Article(id=1319973056861287147, tenantId=1146029695717560320, journalId=1263187385517883426, issueId=1319973019079000285, articleNumber=null, orderNo=null, doi=10.14062/j.issn.0454-5648.20230749, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1696521600000, receivedDateStr=2023-10-06, revisedDate=1702483200000, revisedDateStr=2023-12-14, acceptedDate=null, acceptedDateStr=null, onlineDate=1792635700669, onlineDateStr=2026-10-22, pubDate=1713542400000, pubDateStr=2024-04-20, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1792635700669, onlineIssueDateStr=2026-10-22, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1792635700669, creator=13701087609, updateTime=1792635700669, updator=13701087609, issue=Issue{id=1319973019079000285, tenantId=1146029695717560320, journalId=1263187385517883426, year='2024', volume='52', issue='4', pageStart='1171', pageEnd='1476', issueExtLink='null', onlineDate='null', pubDate='1713542400000', pubDateStr='2024-04-20', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1792635691661, creator='13701087609', updateTime=1792641833008, updator='13701087609', preIssue=null, nextIssue=null, articleTotal=null, ext={EN=IssueExt(id=1319998777822396474, tenantId=1146029695717560320, journalId=1263187385517883426, issueId=1319973019079000285, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1319998777822396475, tenantId=1146029695717560320, journalId=1263187385517883426, issueId=1319973019079000285, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null, downloadFileDto=null}, startPage=1326, endPage=1334, ext={EN=ArticleExt(id=1319973058580951788, articleId=1319973056861287147, tenantId=1146029695717560320, journalId=1263187385517883426, language=EN, title=Structure, Dielectric and Energy Storage Properties of Sr
0.7Bi
0.2ZrO
3 Modified Bismuth Sodium Titanate Ceramics, columnId=1321894869182828764, journalTitle=Journal of the Chinese Ceramic Society, columnName=Special Issue on Dielectric Energy Storage Materials—Research Article, runingTitle=null, highlight=null, articleAbstract=
Introduction Environmental pollution and energy shortage become more serious. How to effectively store energy and reduce energy loss is a recent challenge. Dielectric ceramic capacitors have some advantages such as long lifespan, fast charging and discharging speed, high power density, and good temperature stability. Na0.5Bi0.5TiO3 (NBT) is a ferroelectric material with an A-site composite ABO3 perovskite structure. The Curie temperature of NBT is 320 ℃, with a large maximum polarization (Pmax) (40-50 μC/cm2) and a wide sintering temperature range. NBT is one of the hot research topics in energy storage ceramics. However, a high remanent polarization (Pr) (~38 μC/cm2) results in low recyclable energy storage density (Wrec) and efficiency (η) for NBT. Introducing a low Pr component into NBT to form a solid solution can refine the polarization-electric field (P-E), and improve the material breakdown strength (BDS) to achieve a high Wrec. In this paper, Ti4+ was replaced in Sr0.7Bi0.2TiO3 by Zr4+. The introduction of Sr0.7Bi0.2ZrO3 (SBZ) could enhance the degree of disorder in the A-site and B-site in the NBT, respectively. The ferroelectric long-range ordered structure was effectively break, further enhancing the relaxor ferroelectricity of NBT ceramics. Zr4+ was chosen instead of Ti4+ because Zr4+ was more stable chemically, and the properties of the material were further improved via introducing ionic radius difference and oxygen vacancies, leading to the lattice distortion. Also, ZrO2 with a larger band gap was conducive to improving BDS and achieving a high energy storage performance.
Methods The (1-x) Na0.5Bi0.5TiO3-xSr0.7Bi0.2ZrO3 (NBT-SBZ, x=0.1, 0.2, 0.3, 0.4) ceramics were synthesized by a solid-phase method. Na2CO3 (99.8%, in mass fraction, the same below), Bi2O3 (99.9%), ZrO2 (99.0%), SrCO3 (99.0%), and TiO2 (98.0%) (National Pharmaceutical Group Chemical Reagent Co., China) were used as raw materials. The raw materials were mixed with alcohol and ground in a ball mill for 24 h. After drying, the powder was calcined at 850 ℃ for 4 h. The green body with a diameter of 12 mm was pressed by cold isostatic pressing at 200 MPa for 3 min. The green body was sintered in air at 1 090-1 150 ℃ for 4 h.
The phase structure of NBT-SBZ ceramic samples was characterized by a model D8 Advance X-ray diffractometer (XRD, Bruker Co., Germany) at 20°-80°. The microstructure was determined by a model S4800 scanning electron microscope (SEM, RIGAKU Co., Japan). The dielectric properties were measured by a model 4980A precision LCR (Agilent Co., USA). The thickness of the dielectric properties sample was 0.6 mm, and a silver electrode was fired at 850 ℃. The P-E loops were tested by a model Premier II ferroelectric analyzer (Radiant Co., USA). The P-E test sample thickness was 0.1 mm and a diameter of 2.0 mm for a gold electrode. The charging and discharging characteristics were determined from a model CFD-003 charging/discharging system (Gogo Co., China). The sample thickness was 0.3 mm, and a silver electrode was fired at 850 ℃.
Results and discussion The XRD pattern of NBT-SBZ ceramics indicates that all the samples exhibit a NBT pseudocubic perovskite structure. ZrO2 and Bi2Ti2O7 second phase appear as the SBZ content increases. A peak at 46.5° (200) shifts towards a lower angle as the SBZ content increases, indicating an increase in the spacing between ceramic crystal planes. The SEM images indicate that the grain size distribution of all the samples is uniform and presents a normal distribution. The average grain size decreases from 1.57 μm for the sample with x of 0.10 μm to 1.06 μm for the sample with x of 0.4 with the increase of SBZ content. The substitution of larger radius ions increases the lattice strain energy and hinders the grain boundary movement, leading to a grain refinement. The grain refinement and reduction of pores are beneficial to obtaining a larger BDS. The dielectric constant (εr) decreases from 870.5 for the sample with x of 0.1 to 668.5 for the sample with x of 0.4 with increasing the frequency due to a decrease in polarization mechanism. As the SBZ content increases, the dielectric loss (tanδ) at 1 kHz decreases from 0.041 for the sample with x of 0.100 to 0.029 for the sample with x of 0.4. All the samples exhibit obvious relaxor ferroelectric characteristics. The P-E loops also change from a typical ferroelectric shape to a thin and elongated shape of a relaxor ferroelectric, and the current density (J)-E current peak becomes rectangular, indicating that the relaxor ferroelectricity of NBT-SBZ ceramics increases with the addition of SBZ. BDS increases from 189.7 kV/cm for the sample with x of 0.1 to 298.1 kV/cm for the sample with x of 0.4, which is consistent with the decrease in average grain size and leakage current density, indicating that small grain size and dense microstructure are important reasons for achieving a high BDS. 0.8NBT-0.2SBZ ceramic with x of 0.2 at 265 kV/cm obtains Wrec of 3.15 J/cm3 and η of 76.05%. 0.8NBT-0.2SBZ ceramics exhibit a superior frequency/temperature stability in energy storage performance. CD and PD of 0.8NBT-0.2SBZ ceramics are 188.54 A/cm2 and 11.31 MW/cm3 at 120 kV/cm, with an extremely fast t0.9 of 52.6 ns.
Conclusions NBT-SBZ relaxor ferroelectric ceramics were prepared via introducing SBZ to improve the relaxor ferroelectricity and energy storage properties of NBT ceramics. 0.8NBT-0.2SBZ ceramic achieved the optimum energy storage properties (i.e., Wrec=3.15 J/cm3, η=76.05%) at 265 kV/cm, as well as a superior stability of the energy storage performance at 1-100 Hz) and 20-140 ℃. The CD and PD of 0.8NBT-0.2SBZ ceramic were 188.54 A/cm2 and 11.31 MW/cm3 at 120 kV/cm, respectively, with a fast t0.9 of 52.6 ns. The 0.8NBT-0.2SBZ ceramic had a superior temperature/frequency stability, a super high power density, and extremely fast discharge time, having a great potential for application in pulse power supply equipment.
, authors=Aoyu ZHANG, Tong WANG, Jiaxiang LIU, Jiahao CHEN, Wei CHEN, Haibo YANG, authorsList=Aoyu ZHANG, Tong WANG, Jiaxiang LIU, Jiahao CHEN, Wei CHEN, Haibo YANG, authorCompany=null, correspAuthors=Tong WANG, authorNote=
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0.7Bi
0.2ZrO
3改性钛酸铋钠陶瓷的结构、介电及储能性能, columnId=1321894869514178781, journalTitle=硅酸盐学报, columnName=电介质储能材料专刊—研究论文, runingTitle=null, highlight=null, articleAbstract=
近年来随着电子元件产业的快速发展,高能量密度以及快速充放电的电容器成为新的研究热点,这对于脉冲功率电容器的储能密度及效率提出了更高的要求。通过引入Sr0.7Bi0.2ZrO3(SBZ),提高了Na0.5Bi0.5TiO3(NBT)陶瓷的储能密度和效率。SBZ的加入将Tm(最大介电常数温度)从309.03 ℃降到240.15 ℃,同时还增强了弛豫性。在265 kV·cm-1的电场强度下,样品0.8NBT-0.2SBZ陶瓷同步实现了较高的可回收能量密度(Wrec=3.15 J·cm-3)和能量效率(η=76.05%)。此外,在150 kV·cm-1的电场强度下,实现了出色的温度稳定性(20~120 ℃)和频率稳定性(1~100 Hz),以及在120 kV·cm-1下,0.8NBT-0.2SBZ陶瓷获得超大的功率密度(PD=11.31 MW·cm-3),超快的放电时间(t0.9=52.6 ns)。结果表明,0.8NBT-0.2SBZ陶瓷有望应用于宽温,宽频的大功率脉冲设备中。
, authors=张傲宇, 王通, 刘家翔, 陈佳豪, 陈伟, 杨海波, authorsList=张傲宇, 王通, 刘家翔, 陈佳豪, 陈伟, 杨海波, authorCompany=null, correspAuthors=王通, authorNote=
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王通(1985—),男,博士,副教授。
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