Journal of Electroceramics最新文献

{"title":"Influence of lithium on Cu-doped ZnO thin films fabricated via sol-gel spin coating technique for improved NO2 gas sensing applications","authors":"K. K. Jasmi,&nbsp;T. Anto Johny,&nbsp;V. S. Siril,&nbsp;K. N. Madhusoodanan","doi":"10.1007/s10832-024-00350-4","DOIUrl":"10.1007/s10832-024-00350-4","url":null,"abstract":"<div><p>We demonstrate the influence of lithium on copper-doped ZnO-based thin films for improved NO₂ gas sensing applications fabricated via the sol-gel spin coating technique. Structure studies confirmed hexagonal wurtzite structure and morphological analysis showed evenly dispersed, agglomerated spherical particles with an average grain size ranging from 25.94 to 30.79 nm. Lithium-doped Cu-ZnO with more surface oxygen vacancies and a higher carrier density demonstrated outstanding NO₂ gas sensitivity, excellent repeatability, excellent stability, and high selectivity at 210 °C. A possible gas-sensing mechanism is also discussed and correlated with structural, morphological, spectral, and electrical parameters.</p></div>","PeriodicalId":625,"journal":{"name":"Journal of Electroceramics","volume":"52 2","pages":"125 - 134"},"PeriodicalIF":1.7,"publicationDate":"2024-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140625121","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}

{"title":"Effect of annealing temperature on the structure and dielectric characterization of ITO thin films on a boro-float substrate prepared by radio frequency sputtering","authors":"A. Hakamy,&nbsp;A. M. Mebed,&nbsp;A. Sedky,&nbsp;Alaa M. Abd-Elnaiem","doi":"10.1007/s10832-024-00348-y","DOIUrl":"10.1007/s10832-024-00348-y","url":null,"abstract":"<div><p>The effect of annealing temperature (T_a= 200, 250, and 300 °C) on the structural properties, ac conductivity, and complex dielectric constants (<span>({epsilon }^{{prime }})</span> and <span>({epsilon }^{{prime }{prime }})</span>) of indium-doped tin oxide (ITO) thin films (~ 90 nm thick)/0.5 mm boro-float substrates (BFS) synthesized by radio frequency (RF) sputtering is investigated. The X-ray diffraction (XRD) examination demonstrated that indium was successfully substituted with tin atoms to form ITO films and the crystallite size for the cubic phase, as well as particle size, were impacted by T_a. The real part of complex dielectric constants (<span>({epsilon }^{{prime }})</span>) was significantly reduced for all ITO/BFS from the range of 2.7 × 10⁴–5.1 × 10⁴ to 5.3–19 as the frequency (<i>f</i>) was increased to 0.25 Hz, while it remained constant for further increases in <i>f</i>. The value of <span>({epsilon }^{{prime }})</span> for the as-prepared ITO/BFS was increased as T_a increased up to 250 °C, then was decreased at T_a=300 °C. A similar finding was detected for the loss factor with no observation of any relaxation peaks. The Q-factor was increased for all ITO/BFS as <i>f</i> increased to 100 Hz and then was reduced with increasing <i>f</i> up to 20 MHz, while steadily increasing with T_a. The deduced frequency exponent is greater than 0.5 for the ITO/BFS, indicating their electronic conduction nature. The density of the localized states and hopping frequency of the ITO/BFS were increased by annealing at 200 °C, meanwhile was decreased for T_a = 300 °C. The binding energy was decreased from 0.647 eV for the as-prepared ITO/BFS to 0.518 eV by annealing at 200 °C, meanwhile was increased to 0.74 and 0.863 eV for T_a equals 250, and 300 °C, respectively. The Cole-Cole plots revealed a single semicircular arc for all films, and their corresponding equivalent circuit was analyzed. The equivalent bulk resistance was gradually decreased by annealing in the range of 200–300 °C, whereas the equivalent capacitance was increased. The resistance of grains and resistance of grain boundaries of the as-prepared ITO/BFS was gradually decreased by increasing T_a to 250 °C, while it was increased for T_a = 300 °C. These outcomes recommended the RF sputtered ITO/BFS for high-frequency devices, integrated circuits, and supercapacitors.</p></div>","PeriodicalId":625,"journal":{"name":"Journal of Electroceramics","volume":"52 2","pages":"115 - 124"},"PeriodicalIF":1.7,"publicationDate":"2024-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140297542","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}

{"title":"Multi-phase structure and optimal properties of (Ba1-xCax)(Ti0.93Zr0.01Sn0.06)O3 ceramics in the MPB range","authors":"Gambheer Singh Kathait,&nbsp;Vishal Rohilla,&nbsp;Surita Maini","doi":"10.1007/s10832-024-00345-1","DOIUrl":"10.1007/s10832-024-00345-1","url":null,"abstract":"<div><p>(0.93 − x)BT − 0.01BZ − 0.06BS − xCT or (Ba_1-xCa_x)(Ti_0.93Zr_0.01Sn_0.06)O₃ (abbreviated as BCZTS) ceramics were produced using the standard solid-state reaction for 0.045 ≤ x ≤ 0.07. For the samples, it was found that orthorhombic (Amm2), rhombohedral (R3m) and tetragonal (P4mm) structures coexisted in two phases as well as three phases with distinct phase fractions. The largest size of crystalline grains was achieved after doping with 0.055 mol% and 0.065 mol% Ca. The optimal properties (P_max = 12.05 μC/cm², P_r = 5.61 μC/cm², E_c = 230 V/mm, d^*₃₃ = 404 pm/V, Q_c = 6.44 µC/cm², T_c = 102 °C) were obtained for x = 0.07 where it has been found that orthorhombic, rhombohedral, and tetragonal phases all occurred at the same time. For compositions in the MPB range, the energy storage characteristics indicate high energy storage efficiency for low value of Ca doping. Given all the developments, it is obvious that Ca, Zr and Sn-doped BCZTS ceramics would be a good choice for lead-free electronics. </p></div>","PeriodicalId":625,"journal":{"name":"Journal of Electroceramics","volume":"52 2","pages":"103 - 114"},"PeriodicalIF":1.7,"publicationDate":"2024-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140297426","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}

{"title":"Effects of radius and electronegativity of donors on the microstructure and mechanical, thermal, and electrical properties of ZnO varistors","authors":"Bo-wen Wang,&nbsp;Jia-zheng Lu,&nbsp;Peng-zhao Gao,&nbsp;Zhi-yao Fu,&nbsp;Zheng-long Jiang,&nbsp;Wei-wei Gong","doi":"10.1007/s10832-024-00349-x","DOIUrl":"10.1007/s10832-024-00349-x","url":null,"abstract":"<div><p>In this paper, influence of radius and electronegativities of seven kinds of donors on the composition, microstructure, mechanical, thermal and electrical properties of ZnO varistors were investigated via XRD, SEM, XPS, mechanical, thermal and electrical properties tests. Results showed that when sintered at 1100 °C for 2 h, the obtained varistors exhibited a dense microstructure, where radius of donors played an important role on the grain size and size distribution of varistors; Mechanical properties and coefficient of thermal expansion of varistors were mainly affected by the radius of donors, with specimen 6# possessing the highest values of 123.46 MPa (σ_f), 80.47 GPa (<i>E</i>_<i>f</i>), and 6.58 × 10⁻⁶ °C⁻¹ (<i>λ</i>_<i>c</i>), respectively; Values of<i> E</i>_<i>1mA</i> and α initially increased and then decreased with the increase of donors’ radius, whereas those of <i>J</i>_<i>L</i> and <i>K</i> exhibited opposite trends. <i>E</i>_<i>1mA</i> and α had maximum values of 569.94 V mm^–1 and 26.70, whereas <i>J</i>_<i>L</i> and <i>K</i> possessed the lowest values of 2.31 μA⋅cm⁻² and 1.35, respectively, when Co²⁺ worked as the donor (specimen 6#). The DC aging process of ZnO varistors obeyed the ion migration mechanism, the radius of donors can affect the number of it entering the ZnO lattice, which can limit the migration of zinc gaps via the formation of substitution and filling defects in the ZnO lattice. The electronegativity of donors can reduce the ion migration speed via the stronger electrostatic force, and specimen 6# possessed the lowest DC aging properties (<i>K</i>_<i>T</i> = 1.68).</p></div>","PeriodicalId":625,"journal":{"name":"Journal of Electroceramics","volume":"52 1","pages":"83 - 102"},"PeriodicalIF":1.7,"publicationDate":"2024-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140200666","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}

{"title":"Structural, electrical and optical investigation of half doped YTi0.5Mn0.5O3 perovskite compounds for optoelectronic devices","authors":"Ghada Raddaoui,&nbsp;Omar Rejaiba,&nbsp;M. Nasri,&nbsp;Omayma Amorri,&nbsp;Kamel Khirouni,&nbsp;E. K. Hlil,&nbsp;J. Khelifi","doi":"10.1007/s10832-024-00344-2","DOIUrl":"10.1007/s10832-024-00344-2","url":null,"abstract":"<div><p>The YTi_0.5Mn_0.5O₃ (YTMO) perovskite was synthesized by the conventional solid-state method. The structural, electrical, dielectric and optical properties were investigated. The X-ray diffraction analysis and Rietveld refinements indicates that sample under study crystallizes in the orthorhombic structure with the Pmmm space group. The impedance spectroscopy studies show a relaxation phenomenon with non-Debye nature. The Nyquist plot confirms the presence of semicircles which, in turn, indicate the existence of both grain and grain boundary effect in the prepared ceramic. The study of AC conductivity has been discussed in detail and designated on the basis of the NSPT conduction mechanism. Activation energy was determined from DC conductivity as well as modulus spectra. The very equal values of the activation energies suggest that the process of the conduction mechanism and the relaxation behavior are similar. The behavior of dielectric constants was interpreted based on the Maxwell–Wagner’s theory of interfacial polarization. Thermodynamic parameters such as enthalpy, entropy have been calculated. From UV–Vis absorption spectrometry, the reflectance spectrum and the Kubelka-Munk model, reveal a direct and wide optical band gap evaluated at 4.69 eV. Moreover, the obtained Urbach energy (0.240 eV) confirms the presence of localized states in the YTMO structure. The extinction coefficient (k) was used to estimate the evolution of the refractive index n with the wavelength. Additionally, the refractive index (n) obeys to Cauchy relation. Furthermore, the dispersion coefficients were analyzed in the bases of Wemple and Di-Domenico model. The optical constants such as the skin depth and the optical conductivity were calculated and the results are discussed.</p></div>","PeriodicalId":625,"journal":{"name":"Journal of Electroceramics","volume":"52 1","pages":"64 - 82"},"PeriodicalIF":1.7,"publicationDate":"2024-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140034417","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}

{"title":"Electrocaloric and energy storage properties of Pb-free 1-x(0.6Ba(Zr0.2Ti0.8)O3 - 0.4(Ba0.7Ca0.3)TiO3)-x(BiTa0.5La0.5)O3 relaxor ferroelectric ceramics","authors":"Nagarajan Sreekala Kiran Kumar,&nbsp;Pilikudlu Madhushree,&nbsp;Koppole Chandra Sekhar","doi":"10.1007/s10832-023-00343-9","DOIUrl":"10.1007/s10832-023-00343-9","url":null,"abstract":"<div><p>This work highlights the electrocaloric (EC) and energy storage (ES) properties of 1-x(0.6Ba(Zr_0.2Ti_0.8)O₃-0.4(Ba_0.7Ca_0.3)TiO₃)-x(BiTa_0.5La_0.5)O₃ (1-xBZCT-xBTL) ceramics with x = 0 to 0.05. The XRD studies revealed that inclusion of BTL content in BZCT does not induce any impurity phase. The peak splitting of BZCT near 2θ = 45<span>(^circ)</span> and 66<span>(^circ)</span> confirms the presence of morphotropic phase boundary corresponding to tetragonal and rhombohedral phases. Further, the solid solution formation of BZCT-BTL has suppressed its morphotropic phase boundary behaviour. The XRD, Raman and temperature dependent dielectric studies suggest the presence of pseudocubic phase in 1-xBZCT-xBTL at higher values of x = 0.025 and 0.05. Moreover, the inclusion of BTL boosts the diffused phase transition behaviour of BZCT ceramics. Further, BTL strengthened its relaxor nature due to a reduction in grain size as evidenced from SEM analysis. It is observed that the 0.99BZCT-0.01BTL ceramics show 95% efficiency and a maximum recoverable energy density of 479 mJ/cm³ at 100 kV/cm. Moreover, the electrocaloric temperature change and responsivity are found to be 1.06 K and 0.01 Kcm/kV near the transition temperature.</p></div>","PeriodicalId":625,"journal":{"name":"Journal of Electroceramics","volume":"52 1","pages":"51 - 63"},"PeriodicalIF":1.7,"publicationDate":"2024-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139476369","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}

{"title":"Enhanced structure and microwave dielectric properties of low-temperature sintering Li2Mg1 − xCaxSiO4 ceramics by Ca2+ ion substitution","authors":"Wei Li,&nbsp;Jie Li,&nbsp;Yixin Chen,&nbsp;Kai Sun,&nbsp;Shuai Wang,&nbsp;Yingli Liu,&nbsp;Zhaoyun Duan","doi":"10.1007/s10832-023-00342-w","DOIUrl":"10.1007/s10832-023-00342-w","url":null,"abstract":"<div><p>In this paper, the Ca²⁺ ion was chosen to substitute the Mg²⁺ ion of Li₂MgSiO₄ ceramics. Li₂Mg_1 − xCa_xSiO₄ (x = 0.0, 0.03, 0.06, 0.09, 0.12) ceramics materials were prepared by solid state reaction at low temperature (925 °C) with 2.5wt% Bi₂O₃ sintering aid. X-ray diffraction (XRD) results showed the ceramics presented the standard Lithium Magnesium Silicate phase formation, and no secondary phases appeared. Scanning electron microscopy (SEM) suggested that Ca²⁺ ions affected the densification of the prepared ceramics. Ca²⁺ ion substitution resulted in increasing relative density, enhancing microwave properties. Ca²⁺ ion substituted Mg²⁺ ion and formed a CaO4 structure, which affected microwave dielectric properties. With the substituted amount increase, the values of dielectric constant ε’ and quality factor <i>Q×f</i> gradually increased, and τ_<i>f</i> values increased from negative to positive values. When x = 0.09 and sintered at 925 °C, Ca²⁺ ion substitution gave ceramics excellent microwave properties: bulk density ρ = 2.479 g/cm³, relative density was 98.68%, dielectric constant ε’=6.59, dielectric loss tanδ_ε = 0.0018, quality factor <i>Q×f</i> = 8976.9 GHz and temperature coefficient τ_f = 1.9 ppm/°C. This ceramic material has excellent microwave dielectric properties and holds a potential for use in integrated antenna and other electronic devices.</p></div>","PeriodicalId":625,"journal":{"name":"Journal of Electroceramics","volume":"52 1","pages":"42 - 50"},"PeriodicalIF":1.7,"publicationDate":"2023-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138516001","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}

{"title":"Comparative study of Mn2+ and Zr4+ co-substituted Zn-Co spinel ferrites as microwave absorbing materials in Ku (12.4–18 GHz) and K (18-26.5 GHz) frequency bands","authors":"Mandeep Kaur,&nbsp;Shalini Bahel","doi":"10.1007/s10832-023-00341-x","DOIUrl":"10.1007/s10832-023-00341-x","url":null,"abstract":"<div><p>The present research work aims to address the rising demand for microwave-absorbing materials (MAMs) due to the relentless growth of detrimental electromagnetic wave pollution. Herein, the absorption behavior of manganese-zirconium co-substituted zinc-cobalt spinel ferrites with chemical composition Zn_0.25Co_0.75(MnZr)_xFe_2−2xO₄ (0.05 ≤ x ≤ 0.25, ∆x = 0.05) were investigated in the Ku (12.4–18 GHz) and K (18-26.5 GHz) frequency bands. Samples of Mn-Zr-Zn-Co ferrites were successfully synthesized via the sol-gel citrate route with sintering at a temperature of 1000 °C for 6 h. Fourier transform infrared spectroscopy (FT-IR) confirmed the presence of two vibrational peaks in the spinel lattice structure. The complex dielectric permittivity and complex magnetic permeability were measured using a vector network analyzer (VNA). The composition MZ 0.15 outperformed all the prepared compositions by exhibiting a minimum reflection loss of -34.55 dB at a matching frequency of 15.09 GHz and a matching thickness of 2.7 mm in Ku-band and a reflection loss as low as -30.40 dB at a matching frequency of 25.48 GHz and a matching thickness of 1.5 mm in K-band. The obtained results indicate that the fabricated specimens have the potential for designing efficient microwave-absorbing materials in the Ku and K frequency bands.</p></div>","PeriodicalId":625,"journal":{"name":"Journal of Electroceramics","volume":"52 1","pages":"29 - 41"},"PeriodicalIF":1.7,"publicationDate":"2023-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138515959","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}

{"title":"Back to basics: synthesis of metal oxides","authors":"Clement Nicollet,&nbsp;Alfonso J. Carrillo","doi":"10.1007/s10832-023-00340-y","DOIUrl":"10.1007/s10832-023-00340-y","url":null,"abstract":"<div><p>Synthesis of metal oxides is typically the first step of any materials science research in a field or application involving oxides materials. However, the synthesis is rarely the prime focus in materials science, which usually describe properties and characterizations of said materials. Consequently, synthesis protocols are often given too little attention in the literature and hence poorly described. For scientists starting in the field, it becomes confusing to make the right choice of synthesis route and conditions to successfully prepare what will be the base of their research, which is a pure, single phase, complex oxide powder. With this tutorial article, we are giving basic knowledge on the underlying chemistry of oxide synthesis, and simple explanations on what motivates the need of various synthesis routes. Then, four main synthesis routes are described, namely the solid state reaction route, the Pechini route, the combustion route, and the precipitation route. For each routes, the approach is described, and the relevant parameters to be considered are developed. Finally, a step by step general protocol for each route is proposed, which can serve as a solid foundation for unexperienced researchers to become more confident when approaching metal oxide synthesis.</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":625,"journal":{"name":"Journal of Electroceramics","volume":"52 1","pages":"10 - 28"},"PeriodicalIF":1.7,"publicationDate":"2023-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138515963","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}

{"title":"Phenolic resin-based carbon aerogel composite reinforced by aluminum silicate ceramic fibers","authors":"Sirui Cao,&nbsp;Yunhui Dou,&nbsp;Yufeng Jiao,&nbsp;Shujuan Liu,&nbsp;Dongmei Liu,&nbsp;Meili Qi,&nbsp;Ming Hu","doi":"10.1007/s10832-023-00339-5","DOIUrl":"10.1007/s10832-023-00339-5","url":null,"abstract":"<div><p>In this work, phenolic resin (PR) -based carbon aerogel composites reinforced with aluminum silicate ceramic fibers were obtained using the conventional sol-gel method with the carbonization technique. The experiment results showed that carbon aerogel with stable morphology was obtained by drying the PR wet gel at room temperature. Reactant ratios affected the microstructure and overall performance of carbon aerogels. The overall discharge capacity of the obtained carbon aerogel specimens was maintained at 330 mAh g⁻¹ when the mass ratio of phenolic resin to curing agent was 8:1. The growth of aerogel particles was guided during the curing reaction. A three-dimensional network structure with ceramic fibers as the core was formed in PR/CF. The ceramic fibers suppressed the shrinkage of the samples, and the ceramic fibers improved the mechanical properties of the samples.</p></div>","PeriodicalId":625,"journal":{"name":"Journal of Electroceramics","volume":"52 1","pages":"3 - 9"},"PeriodicalIF":1.7,"publicationDate":"2023-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138515967","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}