺ successfully realize the high quality warm white LED lighting with a color coordinates of (0.3566, 0.435), a color temperature of 4347 K, a CRI of 67.7 and a luminous efficiency of 175.8 lm·W^-1. When the transparent 0.3%Ce:LuGAG-Al₂O₃ nanoceramics are excited by blue laser (5 W·mm^-2), the emission peak position red shifts from 517 nm to 570 nm, the emitted light exhibits a continuous change from green to yellow light green light to orange-yellow light and the maximum luminous efficiency is up to 234.49 lm·W^-1 (20% Gd³⁺). Taking into account the high quantum efficiency, good thermal stability, excellent and adjustable luminous properties, the transparent Ce:LuGAG-Al₂O₃ nanoceramics with different Gd³⁺ substitution contents in this paper are believed to be promising candidates for high-power white LED/LD lighting.","PeriodicalId":14862,"journal":{"name":"Journal of Advanced Ceramics","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136094358","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Repelling effects of Mg on the diffusion of He atoms towards surface in SiC: Irradiation and annealing experiments combined with the first-principles calculations","authors":"Min Liu, Qiqi Li, Jun Hui, Yongfeng Yan, Renduo Liu, Biao Wang","doi":"10.26599/jac.2023.9220820","DOIUrl":"https://doi.org/10.26599/jac.2023.9220820","url":null,"abstract":"In this study, the effects of Mg on the formation of He bubbles and diffusion behavior of He atoms in 3C-SiC were investigated by irradiation and annealing experiment as well as the first-principles calculations. TEM results indicated that two damage bands were formed in the He&Mg irradiated SiC. During annealing, Mg could prevent He atoms from diffusing to the surface, resulting in the formation of He bubbles in the deeper areas far from the Mg-implanted regions, which is helpful to avoid the surface blisters. First-principles calculations were then performed to explore the effects of Mg on the He behavior in SiC. The solution energy, binding energy charge density, bond length, and crystal orbital Hamiltonian population of these elements were calculated to identify their states. The results suggested that the binding capacity between He and Mg was weak, and Mg could increase the diffusion energy barrier of He. AIMD simulation showed that Mg could make He in a high-energy unstable state, and force He atom to move toward the vacancy away from Mg, which explains the experimental results.","PeriodicalId":14862,"journal":{"name":"Journal of Advanced Ceramics","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135849581","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"From binary to ternary and back to binary: Transition of electromagnetic wave shielding to absorption among MAB phase Ni ₃ZnB ₂ and corresponding binary borides Ni <em> _n </em> ₊₁B <em> _n </em>( <em>n</em>= 1, 3)","authors":"Chengwen Wu, Fan Zhang, Qin Zhi, Bo Song, Yongqiang Chen, Hailong Wang, Rui Zhang, Hongxia Li, Bingbing Fan","doi":"10.26599/jac.2023.9220812","DOIUrl":"https://doi.org/10.26599/jac.2023.9220812","url":null,"abstract":"Due to the chemical inertness of nickel and boron, the preparation of nickel borides and corresponding layered ternary transition metal borides Ni₃ZnB₂ (MAB phase) has always required high-temperature and/or high-pressure conditions. Yet, an innovative and efficient approach to prepare Ni₃ZnB₂ at only 600 °C and without applied pressure is presented in this study. It is discovered that by simply adjusting the temperature, a phase transition from Ni₃ZnB₂ to Ni₄B₃ with a layered structure could be induced. This transition between binary-component and ternary-component brings about significant variation of electromagnetic wave (EMW) shielding/absorption performance of prepared borides. For instance, Ni₂B is of good EMW shielding performance (42.54 dB in X band) and Ni₃ZnB₂ is of weak EMW shielding (13.43 dB in X band); Ni₃ZnB₂ has poor EMW absorption performance (-5 dB) while Ni₄B₃ has excellent EMW absorption performance (-45.19 dB) at a thickness of 2.7 mm with effective absorption bandwidth (10.4 GHz).","PeriodicalId":14862,"journal":{"name":"Journal of Advanced Ceramics","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135605966","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Revealing the low thermal conductivity of high-entropy rare-earth tantalates via multiscale defects analysis","authors":"Jun Wang, Qianqian Jin, Jianbo Song, Di Zhang, Bin Xu, Zhiyi Ren, Meng Wang, Shixiao Yan, Xiaoliang Sun, Chi Liu, Xiaoyu Chong, Jing Feng","doi":"10.26599/jac.2023.9220811","DOIUrl":"https://doi.org/10.26599/jac.2023.9220811","url":null,"abstract":"Thermal barrier coatings (TBCs) materials can improve energy conversion efficiency and reduce fossil fuel use. Herein, the novel rare earth tantalates RETaO₄, as promising candidates for TBCs, were reassembled into multi-component solid solutions with a monoclinic structure to further depress the thermal conductivity via an entropy strategy. The formation mechanisms of oxygen vacancy defects, dislocations and ferroelastic domains associated with thermal conductivity are demonstrated by aberration-corrected scanning transmission electron microscopy. Compared to single-RE RETaO₄ and 8YSZ, the intrinsic thermal conductivity of (5RE_1/5)TaO₄ was decreased by 35% ~ 47% and 57% ~ 69% at 1200°C, respectively, which is likely attributed to the multi-scale phonon scattering from Umklapp phonon–phonon, point defects, domain structures and dislocations. &nbsp;and low-temperature thermal conductivity are negatively correlated, as are <em>E/κ</em> and high-temperature thermal conductivity. Meanwhile, the high defects' concentration and lattice distortion in high-entropy ceramics enhances the scattering of transverse-wave phonons and reduces the transverse-wave sound velocity, leading to a decrease in the thermal conductivity and Young's modulus. In addition, 5HEC-1 has ultra-low thermal conductivity, moderate thermal expansion coefficients and high hardness among the three five-component high-entropy samples. Thus, 5HEC-1 with superior thermal barrier and mechanical properties can be used as a promising thermal insulating material.","PeriodicalId":14862,"journal":{"name":"Journal of Advanced Ceramics","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135568225","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Enhancing the thermal conductivity of nanofibrillated cellulose films with 1D BN belts formed by in-situ generation and sintering of BN nanosheets","authors":"Baokai Wang, Zheng Zhao, Mengyi Li, Mengyang Niu, Jialu Tian, Chang Yu, Shiqin Wan, Ming Yue, Weiwei Xuan, Wenbin Cao, Zhaobo Tian, Kexin Chen, Qi Wang","doi":"10.26599/jac.2023.9220817","DOIUrl":"https://doi.org/10.26599/jac.2023.9220817","url":null,"abstract":"The rapid miniaturization and high integration of modern electronic devices have brought an increasing demand for polymer-based thermal management materials with higher thermal conductivity. Boron nitride nanosheets (BNNS) have been widely used as thermally conductive fillers benefiting from the extremely high intrinsic thermal conductivity. However, the small lateral size and weak interface bonding of BNNS enabled them to only form thermally conductive networks through physical overlap, resulting in high interfacial thermal resistance. To address this issue, an innovative strategy based on interface engineering was proposed in this study. High-aspect-ratio boron nitride belts (BNb) were successfully synthesized by carbon thermal reduction nitridation method through the in-situ generation and sintering of BNNS. The surface of BNb showed the sintering of numerous smaller-sized BNNS, which precisely addresses the issue of weak interfacial bonding between BNNS. On this basis, the as-synthesized BNb were combined with nano-fibrillated cellulose (NFC) to prepare NFC/BNb composite films through a facile vacuum filtration process. Due to the thermally conductive network formed by the horizontal oriented arrangement of BNb and their particular morphological advantages, the NFC/BNb films demonstrated significantly higher in-plane thermal conductivity than that of NFC/BNNS films, achieving a highest value of 19.119 W·m^-1·K^-1 at a 20 wt% filling fraction. In addition, the NFC/BNb films also exhibited superior thermal stability, mechanical strength, flexibility and electrical insulation performance, suggesting the significant application potential of the designed BNb fillers in the thermal management field.","PeriodicalId":14862,"journal":{"name":"Journal of Advanced Ceramics","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135606031","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Accuracy controlling and mechanical behaviors of precursor-derived SiOC ceramic microlattices by projection micro stereolithography (P&amp;mu;SL) 3D printing","authors":"Ruyue Su, Jingyi Chen, Xueqin Zhang, Xiong Gao, Wenqing Wang, Ying Li, Rujie He","doi":"10.26599/jac.2023.9220818","DOIUrl":"https://doi.org/10.26599/jac.2023.9220818","url":null,"abstract":"Precursor-derived SiOC ceramic (PDC-SiOC) microlattices exhibit excellent oxidation resistance, high-temperature stability, as well as superior mechanical properties. However, the printing accuracy of PDC-SiOC microlattices by 3D printing is still limited, and the mechanical properties of PDC-SiOC microlattices have not been studied systematically. Here, PDC-SiOC octet microlattices were fabricated by projection micro stereolithography (PμSL) 3D printing, and photoabsorber (Sudan III) 's effect on accuracy was systematically analyzed. The results showed that the addition of Sudan III improved the printing accuracy significantly. Then the ceramization process of the green body was analyzed in detail. The order of the green body decreased and most of their chemical bonds were broken during pyrolysis. After that, PDC-SiOC microlattices with different truss diameters in the 52-220 μm range were fabricated and their mechanical properties were investigated. The PDC-SiOC microlattices with 52 μm truss diameter exhibited a higher compression strength (31 MPa) than those with bigger truss diameters. The size effect among PDC-SiOC microlattices was analyzed. Our work provides a deeper insight into the manufacturing of PDC-SiOC micro-scaled architectures by 3D printing and paves a path to the research of size effect in ceramic structures.","PeriodicalId":14862,"journal":{"name":"Journal of Advanced Ceramics","volume":"98 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135654195","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Colossal permittivity and ultralow dielectric loss in Nb-doped SrTiO ₃ ceramics","authors":"Jinghan Cai, Junlei Qi, Yueyang Yang, Xinyue Zhang, Yuan-Hua Lin","doi":"10.26599/jac.2023.9220815","DOIUrl":"https://doi.org/10.26599/jac.2023.9220815","url":null,"abstract":"Defect engineering has been applied to prepare materials with modifiable dielectric properties. SrTiNb_xO₃ (x=0, 0.003, 0.006, 0.009, 0.012) ceramics were synthesized using the traditional solid-state reaction method and sintered in a reducing atmosphere. All samples show excellent dielectric properties with giant permittivity (>3.5×10⁴) and low dielectric loss (<0.01). SrTiNb_0.003O₃ ceramic exhibits a colossal permittivity of 4.6×10⁴ and an ultralow dielectric loss of 0.005 (1 kHz, room temperature) as well as great temperature stability in the range of -60～160℃. The mechanism of the presented CP properties is investigated by conducting XPS and analyzing activation energies. The results indicate that the introduction of Nb⁵⁺ and the reducing sintering atmosphere together generated the formation of Ti³⁺ and <em>V ^∙∙_O</em>. These defects further form <em>Ti'_Ti−</em><em>V ^∙∙</em>_O−<em>Ti'_Ti</em> defect dipoles, contributing to the coexisting giant permittivity and low dielectric loss in STN ceramics.","PeriodicalId":14862,"journal":{"name":"Journal of Advanced Ceramics","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135606032","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}