Article
Chemistry, Physical
N. A. Zhuk, N. A. Sekushin, M. G. Krzhizhanovskaya, V. A. Belyy, R. Korolev
Summary: Ni-doped CaCu3Ti4O12 ceramics were synthesized with different compositions and their electrical properties were studied. The samples exhibited high dielectric constant and low dielectric loss, which was attributed to the mechanism of ionic charge transfer predominating at room temperature, leading to significant values of impedance phase at low frequencies.
SOLID STATE IONICS
(2021)
Article
Chemistry, Physical
O. Z. Yanchevskii, O. V'yunov, A. G. Belous, L. L. Kovalenko
Summary: The resistances of grain boundary and interface between sample and electrode increase with the combined introduction of Al3+ and F- ions. After 12 hours of sintering, a decrease in dielectric properties was observed due to copper losses. Samples sintered for 10 hours at 1 kHz exhibit specific dielectric parameters.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Ceramics
Aditya Jain, Y. G. Wang, H. Guo
Summary: The addition of Nd in Ba0.90Ca0.10Ti0.90Zr0.10O3 lattice has resulted in optimal grain size and density among the five compositions, leading to significantly enhanced dielectric, ferroelectric, and piezoelectric characteristics. The Nd-doped sample exhibits relaxor behavior with a maximum dielectric constant of 10788 and a high saturation polarization of 41.88 mu C/cm(2). Additionally, the material shows excellent electromechanical behavior with favorable aging characteristics, suggesting its potential application in multi-layer energy storage capacitors.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Physical
Yunfei Yu, Qun Wang, Yongqing Li, Mehtab Ur Rehman, Waheed Qamar Khan
Summary: The co-doping of Sr and Zr in CCTO ceramics simultaneously increases the dielectric constant and reduces the dielectric loss. The coexistence of mixed Cu+/Cu2+ and Ti3+/Ti4+ valence states promotes dipole polarization, resulting in higher dielectric constant. The dielectric properties of the materials are analyzed using the internal barrier layer capacitance model.
Article
Chemistry, Physical
Mohamed Aissa, Moneim Zannen, Hassan A. H. Alzahrani, Jamal Belhadi, Youness Hadouch, Daoud Mezzane, Mimoun El Marssi, Mustapha Majdoub, Abdelilah Lahmar
Summary: Undoped and RE3+ (RE: Pr; Nd; Dy; Ho; Tm) doped 0.925Na(0.5)Bi(0.5)TiO(3)-0.075K(0.5)Na(0.5)NbO(3) ceramics were successfully synthesized using the solid-state synthesis method. The doped samples showed more diffused phase transition curves and higher dielectric constants. The ferroelectric hysteresis loops demonstrated a significant increase in polarization and electric breakdown strengths for the doped samples. Optical studies revealed the conversion of near-infrared light to visible light and the generation of multichromatic spectral emissions.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Kyungtaek Lee, Sugato Hajra, Manisha Sahu, Hoe Joon Kim
Summary: The research investigates a room temperature multiferroic material LaFeO3 (LFO) synthesized using mixed oxide processing and heat treatment, showing superior ferroelectric properties and excellent gas sensing performance with a colossal dielectric constant and low loss. The material displays outstanding gas sensing properties and dielectric characteristics, suggesting potential for ultra-high sensitive gas sensors based on lead-free orthoferrites perovskites.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Ceramics
T. Gecil Evangeline, A. Raja Annamalai
Summary: The colossal dielectric response of La-doped CaCu3Ti4O12 ceramics has been investigated in this study. The effects of La3+ on the microstructural and crystallographic properties have been analyzed using SEM, EDS, and XRD. The results show that La-doped samples exhibit higher dielectric constant and lower loss factor than pure CCTO.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Jakkree Boonlakhorn, Bundit Putasaeng, Pinit Kidkhunthod, Jedsada Manyam, Sriprajak Krongsuk, Pornjuk Srepusharawoot, Prasit Thongbai
Summary: By doping Sn4+, high dielectric permittivity and low loss tangent were achieved in CaCu2.95Mg0.05Ti4O12 ceramics, along with improvements in breakdown electric field and nonlinear coefficient. Reduction in the Cu+/Cu2+ ratio led to increased resistivities of grains and grain boundaries, resulting in improved nonlinear electrical properties.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Materials Science, Ceramics
Haibo Yu, Yuying Zhang, Xiaolin Zhang, Da Wang, Ruiqing Chu, Zhijun Xu
Summary: CaCu3Ti4O12-xwt%BiSbO4 ceramics were prepared by solid-state reaction method, and their microstructure, dielectric properties, varistor properties, and photoluminescence properties were studied. The results showed that doping BSO improved the grain boundary characteristics and electrical properties of the ceramics, resulting in better temperature stability and non-linear electrical characteristics. Additionally, the addition of BSO enhanced the photoluminescent emission of the ceramics, indicating potential applications in novel devices with photoluminescent/electrical multifunctional properties.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Multidisciplinary
Pu Mao, Congbin Zeng, Yongguang Guo, Gang Lu, Qingsong Yan, Zhiyong Liu, Bing Xie, Yingying Zhao, Kun Guo, Lixue Zhang
Summary: In this study, the electrical heterogeneity of CaCu3Ti4O12 (CCTO) ceramic was modulated through the introduction of nano ZnO. The CCTO-ZnO samples exhibited significantly enhanced dielectric and nonlinear properties, with a colossal dielectric constant of 104-105 at room temperature. The stability of dielectric constant in a wide frequency range and over a temperature scope was improved, and the x = 0.04 sample showed relatively lower room-temperature dielectric loss. Moreover, the breakdown field strength and nonlinear coefficient of CCTO-ZnO ceramics were improved, attributed to the tunable electrical heterogeneity according to the internal barrier layer capacitor (IBLC) model.
MATERIALS RESEARCH BULLETIN
(2023)
Article
Metallurgy & Metallurgical Engineering
Ming Jiang, Zhan Cheng, Dan Zhao, Lei Zhang, Dong Xu
Summary: In this study, Mg-doped CCTO thin films were prepared by a modified sol-gel method, and a comparative study on their microstructure and electrical properties was carried out. The results showed that Mg doping could reduce the grain size of CCTO films and improve the dielectric constant and frequency stability.
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
(2022)
Article
Chemistry, Physical
Jakkree Boonlakhorn, Narong Chanlek, Jedsada Manyam, Pornjuk Srepusharawoot, Prasit Thongbai
Summary: The dielectric permittivity of CaCu3Ti4O12 was enhanced by doping with Mg at the Cu site, and further enhanced by codoping with Ge at the Ti site. The enhancement was attributed to the increased ratio of grain size to grain boundary thickness and increased free charge inside semiconducting grains. The double-step reduction in the low-frequency loss tangent was due to the enhanced resistance of the insulating grain boundaries from the segregation of the Cu-rich phase.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Jiangpeng Zhao, Li Sun, Ensi Cao, Wentao Hao, Yongjia Zhang, Lin Ju
Summary: Strontium (Sr) doping in CaCu3Ti4O12 (CCTO) ceramics improves dielectric properties and breakdown electric field, with reduced dielectric loss. This suggests that Sr doped at the Ca2+ site enhances the applicability of CCTO and can be used in future practical research.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2022)
Article
Materials Science, Ceramics
Jakkree Boonlakhorn, Punpatsorn Suksangrat, Prasit Thongbai, Pornjuk Srepusharawoot
Summary: In this study, CaCu3Ti4O12 and CaCu2.95Zn0.05Ti4-xAlxO12 ceramics were prepared using a conventional solid-state reaction method. Co-doping with Zn2+ and Al3+ resulted in an increased grain size. The improved electrical properties of grain boundaries, possibly due to the influence of metastable phases and oxygen enrichment, contributed to the enhanced dielectric properties of the co-doped ceramics.
CERAMICS INTERNATIONAL
(2023)
Article
Polymer Science
Salam Rhouma, Adel Megriche, Emna Souidi, Senda Said, Cecile Autret-lambert
Summary: In this work, CaCu2.9Ni0.1Ti4O12 ceramics were synthesized by a semi-wet route. The CaCu2.8Ni0.2Ti4O12 ceramic showed an enhancement in breakdown electric voltage and nonlinear coefficient, as well as a decrease in dielectric loss.
JOURNAL OF INORGANIC AND ORGANOMETALLIC POLYMERS AND MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Kaiyuan Chen, Qi Zhang, Jia Liu, Jie Wang, Zhencheng Lan, Liang Fang, Changzheng Hu, Nengneng Luo, Biaolin Peng, Changbai Long, Dawei Wang, Laijun Liu
Summary: This study reveals the coexistence of re-entrant relaxor behavior and ferroelectric-paraelectric transition in complex perovskite oxide, and describes two dielectric anomalies using a phenomenological statistical model. The sizes of two types of PNRs corresponding to different ferroelectric states were determined, and the dynamics of PNRs were analyzed using isothermal electrical modulus.
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
(2022)
Article
Chemistry, Physical
Jing Shi, Xiao Liu, Fangyuan Zhu, Wenchao Tian, Yuanhua Xia, Tangyuan Li, Rongrong Rao, Tao Zhang, Laijun Liu
Summary: This study comprehensively investigates the structural characteristics and electrical performance of off-stoichiometry perovskite structural Bi0.5Na0.5TiO3 (BNT) ferroelectrics. The research reveals significant structural evolution and its influence on the ion migration ability, as well as the subtle distortions of ionic displacements, oxygen octahedral tilts, and local chemical environments for oxygen vacancies. These findings provide insights for designing BNT based oxide ion conductors with superior oxide ionic conductivity.
JOURNAL OF MATERIOMICS
(2022)
Article
Nanoscience & Nanotechnology
Yang Zhang, Nengneng Luo, Deqian Zeng, Chao Xu, Li Ma, Gengguang Luo, Yixin Qian, Qin Feng, Xiyong Chen, Changzheng Hu, Laijun Liu, Toyohisa Fujita, Yuezhou Wei
Summary: This study demonstrates that ferroelectricity and Schottky heterojunction engineering can greatly enhance the piezo-photocatalytic activity of AgNbO3, providing a promising catalyst for degrading organic contaminants.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Materials Science, Ceramics
Caige Liu, Shuangfeng Wu, Laijun Liu, Xiuyun Lei, Jungu Xu, Jibran Khaliq, Chunchun Li
Summary: A low temperature fired Na2CaV4O12 ceramic with low relative permittivity and loss tangent was synthesized via a solid-state reaction route. The research revealed a dielectric anomaly peak at high temperatures and provided insights into the electrical conduction mechanism.
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Physical
Hui Liu, Zheng Sun, Shengdong Sun, Yueyun Zhang, Huajie Luo, He Qi, Laijun Liu, Joerg C. Neuefeind, Xianran Xing, Jun Chen
Summary: This study investigates the local structure of lead-based relaxor ferroelectrics using neutron total scattering combined with reverse Monte Carlo modeling. The results reveal the existence of ordered/disordered features and forced behavior of polar vectors in the material. The study provides insights into the polarization behavior of relaxor ferroelectrics, laying a foundation for understanding their unique properties.
CHEMISTRY OF MATERIALS
(2022)
Article
Physics, Applied
Qiuwei He, Siegbert Schmid, Xue Chen, Biaolin Peng, ChunChun Li, Changzheng Hu, Laijun Liu, Manuel Hinterstein
Summary: This paper reports a novel lead-free tungsten bronze type ceramic, Sr5BiTi3Nb7O30, which exhibits second-order non-linear optical behavior and ferroelectric properties. The disorder on the A and B sites in Sr5BiTi3Nb7O30 leads to strong frequency dispersion and a low phase-transition temperature. The temperature dependence of the dielectric responses is described using a statistical model, and the calculated sizes of polar nanoregions imply a more diffuse ferroelectric transition.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Materials Science, Ceramics
Yingzhi Meng, Kang Liu, Xiuyun Zhang, Xiuyun Lei, Jun Chen, Zhao Yang, Biaolin Peng, Changbai Long, Laijun Liu, Chunchun Li
Summary: This study investigated the colossal-permittivity behavior in rare-earth doped BaTiO3 ceramics and identified the coupling of point defects as well as the effects of internal barrier layer capacitance and surface barrier layer capacitor. The study highlights the potential applications of these materials in the miniaturization of electronic components and high-energy storage.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Ceramics
Li Ma, Zhenpei Chen, Zhiyi Che, Qin Feng, Zhenyong Cen, Fujita Toyohisa, Yuezhou Wei, Changzheng Hu, Laijun Liu, Nengneng Luo
Summary: This study investigated the effects of lanthanide element dopants in the Silver niobate system, finding that ceramic materials composed of SmAN to TbAN can achieve higher energy density and efficiency, which gradually decrease with increasing atomic number.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Engineering, Electrical & Electronic
Xiao Zheng, Zuheng Jin, Yuejun Dan, Changzheng Hu, Laijun Liu, Liang Fang
Summary: Tungsten bronze ceramics were prepared using the solid-state reaction method to study the influence of La3+ concentration on the microstructure, dielectric, and ferroelectric properties of Sr4 - xNa2 - xLaxTa0.6Nb9.4O30. The introduction of La3+ promoted dipole-glass-like behavior and enhanced dielectric relaxation. Calculations and analysis of polar nanoregions (PNRs) revealed that the stability of the dielectric constant is inversely related to the size of PNRs. It is crucial to obtain small size and a high number of active PNRs, as well as a weak coupling between PNRs and other polar clusters, for energy storage performance. A high energy storage density of 2.06 J/cm(3) was achieved in Sr3.8Na1.8La0.2Ta0.6Nb9.4O30.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Chemistry, Multidisciplinary
Zheng Sun, Ji Zhang, Huajie Luo, Yonghao Yao, Na Wang, Liang Chen, Tianyu Li, Changzheng Hu, He Qi, Shiqing Deng, Leighanne C. Gallington, Yuanpeng Zhang, Joerg C. Neuefeind, Hui Liu, Jun Chen
Summary: Through local structure design, we demonstrate that a lead-free relaxor with a simple chemical composition can achieve simultaneously high energy density (Wrec) and high efficiency (eta), as well as excellent thermal and frequency stabilities. By introducing Bi with 6s2 lone pair stereochemical activity into the classical BaTiO3 ferroelectric, a relaxor state with strong local polar fluctuations can be formed, resulting in a slush-like structure with extremely small size polar clusters and minimized hysteresis at a high breakdown strength.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Z. Jin, X. Zheng, Z. Zhu, C. Hu, L. Liu, L. Fang, N. Luo, Z. Cheng
Summary: Efficient and environmentally friendly ferroelectric BSLNT ceramics were prepared and used as tribocatalysts for organic degradation. The catalytic capability was improved by enhancing the ferroelectric properties, leading to 92% RhB degradation after 2 hours. Further enhancement of the catalytic efficiency was achieved through electrical poling, reaching 96.8% degradation in 2 hours. Under the synergistic effect of illumination and friction, the degradation efficiency of RhB reached 95.2% after 30 minutes. This study demonstrates the application of highly efficient ferroelectric tribocatalysts for dye wastewater degradation, expanding the use of ferroelectric materials in catalysis.
MATERIALS TODAY CHEMISTRY
(2023)
Article
Chemistry, Physical
Xinjian Ouyang, Yuan Zhuang, Jiale Zhang, Feng Zhang, Xiao Jie, Weijia Chen, Yanxing Zhang, Laijun Liu, Dawei Wang
Summary: This study employs graph-based message-passing neural networks (MPNNs) to investigate the temperature-dependent structural phase transitions of perovskites. The well-trained MPNN models achieve a similar level of accuracy as density functional theory (DFT) calculations in terms of both energy and force, enabling the study of structural changes in perovskites.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Multidisciplinary
Min Peng, Chang Nan, Dawei Wang, Meng Cao, Liang Zhang, Laijun Liu, Chunliang Liu, Dangqi Fang, Yiqi Zhang, Yonggui Zhai, Yongdong Li
Summary: This study investigates the impact of a monolayer of graphene on the secondary electron emission (SEE) of an Ni (111) surface through theoretical calculations and experimental analysis. The results show that the redistribution of electron density at the graphene/Ni (111) interface leads to variations in the work function and probability of SEE. Experimental measurements confirm a significant decrease in the secondary electron yield (SEY) on the Ni (111) surface covered with graphene, consistent with the correlation between work function and SEY in metals.