Article
Materials Science, Ceramics
Yuechan Song, Peng Liu, Wenwen Wu, Quan Zhou
Summary: Al0.15Nb0.15Ti0.7O2 ceramics were synthesized via strong magnetic field alignment at 6 T and sintered under a nitrogen atmosphere. A ceramic prepared at 6 T by polishing it along the direction parallel to the magnetic field (parallel-6 T) with a brick-layered microstructure shows a colossal permittivity of ?r ?8.2 ? 104 and a low dielectric loss of tan ? ?0.019 at 1 kHz, with impedance spectroscopy suggesting that the colossal permittivity is attributed to internal barrier layer capacitor effects. XRD results indicate that approximately 90 % of the grains are aligned along the magnetic field with a tilt angle less than 10?. The average width and length of the grains for parallel-6 T ceramics are 4.1 ?m and 9.4 ?m. Compared to non-magnetically treated Al0.15Nb0.15Ti0.7O2 ceramics, the high grain boundary resistance (1.6 ? 108 ? cm) of the parallel-6 T ceramic can be responsible for this low dielectric loss.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Chemistry, Physical
Jiangtao Fan, Zhen Long, Haitao Zhou, Gang He, Zhanggui Hu
Summary: (Tm+Nb) co-doped TiO2 ceramics were prepared and their phase, microstructure, and dielectric properties were investigated. The ceramics with a co-doping concentration of 0.01 exhibited ultralow dielectric loss and colossal permittivity, showing excellent temperature and frequency stability in a certain range. The dielectric properties of the ceramics were influenced by several factors.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Ku Noor Dhaniah Ku Muhsen, Rozana Aina Maulat Osman, Mohd Sobri Idris
Summary: This study investigates the dielectric behavior and microstructural analysis of (Nb, La) co-doped TiO2 ceramic. The presence of secondary phase LaNbTiO6 affects the properties of the ceramic, and different materials and sintering temperatures lead to different results.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2022)
Article
Materials Science, Ceramics
Jingxuan Li, Yu Zeng, Yihang Fang, Nan Chen, Guoping Du, Aisheng Zhang
Summary: In this study, nanometer-sized rutile (La + Nb) co-doped TiO2 powders were synthesized using a sol-gel method to prepare ceramics with grain sizes less than 200 nm. The effect of co-doping concentration on microstructures and dielectric properties was investigated, with a 2% co-doping concentration showing high dielectric permittivity and low dielectric loss. The electron hopping and electron-pinned defect-dipole effect were considered as the main reasons for the excellent dielectric properties observed in the co-doped TiO2 ceramics.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Multidisciplinary
Shota Kakimoto, Yujiro Hashimoto, Taro Kuwano, Koji Kimura, Kouichi Hayashi, Manabu Hagiwara, Kazuhiko Deguchi, Hiroki Taniguchi
Summary: Co-doping of heterovalent ions to rutile-type TiO2 has been studied to design high-permittivity materials with local structure engineering. However, the role of co-dopants in permittivity enhancement is still unclear. Dielectric measurements were performed on Nb + X (X = Al, Ga, In) co-doped and Nb-doped TiO2 single crystals before and after annealing to investigate the effects of co-dopants. The results suggest that the huge permittivity observed in the as-grown samples is due to thermally excited carriers, while the post-annealed samples show recovery of the insulating property through migration of X cations into the single crystal.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Materials Science, Ceramics
Lin Zhou, Mingjia Jiang, Yaqiong Sun, Dong Yang, Jinhua Xu, Zhanhui Peng, Di Wu, Lingling Wei, Pengfei Liang, Xiaolian Chao, Zupei Yang
Summary: In this study, various (Cu0.5W0.5)xTi1-xO2 (CWTOx) ceramics were fabricated by a traditional solid reaction method, showing a high permittivity (epsilon r>104), low dielectric loss (tan delta < 0.1), and good temperature stability within a broad frequency/temperature range for CWTO0.015 ceramic, which meets the application requirement of X8R. Abnormal dielectric relaxation phenomena at low and high temperature regions were explained by interface polarization and ionization of oxygen vacancies, respectively, and the CP performance of CWTOx ceramics was predominantly influenced by the interface barrier layer capacitance effect according to complex impedance, XPS, and EPR results. This finding is expected to promote the further development and application of CP materials.
CERAMICS INTERNATIONAL
(2023)
Article
Biochemistry & Molecular Biology
Theeranuch Nachaithong, Narong Chanlek, Pairot Moontragoon, Prasit Thongbai
Summary: (Co, Nb) co-doped rutile TiO2 nanoparticles were prepared with low dopant concentrations, exhibiting high dielectric permittivity and low loss tangent. Impedance spectroscopy revealed that the ceramics are electrically heterogeneous, with interfacial polarization at internal insulating layers contributing to the low loss tangent.
Article
Engineering, Electrical & Electronic
Longhai Yang, Wenjie Gao, Jiaxing Wang, Chunxiang He, Gaili Yue, Tao Zhang
Summary: Li-doped Bi2/3Cu3Ti4O12 ceramics were successfully prepared, and the effect of Li doping on the crystal structure and dielectric properties was investigated. Li doping improved the dielectric constant and reduced the dielectric loss in the mid-frequency range. The dielectric response at different frequencies was found to originate from different regions within the ceramics.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Chemistry, Physical
Lei Wang, Xudong Liu, Mu Zhang, Xiaoguo Bi, Zhixin Ma, Jinsheng Li, Jialin Chen, Xudong Sun
Summary: (Nb0.5Ga0.5)(x)Ti1-xO2 single crystals with different doping amounts were prepared by Verneuil method. The crystals showed varying dielectric performance, with the best dielectric properties achieved at a doping amount of 0.5%. The colossal permittivity properties were attributed to EPDD polarization, and higher doping concentrations led to slight increases in dielectric loss. The results highlight the significance of TiO2 crystal materials with lower dielectric loss for the development of dielectric materials.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Jiangtao Fan, Yimeng Chen, Zhen Long, Liping Tong, Gang He, Zhanggui Hu
Summary: In this work, Tm + Ta co-doped TiO2 ceramics with ultrahigh permittivity and very low loss were prepared using a solid-state reaction method. The high dielectric constant and low dielectric loss were attributed to the electron pinned defect dipole response formed by the coupling of Ti3+ and oxygen vacancies. The impedance analysis and frequency dependent dielectric constant under a DC bias suggested that the internal barrier layer capacitance response and electrode response also contribute significantly to the dielectric constant.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Zhanhui Peng, Jitong Wang, Xiaoping Lei, Jie Zhu, Shudong Xu, Pengfei Liang, Lingling Wei, Di Wu, Juanjuan Wang, Xiaolian Chao, Zupei Yang
Summary: Al-doped CdCu3Ti4O12 ceramics were designed with a large dielectric permittivity via a solid-state synthesis process. The decrease in dielectric permittivity and increase in dielectric loss upon Al doping are strongly associated with decreased grain boundary resistance. The internal barrier layer capacitor dielectric mechanism was regarded as the origin of the colossal dielectric behaviors.
MATERIALS CHEMISTRY AND PHYSICS
(2021)
Article
Engineering, Electrical & Electronic
Salam Rhouma, Adel Megriche, Mohamed El Amrani, Senda Said, Cecile Autret-Lambert
Summary: A new ceramic sample (1-x) Ca0.9Sr0.1Cu2.9Mg0.1Ti4O12 (CSCMTO) - x SrTiO3 (STO) was proposed by combining two oxide phases. The structure and dielectric properties of CSCMTO ceramic were analyzed with the addition of the STO phase. The presence of STO and TiO2 phases at grain boundaries, along with decreased dielectric loss and improved breakdown voltage, indicated the importance of the STO phase.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Materials Science, Multidisciplinary
Yasumin Mingmuang, Narong Chanlek, Pornjuk Srepusharawoot, Prasit Thongbai
Summary: The dielectric performance of an Sn4+-isovalent/Ta5+-pentavalent doped TiO2 ceramic, SnTTO, was investigated. Sn4+ substitution caused slight changes in ε' and tan delta, while Ta5+ doping led to a significant increase in ε' with a high tan delta. The SnTTO ceramic exhibited high ε' and low tan delta values at 1 kHz and 25°C.
MATERIALS RESEARCH BULLETIN
(2022)
Article
Materials Science, Multidisciplinary
Zhentao Wang, Liang Zhang, Juan Liu, Zhi Jiang, Lei Zhang, Yongtao Jiu, Bin Tang, Dong Xu
Summary: With the continuous development of electronic technology, the application of colossal permittivity materials is becoming more and more important. In this study, (Sr1/3Sb2/3)( x )Ti1-x O2 (SSTO) colossal permittivity ceramics were successfully prepared and their properties were analyzed. The results showed that SSTO with a doping amount of 2% exhibited the best dielectric performance.
ECS JOURNAL OF SOLID STATE SCIENCE AND TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Fengchao Peng, Xin Liao, Yong Pu, Dachuan Zhu
Summary: The appropriate doping of Sb2O3 can promote grain coarsening in TiO2 varistor ceramics, but excessive doping inhibits grain growth. The sintering process oxidizes Sb3+ ions to Sb5+ ions, releasing free electrons and decreasing resistivity, leading to a continuous decline in breakdown voltage with increasing Sb2O3 doping content. The relative dielectric constant and nonlinear coefficient initially increase with Sb2O3 doping, reaching maximum values at 0.2 mol% before decreasing, but dielectric loss is negatively affected and the ratio of Sb3+/Sb5+ should be controlled for optimal performance.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Nanoscience & Nanotechnology
Yuanyuan Zhang, Qianqian Chen, Ruijuan Qi, Hao Shen, Fengrui Sui, Jing Yang, Wei Bai, Xiaodong Tang, Xuefeng Chen, Zhengqian Fu, Genshui Wang, Shujun Zhang
Summary: In this work, a high-performance multilayer heterostructure (PbZrO3/PbTiO3)n is reported, which achieves a high electric breakdown strength (2.9 MV/cm) and a maximum recoverable energy storage density of 36.4 J/cm3 through the heterostructure strategy. The competitive effects of interfacial blockage and local strain defects on the breakdown strength are revealed, showing an inflection point at n = 3. Atomic-scale characterizations shed light on the underlying microstructure mechanism of the interplay between heterointerface dislocations and decreased energy storage performance. This study demonstrates the potential of well-designed multilayers with high energy storage performance through heterostructure engineering.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Bin Zhang, Xiao-ming Chen, Zhe Pan, Peng Liu, Minmin Mao, Kaixin Song, Zhu Mao, Rong Sun, Dawei Wang, Shujun Zhang
Summary: In this study, a series of all-organic dielectric polymer composites were fabricated by blending NTCDA with PEI. These composites exhibited excellent energy storage performance at high temperatures, with high discharge energy density and efficiency. This research provides a facile and effective strategy for the design of high-temperature dielectric polymers for advanced electronic and electrical systems.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Materials Science, Ceramics
Xinya Feng, Zheyi An, Nan Zhang, Shuai Yang, Mingwen Wang, Chao Wang, Yang Li, Xuechen Liu, Fei Li
Summary: This study investigates the lattice parameter fluctuations in relaxor ferroelectric ceramics and non-relaxor ferroelectric ceramics at their respective paraelectric phase using X-ray diffraction. The results show that the lattice parameter fluctuations are much larger in relaxor ferroelectrics, indicating a significant distinction between relaxor ferroelectrics and conventional ferroelectrics in terms of atomic arrangement. Transmission electron microscopy experiments and X-ray scattering-intensity simulations reveal that the large fluctuations of lattice parameter in relaxor ferroelectrics can be attributed to the ordered-disordered arrangement of B-site cations at the nanoscale.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Lixiang Lai, Bin Li, Shuo Tian, Zhihao Zhao, Shujun Zhang, Yejing Dai
Summary: A giant unipolar electrostrain of 1.6% is achieved in Sr/Nb-doped Bi-0.5(Na0.82K0.18)(0.5)TiO3 lead-free textured piezoceramics by defect dipole design, which is comparable to or even higher than state-of-the-art lead-based piezoelectric single crystals. The enhanced electrostrain is realized through reversible electric-field-induced phase transition, grain orientation engineering, and defect dipole engineering. This research provides a general strategy for designing piezoceramics with high electrostrain.
ADVANCED MATERIALS
(2023)
Review
Materials Science, Multidisciplinary
Peter Kabakov, Taeyang Kim, Zhenxiang Cheng, Xiaoning Jiang, Shujun Zhang
Summary: Piezoelectric materials can convert electrical energy into mechanical response and combining different types of piezoelectric materials into composites can create well-rounded properties. These composites have the advantage of combining the flexibility of polymers with the high electromechanical coupling and piezoelectric coefficients of ferro-electric ceramics or single crystals, making them suitable for various applications such as medical ultrasound imaging and therapy, underwater acoustic sensing, industrial structural health monitoring, and energy harvesting.
ANNUAL REVIEW OF MATERIALS RESEARCH
(2023)
Article
Physics, Applied
Yan Lin, Qiang Zhuang, Fei Li
Summary: AgNbO3 (ANO)-based lead-free antiferroelectric ceramics with high energy storage density can be explored for pulsed power systems through structural heterogeneity achieved by doping different ions. A-site and B-site modified ANO-based ceramics were studied at the same doping amount of 50% to investigate their effect on ferroelectricity. The results show that both A/B site structural heterogeneities improved relaxor features and contributed to energy storage efficiency, with B-site modification having a more effective influence on structure, grain growth, and ferroelectricity regulation. The Ta-ANO component achieved an optimized recoverable energy storage density of 2.6 J/cc with an improved efficiency of 87.6%.
APPLIED PHYSICS LETTERS
(2023)
Article
Materials Science, Ceramics
Yizhou Xiao, Yuanbo Yang, Shuai Yang, Jinglei Li, Dan Liu, Jie Wu, Mingwen Wang, Chunchun Li, Fei Li
Summary: In this study, a special BaTiO3-0.03Mg-0.02Y-0.02CaZrO(3) ceramic with a high dielectric permittivity of 3000 and the dielectric variation below +/- 13% in the temperature range of -55-150 degrees C was designed and fabricated to meet the requirements of X8R capacitors. Grain size engineering and cation doping techniques were employed to prepare the BaTiO3-based ceramics with fine grains and improved temperature stability. MLCCs fabricated using these high-permittivity BaTiO3-based materials exhibited a high dielectric constant of 2950 and a high breakdown field (410 kV/cm), satisfying the X8R criterion.
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2023)
Article
Physics, Applied
Shuai Yang, Fenghua Tian, Chunchun Li, Mingwen Wang, Jinjing Zhang, Qingshan Zhu, Jie Wu, Jinglei Li, Xiangyu Gao, Fei Li
Summary: In this work, <001>-oriented Pb(In1/2Nb1/2)O-3-Pb(Sc1/2Nb1/2)O-3-PbTiO3 textured ceramics were fabricated by the template grain growth method. The electromechanical properties of these ceramics under different external fields were characterized and analyzed. The results showed that the dielectric constants of all textured ceramics increased with uniaxial prestress and hydrostatic pressure, but decreased with the increase of d.c. bias electric field. The textured ceramic with 3 vol. % BT templates exhibited the best stability under external fields, with less than 2% change in the electromechanical coupling factors under hydrostatic pressure increase to 100 MPa.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Multidisciplinary Sciences
Jinglei Li, Wanbo Qu, John Daniels, Haijun Wu, Linjing Liu, Jie Wu, Mingwen Wang, Stefano Checchia, Shuai Yang, Haobin Lei, Rui Lv, Yang Zhang, Danyang Wang, Xuexin Li, Xiangdong Ding, Jun Sun, Zhuo Xu, Yunfei Chang, Shujun Zhang, Fei Li
Summary: We developed a seed-passivated texturing process using Ba(Zr, Ti)O3 microplatelet templates to fabricate textured PZT ceramics. This process promotes template-induced grain growth in titanium-rich PZT layers and enables the desired composition through interlayer diffusion of zirconium and titanium. The textured PZT ceramics exhibited excellent properties, with Curie temperatures of 360 degrees C, piezoelectric coefficients d(33) of 760 picocoulombs per newton and g(33) of 100 millivolt meters per newton, and electromechanical couplings k(33) of 0.85. This study overcomes the challenge of fabricating textured rhombohedral PZT ceramics by suppressing the chemical reaction between PZT powder and titanate templates.
Article
Chemistry, Physical
Jincymol Joseph, Yumeng Du, Zhenxiang Cheng, Shujun Zhang
Summary: The fabrication of ceramic capacitors requires breakthroughs in technology to address concerns about sustainability, cost, and power consumption. A low temperature sintered xBiScO(3)-(1-x)BaTiO3 (BS-BT) with x = 0.4 has been found to have excellent energy storage performance and temperature stability. The use of this material leads to improved breakdown field and energy storage properties due to decreased grain size. This study also explores the compatibility of different electrode materials, expanding the possibilities for cost-effective production.
Article
Nanoscience & Nanotechnology
Nanxiang Jia, Ting Wang, Li Ning, Zhiqiang Ma, Yujie Dang, Chun Chun Li, Hongliang Du, Fei Li, Zhuo Xu
Summary: Researchers successfully fabricated conformal large-area single-crystal piezocomposites with high electromechanical coupling factor and piezoelectric coefficient, which can be applied for the design and fabrication of next-generation transducers.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Nanoscience & Nanotechnology
Leiyang Zhang, Ruiyi Jing, Hongliang Du, Yunyao Huang, Qingyuan Hu, Yuan Sun, Yunfei Chang, Denis Alikin, Xiaoyong Wei, Wenwu Cao, Vladimir Shur, Shujun Zhang, Dragan Damjanovic, Li Jin
Summary: This research introduces a novel approach to texture engineering in order to enhance the electrostrictive effect. The (Ba0.95Ca0.05)(Ti0.88Sn0.12)O-3 (BCTS) ceramics exhibit ultrahigh electrostrictive strain and negligible hysteresis, offering great potential for advancements in this field.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Materials Science, Ceramics
Jianguo Chen, Binghao Cui, John E. Daniels, Jianli Wang, Qinfen Gu, Ying Jiang, Zhenxiang Cheng, Jinrong Cheng, Shujun Zhang
Summary: The origins of unipolar strain, strain hysteresis, and remnant strain in Mn-modified BF-BT ceramics near the pseudo-cubic and rhombohedral (PC-R) phase boundary were investigated using high-energy synchrotron X-ray diffraction. It was found that the largest unipolar strain occurred at the composition with a single pseudo-cubic phase, due to the synergetic contributions from reversible phase transition, non-180 degrees domain switching, and lattice distortion. The phase boundary composition exhibited irreversible phase transition, with the unipolar strain attributed to lattice distortion. The lowest strain hysteresis and remnant strain were observed in BF-BT ceramics with rhombohedral phase, as reversible lattice distortion dominated the strain level.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Multidisciplinary Sciences
Wenya Du, Lin Zhang, Emma Suh, Dabin Lin, Colin Marcus, Lara Ozkan, Avani Ahuja, Sara Fernandez, Ikra Iftekhar Shuvo, David Sadat, Weiguo Liu, Fei Li, Anantha P. Chandrakasan, Tolga Ozmen, Canan Dagdeviren
Summary: Researchers developed a wearable, conformable ultrasound breast patch (cUSBr-Patch) that allows standardized and reproducible image acquisition over the entire breast, reducing reliance on operator training and transducer compression. The patch, inspired by nature's honeycomb shape and guided by a user-friendly tracker, enables large-area, deep scanning, and multiangle breast imaging. In vitro studies and clinical trials demonstrated that the piezoelectric crystal-based array (Yb/Bi-PIN-PMN-PT) exhibited sufficient contrast resolution (approximately 3 dB) and axial/lateral resolutions of 0.25/1.0 mm at a depth of 30 mm, enabling the observation of small cysts (approximately 0.3 cm) in the breast. This research introduces a novel ultrasound technology for noninvasive real-time tracking of soft tissue dynamic changes.
