{"title":"In situ polymerized polyetherimide/Al2O3 nanocomposites with significantly improved capacitive energy storage performance at high temperatures","authors":"","doi":"10.1016/j.jmat.2024.03.001","DOIUrl":"10.1016/j.jmat.2024.03.001","url":null,"abstract":"<div><p>High-temperature polymer nanocomposites with high energy storage density (<em>U</em><sub>e</sub>) are promising dielectrics for capacitors used in electric vehicles, aerospace, <em>etc</em>. However, filler agglomeration and interface defects at high filler loadings significantly limit the enhancement of <em>U</em><sub>e</sub> and hamper the large-scale production of the nanocomposites. Here, polyetherimide (PEI) nanocomposites with nanoscale alumina (AO) at ultra-low contents were prepared <em>via in situ</em> polymerization from PEI monomers. We compared two composite dielectric preparation methods (<em>in situ</em> polymerization and ordinary solution blending) under the same conditions. In contrast to the nanocomposites obtained by blending PEI polymers with AO, the <em>in situ</em> nanocomposites exhibit substantially improved filler dispersion, together with largely suppressed conduction loss at high fields and high temperatures, leading to comprehensive enhancements of breakdown strength (<em>E</em><sub>b</sub>), charge-discharge efficiency (<em>η</em>) and <em>U</em><sub>e</sub>, simultaneously. The 0.3% (in volume) AO filled PEI nanocomposite film exhibits a superior <em>U</em><sub>e</sub> of 4.8 J/cm<sup>3</sup> with <em>η</em> of 90% at 150 °C, which is 128% and 218% higher than those of pristine PEI and the <em>ex situ</em> PEI/AO nanocomposite film under the same conditions, respectively. This work provides a scalable strategy for the preparation of dielectrics with both good processability and excellent high-temperature energy storage performance.</p></div>","PeriodicalId":16173,"journal":{"name":"Journal of Materiomics","volume":"11 1","pages":"Article 100852"},"PeriodicalIF":8.4,"publicationDate":"2024-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2352847824000467/pdfft?md5=441cf5379ddbea12e94436106f73d144&pid=1-s2.0-S2352847824000467-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140146219","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Crystal, ferromagnetism, and magnetoresistance with sign reversal in a EuAgP semiconductor","authors":"","doi":"10.1016/j.jmat.2024.02.012","DOIUrl":"10.1016/j.jmat.2024.02.012","url":null,"abstract":"<div><p>We synthesized the ferromagnetic EuAgP semiconductor and conducted a comprehensive study of its crystalline, magnetic, heat capacity, band gap, and magnetoresistance properties. Our investigation utilized a combination of X-ray diffraction, optical, and PPMS DynaCool measurements. EuAgP adopts a hexagonal structure with the <em>P</em>6<sub>3</sub>/<em>mmc</em> space group. As the temperature decreases, it undergoes a magnetic phase transition from high-temperature paramagnetism to low-temperature ferromagnetism. We determined the ferromagnetic transition temperature to be <em>T</em><sub>C</sub> = 16.45(1) K by fitting the measured magnetic susceptibility using a Curie-Weiss law. Heat capacity analysis of EuAgP considered contributions from electrons, phonons, and magnons, revealing <em>η</em> = 0.03 J/(mol·K<sup>2</sup>), indicative of semiconducting behavior. Additionally, we calculated a band gap of ∼1.324(4) eV based on absorption spectrum measurements. The resistivity versus temperature of EuAgP measured in the absence of an applied magnetic field shows a pronounced peak around <em>T</em><sub>C</sub>, which diminishes rapidly with increasing applied magnetic fields, ranging from 1 to 14 T. An intriguing phenomenon emerges in the form of a distinct magnetoresistance transition, shifting from positive (<em>e.g.</em>, 1.95% at 300 K and 14 T) to negative (<em>e.g.</em>, −30.73% at 14.25 K and 14 T) as the temperature decreases. This behavior could be attributed to spin-disordered scattering.</p></div>","PeriodicalId":16173,"journal":{"name":"Journal of Materiomics","volume":"11 1","pages":"Article 100853"},"PeriodicalIF":8.4,"publicationDate":"2024-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2352847824000479/pdfft?md5=7a08436b68bdecb3406806042e7a6e90&pid=1-s2.0-S2352847824000479-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140146220","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Faris Sweidan , Diogo Ribeiro Costa , Huan Liu , Pär Olsson
{"title":"Temperature-dependent thermal conductivity and fuel performance of UN-UO2 and UN-X-UO2 (X=Mo, W) composite nuclear fuels by finite element modeling","authors":"Faris Sweidan , Diogo Ribeiro Costa , Huan Liu , Pär Olsson","doi":"10.1016/j.jmat.2024.02.007","DOIUrl":"10.1016/j.jmat.2024.02.007","url":null,"abstract":"<div><p>The temperature-dependent effective thermal conductivity of UN-X-UO<sub>2</sub> (X = Mo, W) nuclear fuel composite was estimated. Following the experimental design, the thermal conductivity was calculated using Finite Element Modeling (FEM), and compared with analytical models for 10%, 30%, 50%, and 70% (in mass) uncoated/coated UN microspheres in a UO<sub>2</sub> matrix. The FEM results show an increase in the fuel thermal conductivity as the mass fraction of the UN microspheres increases from 1.2 to 4.6 times the UO<sub>2</sub> reference at 2,000 K. The results from analytical models agree with the thermal conductivity estimated by FEM. The results also show that Mo and W coatings have similar thermal behaviors, and the coating thickness influences the thermal conductivity of the composite. At higher weight fractions, the thermal conductivity of the fuel composite at room temperature is substantially influenced by the high thermal conductivity coatings approaching that of UN. Thereafter, the thermal conductivity from FEM was used in the fuel thermal performance evaluation during LWR normal operation to calculate the maximum centerline temperature. The results show a significant decrease in the fuel maximum centerline temperature ranging from −94 K for 10% UN to −414 K for 70% (in mass) UN compared to UO<sub>2</sub> under the same operating conditions.</p></div>","PeriodicalId":16173,"journal":{"name":"Journal of Materiomics","volume":"10 4","pages":"Pages 937-946"},"PeriodicalIF":9.4,"publicationDate":"2024-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2352847824000418/pdfft?md5=2d02cf5b62976a00b6579a6b7a3528e6&pid=1-s2.0-S2352847824000418-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140146211","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"C/C-HfC-SiC composites with simultaneous the resistance to ultra-high temperature airflow erosion and high temperature oxidation","authors":"","doi":"10.1016/j.jmat.2024.02.006","DOIUrl":"10.1016/j.jmat.2024.02.006","url":null,"abstract":"<div><p>HfC-SiC modified C/C composites containing <em>in situ</em> formed Si-HfC-HfSi<sub>2</sub> ablation resistant layer and SiC oxidation resistant layer were successfully prepared by reactive melt infiltration (RMI) combined with gaseous silicon infiltration (GSI). A comparative study was conducted on the anti-oxidation and anti-ablation performance of the C/C-HfC-SiC composites with GSI (noted as RG-CHS) and without GSI (noted as R-CHS). After oxidation at 1,500 °C for 200 min, the oxide film of RG-CHS remained intact. The mass and linear ablation rates decreased from 1.31 mg/s and 7.36 μm/s to 0.12 mg/s and −0.22 μm/s after GSI process, respectively. The introduction of low melting point phases and reducing surface defects can improve the high temperature oxidation resistance and plasma ablation resistance of the composites.</p></div>","PeriodicalId":16173,"journal":{"name":"Journal of Materiomics","volume":"11 1","pages":"Article 100846"},"PeriodicalIF":8.4,"publicationDate":"2024-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2352847824000406/pdfft?md5=dbb97a085637324b6488731f04b92f88&pid=1-s2.0-S2352847824000406-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140146210","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Interpretable machine learning model of effective mass in perovskite oxides with cross-scale features","authors":"","doi":"10.1016/j.jmat.2024.02.008","DOIUrl":"10.1016/j.jmat.2024.02.008","url":null,"abstract":"<div><p>The interpretability of machine learning reveals associations between input features and predicted physical properties in models, which are essential for discovering new materials. However, previous works were mainly devoted to algorithm improvement, while the essential multi-scale characteristics are not well addressed. This paper introduces distortion modes of oxygen octahedrons as cross-scale structural features to bridge chemical compositions and material properties. Combining model-agnostic interpretation methods, we are able to achieve interpretability even using simple machine learning schemes and develop a predictive model of effective mass for a widely used material type, namely perovskite oxides. With this framework, we reach the interpretability of the model, understanding the trend of the effective mass without any prior background information. Moreover, we obtained the knowledge only available to experts, <em>i.e.</em>, the interpretation of effective mass from the s–p orbitals hybridization of B-site cations and O<sup>2−</sup> in ABO<sub>3</sub> perovskite oxides.</p></div>","PeriodicalId":16173,"journal":{"name":"Journal of Materiomics","volume":"11 1","pages":"Article 100848"},"PeriodicalIF":8.4,"publicationDate":"2024-03-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S235284782400042X/pdfft?md5=5080d6b4085aceea317d6d0addea08a4&pid=1-s2.0-S235284782400042X-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140096765","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Medium temperature sintered BaTiO3-based ceramics for X8R capacitors","authors":"","doi":"10.1016/j.jmat.2024.02.005","DOIUrl":"10.1016/j.jmat.2024.02.005","url":null,"abstract":"<div><p>The development of X8R BaTiO<sub>3</sub>-based dielectric materials is of great significance for the high-temperature application of MLCCs. Herein, a series of BaTiO<sub>3</sub>-based dielectric ceramics were prepared by the conventional solid-state method, and the effects of Bi<sub>4</sub>Ti<sub>3</sub>O<sub>12</sub> and Mn<sub>3</sub>O<sub>4</sub> on the properties of BaTiO<sub>3</sub>-based dielectric ceramics were studied. The SEM images show that the addition of Bi<sub>4</sub>Ti<sub>3</sub>O<sub>12</sub> with a low melting point can densify the ceramics at a lower sintering temperature (1,150 °C). TEM images and EDS results indicate that the samples have a “core-shell” structure, which can be optimized by Bi<sub>4</sub>Ti<sub>3</sub>O<sub>12</sub>, resulting in phase transition dispersion and thus improving the temperature stability of the material. The addition of Mn can reduce the dielectric loss of ceramics at high temperatures. As a result, the optimal composition exhibits a high permittivity of 2,090, a low dielectric loss of 1.1%, and high temperature stability satisfying the X8R specification.</p></div>","PeriodicalId":16173,"journal":{"name":"Journal of Materiomics","volume":"11 1","pages":"Article 100845"},"PeriodicalIF":8.4,"publicationDate":"2024-03-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S235284782400039X/pdfft?md5=14f6f2c3c7ca2517b8ba898a3dd3d675&pid=1-s2.0-S235284782400039X-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140096764","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Electromagnetic wave absorption performance and rheological behavior of rubber composites with low mass filling rate carbon nanofiber aerogel","authors":"Zhiyi Zhang , Bicheng Zhou , Lan Jia , Wenwen Yu , Qiang Zheng","doi":"10.1016/j.jmat.2024.02.004","DOIUrl":"10.1016/j.jmat.2024.02.004","url":null,"abstract":"<div><p>With the development of electronic information science and technology, electromagnetic information security and electromagnetic pollution become more and more serious. Electromagnetic wave absorption (EMWA) rubber based on the absorbent of carbon with low density and good corrosion resistance is a kind of good EMWA materials for solving electromagnetic information security and electromagnetic pollution. In this article, three-dimensional network structure carbon nanofiber aerogels (3DNSCAs) are prepared by vacuum annealing of three-dimensional network structure agarose/zinc acetate obtained by freeze-drying of agarose/zinc acetate gel. The EMWA rubber composites with 2.2% (in mass) 3DNSCAs have almost the same density as silicone rubber (PDMS), and the dispersity of 3DNSCAs in PDMS is studied by rheological analysis. The effective absorption bandwidth (EAB, frequency for reflection loss <–10 dB) of the 2 mm thick PDMS/C-800 is 4 GHz, and the minimum value of reflection loss (<span><math><mrow><msub><mtext>RL</mtext><mi>min</mi></msub></mrow></math></span>) is −52 dB with the thickness of 3.5 mm. The PDMS/C-1000 with the thickness of 3.5 mm has an EAB up to 4.8 GHz. Radar cross section (RCS) reduction of PDMS/C-800 can achieve 20 dB⋅m<sup>2</sup> at the frequency of 6 GHz.</p></div>","PeriodicalId":16173,"journal":{"name":"Journal of Materiomics","volume":"10 4","pages":"Pages 928-936"},"PeriodicalIF":9.4,"publicationDate":"2024-03-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2352847824000388/pdfft?md5=9e96171ed0e9bb0e16ceb46e3e6d51f6&pid=1-s2.0-S2352847824000388-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140096799","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Elina Charatsidou , Maria Giamouridou , Andrea Fazi , Gyula Nagy , Diogo Ribeiro Costa , Sarmad Naim Katea , Mikael Jolkkonen , Gunnar Westin , Mattias Thuvander , Daniel Primetzhofer , Pär Olsson
{"title":"Proton irradiation-induced cracking and microstructural defects in UN and (U,Zr)N composite fuels","authors":"Elina Charatsidou , Maria Giamouridou , Andrea Fazi , Gyula Nagy , Diogo Ribeiro Costa , Sarmad Naim Katea , Mikael Jolkkonen , Gunnar Westin , Mattias Thuvander , Daniel Primetzhofer , Pär Olsson","doi":"10.1016/j.jmat.2024.01.014","DOIUrl":"10.1016/j.jmat.2024.01.014","url":null,"abstract":"<div><p>Proton irradiation with a primary ion energy of 2 MeV was used to simulate radiation damage in UN and (U,Zr)N fuel pellets. The pellets, nominally at room temperature, were irradiated to peak levels of 0.1, 1, 10 dpa and 100.0 dpa resulting in a peak hydrogen concentration of at most 90 at. %. Microstructure and mechanical properties of the samples were investigated and compared before and after irradiation. The irradiation induced an increase in hardness, whereas a decrease in Young’s modulus was observed for both samples. Microstructural characterization revealed irradiation-induced cracking, initiated in the bulk of the material, where the peak damage was deposited, propagating towards the surface. Additionally, transmission electron microscopy was used to study irradiation defects. Dislocation loops and fringes were identified and observed to increase in density with increasing dose levels. The high density of irradiation defects and hydrogen implanted are proposed as the main cause of swelling and consequent sample cracking, leading simultaneously to increased hardening and a decrease in Young's modulus.</p></div>","PeriodicalId":16173,"journal":{"name":"Journal of Materiomics","volume":"10 4","pages":"Pages 906-918"},"PeriodicalIF":9.4,"publicationDate":"2024-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2352847824000340/pdfft?md5=126b933b7746d37de2289421747d680c&pid=1-s2.0-S2352847824000340-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140096803","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Fabrication and characterization of V-doped ZnO films implemented to lead-free piezoelectric micromachined devices","authors":"","doi":"10.1016/j.jmat.2024.02.009","DOIUrl":"10.1016/j.jmat.2024.02.009","url":null,"abstract":"<div><p>Piezoelectric micromachined ultrasonic transducers (p-MUTs) have been extensively utilized in medical imaging, range-finding, gesture recognition, and so on. However, the piezoelectric layer is dominated by the toxic Pb(Zr, Ti)O<sub>3</sub>, other materials possess inferior piezoelectric coefficients, and the traditional clamped diaphragm restricts the p-MUT response. In this work, lead-free ZnO films are doped by the vanadium nanostructures and are implemented to beam-island structure membranes, which are aimed to achieve non-toxic and high-performance p-MUTs. Firstly, the doping mechanism of ZnO is analyzed and the p-MUT structure is designed. Secondly, simulation based on the finite element method is conducted to evaluate the dynamic displacement of p-MUTs, after which prototypes are fabricated by the standard micromachined process. The effects of key fabrication parameters including O<sub>2</sub> flow rates, sputtering targets, and annealing temperatures on V-doped ZnO films are investigated in detail. By using atomic force microscopy (AFM) and X-ray diffraction (XRD), the surface morphology and crystal structure of the films are analyzed respectively. Moreover, the piezoelectric properties are measured by piezo response force microscopy (PFM). The results indicate a piezoelectric coefficient as high as 194.5 pm/V, which is superior to most doped ZnO films. Finally, an experimental testing system is established to examine the p-MUT performance. Compared with the clamped diaphragm, the beam-island structure can acquire better electromechanical coupling and achieve range-finding successfully. This work provides a fine application prospect for enhancing the performance of lead-free p-MUTs.</p></div>","PeriodicalId":16173,"journal":{"name":"Journal of Materiomics","volume":"11 1","pages":"Article 100849"},"PeriodicalIF":8.4,"publicationDate":"2024-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2352847824000431/pdfft?md5=42bd1c5e1d88897bfa0685a2f41a9f9b&pid=1-s2.0-S2352847824000431-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140096794","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Polyaniline@cellulose nanofibers multifunctional composite material for supercapacitors, electromagnetic interference shielding and sensing","authors":"","doi":"10.1016/j.jmat.2024.01.015","DOIUrl":"10.1016/j.jmat.2024.01.015","url":null,"abstract":"<div><p>Recently, multifunctional materials have received widespread attention from researchers. Cellulose nanofibers (CNF) is one of biomass materials with abundant hydroxyl groups, which shows great potential in manufacturing multifunctional composite material. In this paper, a kind of polyaniline@CNF/polyvinyl alcohol-H<sub>2</sub>SO<sub>4</sub> multifunctional composite material (PANI@CNF/PVA-H<sub>2</sub>SO<sub>4</sub>) was successfully designed by <em>in-situ</em> chemical polymerization of conductive polyaniline (PANI) onto CNF aerogel with high aspect ratio, and then coated with PVA-H<sub>2</sub>SO<sub>4</sub> gel. The composite material has a specific capacitance of 502.2 F/g at a scan rate of 5 mV/s as supercapacitor electrode. Furthermore, when the composite was assembled into a symmetrical supercapacitor, it can still provide an energy density of 11.49 W·h/kg at a high power density of 413.55 W/kg. Besides, the as-obtained PANI@CNF/PVA-H<sub>2</sub>SO<sub>4</sub> composite has an excellent electromagnetic shielding performance of 34.75 dB in X-band. In addition, due to the excellent flexibility of CNF and PVA, the PANI@CNF/PVA-H<sub>2</sub>SO<sub>4</sub> composites can be further applied to stress sensors to detect pressure and human motion signals.</p></div>","PeriodicalId":16173,"journal":{"name":"Journal of Materiomics","volume":"11 1","pages":"Article 100841"},"PeriodicalIF":8.4,"publicationDate":"2024-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2352847824000352/pdfft?md5=22627ef36239a1c9a4d31f49f5802a80&pid=1-s2.0-S2352847824000352-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140096771","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}