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| 1 | Enhanced giant dielectric properties and improved nonlinear electrical response in acceptor-donor (Al^(3+), Ta^(5+))-substituted CaCu_(3)Ti_(4)0_(12) ceramics显示文摘The giant dielectric bchavior of CaCu_(3)Ti_(4)0_(12)(CCTO)has been widely investigated owing to its potential applications in electronics;however,the loss tangent(tan8)of this material is too large for many applications.A partial substitution of CCTO ceramics with either Al^(3+) or Ta^(5+)-ions generally results in poorer nonlinear properties and an associated increase in tan8(to~0.29-1.15).However,first-principles calculations showed that self-charge compensation occurs between these two dopant ions when co-doped into Tit sites,which can improve the electrical properties of the grain boundary(GB).Surprisingly,in this study,a greatly enhanced breakdown electric field(~200--6588 V/cm)and nonlinear coefficient(-4.8-15.2)with a significantly reduced tan8(~0.010--0.036)were obtained by simultaneous partial substitution of CCTO with acceptor-donor(Al^(3+),Ta^(5+))dopants to produce(Al^(3+),Ta^(5+))-CCTO ceramics.The reduced tan8 and improved nonlinear properties were attributed to the synergistic effects of the co-dopants in the doped CCTO structure.The signifcant reduction in the mean grain size of the(Al^(3+),Ta^(5+))-CCTO ceramics compared to pure CCTO was mainly because of the Ta^(5+)-ions.Accordingly,the increased GB density due to the reduced grain size and the larger Schottky barrier height(Ф_(b))at the GBs of the co-doped CCTO ceramics were the main reasons for the greatly increased GB resistance,improved nonlinear properties,and reduced tan8 values compared to pure and single-doped CCTO.In addition,high dielectric constant values(ε'≈(0.52-2.7)×10^(4))were obtained.A fine-grained microstructure with highly insulating GBs was obtained by Ta doping,while co-doping with Ta^(5+) and Al^(3+ )resulted in a high Ф_(b).The obtained results are expected to provide useful guidelines for developing new giant dielectric ceramics with excellent dielectric properties. | Jakkree BOONLAKHORN Narong CHANLEK Jedsada MANYAM Pornjuk SREPUSHARAWOOT Sriprajak KRONGSUK Prasit THONGBAI | 2021 | Journal of Advanced Ceramics2021，10，6： | 2 |
| 2 | Non-Ohmic and dielectric properties of CaCu 3 Ti 4 O 12 -MgO nanocomposites显示文摘 | Prasit Thongbai Teerapon Yamwong Santi Maensiri | 2013 | Microelectronic Engineering2013，，： | 1 |
| 3 | Nanocrystalline CaCu3Ti4O12 powder by PVA sol–gel route: synthesis, characterization and its giant dielectric constant显示文摘 | Chivalrat Masingboon Prasit Thongbai Santi Maensiri Teerapon Yamwong | 2009 | Applied Physics A2009，，3： | 1 |
| 4 | Enhancement of output power density in a modified polytetrafluoroethylene surface using a sequential O_(2)/Ar plasma etching for triboelectric nanogenerator applications显示文摘In this work,the surface modification using a two-steps plasma etching has been developed for enhancing energy conversion performance in polytetrafluoroethylene(PTFE)triboelectric nanogenerator(TENG).Enhancing surface area by a powerful O_(2) and Ar bipolar pulse plasma etching without the use of CF_(4) gas has been demonstrated for the first time.TENG with modified surface PTFE using a sequential two-step O_(2)/Ar plasma has a superior power density of 9.9 W·m^(-2),which is almost thirty times higher than that of a pristine PTFE TENG.The synergistic combination of high surface area and charge trapping sites due to chemical bond defects achieved from the use of a sequential O_(2)/Ar plasma gives rise to the intensified triboelectric charge density and the enhancement of power output of PTFE-based TENG.The effects of plasma species and plasma etching sequence on surface morphologies and surface chemical species were investigated by a field emission scanning electron microscopy(FESEM),atomic force microscopy(AFM),and X-ray photoelectron spectroscopy(XPS).The correlation of surface morphology,chemical structure,and TENG performance was elucidated.In addition,the applications of mechanical energy harvesting for lighting,charging capacitors,keyboard sensing and operating a portable calculator were demonstrated. | Teerayut Prada Viyada Harnchana Anthika Lakhonchai Artit Chingsungnoen Phitsanu Poolcharuansin Narong Chanlek Annop Klamchuen Prasit Thongbai Vittaya Amornkitbamrung | 2022 | Nano Research2022，15，1： | 0 |
| 5 | Ultraelow loss tangent and giant dielectric permittivity with excellent temperature stability of TiO_(2) co-doped with isovalent-Zr4þ/ pentavalent-Ta5þ ions显示文摘The excellent giant dielectric properties(ExGDPs)are represented in the isovalenteZr4þ/pentavalent eTa5þions coedoped TiO_(2) with different coedoping percentages(x%ZrTTO).The dopants were dispersed homogeneously in a highly compactegrained ZrTTO microstructure.The mean grain size and cell parameters with bond lengths slightly enlarged as x%increased.The(1%e5%)ZrTTO oxides exhibited ultra elow tand values of 0.004e0.016 with the giant dielectric permittivity(ε0~2.7e3.7104);while theε0 of the 5%ZrTTO was slightly dependent on the temperature ranging from--60 to 200C,following the temperature dependence requirement for application in the X7/8/9R capacitors.Impedance spectroscopy showed a very large resistance of the grain boundaries.The dielectric properties of the 1%ZrTTO were strongly dependent on the applied DC electric field,indicating the dominant internal barrier layer capacitor(IBLC)effect.However,the dielectric properties of the 5%ZrTTO were nearly independent on the applied DC electric field up to 30 V/mm,which was primarily resulted from electron localization in defect dipoles.Therefore,the ExGDPs of the x%ZrTTO were attributed to the combined effects of the IBLC and localizedeelectron defectedipoles related to oxygen vacancies(Ti4þ,e--VO--e--,Ti4þand 3Ti4þ,e----VO--TaTi)and Ti4þ,e--TaTi. | Yasumin Mingmuang Narong Chanlek Prasit Thongbai | 2022 | Journal of Materiomics2022，8，6： | 0 |
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