Article
Chemistry, Physical
Srinivas Pattipaka, Hyunsu Choi, Yeseul Lim, Kwi-Il Park, Kyeongwoon Chung, Geon-Tae Hwang
Summary: The electric energy storage properties of relaxor ferroelectric ceramics (BNKT-BST) are enhanced via a domain engineering method. The incorporation of BST into BNKT disrupts ferroelectric order, induces the formation of highly dynamic polar nano-regions, and improves the breakdown strength. The ceramics exhibit high recoverable energy density and energy efficiency.
Article
Chemistry, Multidisciplinary
Vladimir Lucian Ene, Valentin Razvan Lupu, Claudiu Vasile Condor, Roxana Elena Patru, Luminita Mirela Hrib, Luminita Amarande, Adrian Ionut Nicoara, Lucian Pintilie, Adelina-Carmen Ianculescu
Summary: Fine-tuning of grain sizes can greatly affect the interaction between different dielectric phenomena, allowing the development of materials with tailored dielectric responses. Understanding the relationship between grain size and dielectric properties can lead to the design and optimization of materials for specific applications.
Article
Chemistry, Physical
Xiaoming Chen, Yunwen Liao
Summary: Lead-free piezoceramics of Bi-0.5(Na0.825K0.175)(0.5)TiO3 with varying concentrations of x mol% Ag2O (x = 0, 0.1, 0.3, 0.5, 0.7, 0.9 referred to as BNKT-xA) were fabricated using the solid-state technique. The addition of Ag+ contributed to the denser microstructure and preservation of morphotropic phase boundaries between R and T phases, resulting in remarkable improvements in the properties of BNKT-0.3 mol% A piezoceramics. The d(33) value of BNKT-xA ceramics shows negligible variation in the temperature range of 25 to 125 °C, indicating reliable performance over a certain operating temperature range.
Article
Materials Science, Ceramics
Li Yang, Chao Chen, Xiangping Jiang, Xiaokun Huang, Xin Nie, Saisai Chang
Summary: Lead-free piezoelectric ceramics with excellent performance were synthesized using conventional sintering methods. The impacts of Bi compensation and sintering conditions on the structure and electrical properties were studied. The simultaneous optimization of Bi compensation and sintering conditions will provide guidance for designing ceramics used in various device applications.
CERAMICS INTERNATIONAL
(2022)
Article
Engineering, Environmental
Wen Wang, Leiyang Zhang, Chao Li, D. O. Alikin, V. Ya. Shur, Xiaoyong Wei, Feng Gao, Hongliang Du, Li Jin
Summary: A collaborative optimization strategy was proposed to improve the energy storage performance of (Ba0.8Sr0.2)TiO3-based RFE ceramics by introducing Bi(Mg0.5Zr0.5)O-3 and using a viscous polymer process. The strategy resulted in exceptional energy storage parameters, including high recoverable energy density and energy efficiency, while maintaining stable temperature stability. The performance of BMZ15VPP indicates its competitiveness in advanced pulsed power capacitor systems, demonstrating the feasibility of this strategy in designing composite high energy storage ceramic systems.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Crystallography
Ya Lu, Haibo Zhang, Huabin Yang, Pengyuan Fan, Chanatip Samart, Naohisa Takesue, Hua Tan
Summary: Compared to batteries and electrochemical capacitors, dielectric capacitors are widely studied due to their advantages in terms of charging/discharging speed and power density. In this study, high-entropy (Bi0.2Na0.2Sr0.2Ba0.2Ca0.2)TiO3 lead-free relaxor-ferroelectric ceramics were prepared using both conventional sintering (CS) and spark plasma sintering (SPS). The SPS-prepared ceramics exhibited a high energy storage density of 6.66 J/cm(3) and a satisfactory energy storage efficiency of 77.2% under an electric field of 430 kV/cm, attributed to their high density, fine grains, number of oxygen vacancies, and composition uniformity. This study presents a new approach for preparing high-entropy dielectric energy storage ceramics with excellent energy storage properties.
Article
Physics, Condensed Matter
L. G. Wang, X. F. Su, C. M. Zhu, G. B. Yu, R. T. Huang
Summary: (1-x)Bi-0.5(Na0.8K0.2)(0.5)TiO3/xNaNbO3 (0<x≤0.1) ceramics were prepared via solid-state reaction. The addition of NaNbO3 resulted in slight crystal distortion and nanoscale particle size, improving the relaxor phenomenon by disrupting the original ferroelectric long-range order, thus enhancing energy storage density and efficiency. Particularly, excellent energy storage properties were observed at x=0.075 with good thermal, frequency, and cycle stability. Moreover, the highest energy storage density and efficiency were achieved at around 160 degrees Celsius with x=0.075. Additionally, the charge-discharge performance was also satisfactory. These findings suggest that designing Bi-0.5(Na0.8K0.2)(0.5)TiO3-based relaxor ferroelectrics with NaNbO3 is an effective approach to achieve excellent energy storage performance in dielectric capacitors.
SOLID STATE COMMUNICATIONS
(2023)
Article
Chemistry, Physical
Nicholas Cucciniello, Alessandro R. Mazza, Pinku Roy, Sundar Kunwar, Di Zhang, Henry Y. Feng, Katrina Arsky, Aiping Chen, Quanxi Jia
Summary: With the anticipated doubling of energy demand in the next three decades, there is a pressing need to advance the technology of energy harvesting and storage for renewable energy. This study focuses on a specific subset of dielectric materials, ferroelectrics, for energy storage. By exploring the influence of crystallographic orientation on the microstructure and properties, the research offers insights into enhancing energy storage performance.
Article
Chemistry, Physical
Seok-Mo Kang, Tae Wan Kim, Nam-Hoon Kim, Sung-Jin Kim, Jung-Hyuk Koh
Summary: The composition of lead-free piezoelectric ceramics (1 - x)(Bi0.5Na0.5)TiO3-x(Ba0.5Sr0.5)TiO3 with excellent piezoelectric properties was investigated in this study. Crystal analysis, electrical and piezoelectric properties were analyzed based on the content of BST composition. It was found that the optimal composition was 0.12 BST, which exhibited a phase change from rhombohedral to tetragonal structure, the highest permittivity, and the highest values of P-r, d(33), k(p), and Curie temperature (T-m). These results confirm that 0.12 BST is the optimal composition for (1 - x)BNT-xBST piezoelectric ceramics.
Article
Materials Science, Ceramics
Zheng Wu, Mengyuan Zhang, Xianyao Jiang, Xucheng Ke, Yu Cai, Liang Cao, Jiani Li, Huixia Jia, Chuanqing Li, Chung Ming Leung, Feifei Wang
Summary: In this study, a lead-free pyroelectric infrared (PIR) detector using (Bi1/2Na1/2TiO3)-BaTiO3(BNT-BT) ferroelectric ceramics as the sensitive material was investigated. The effects of modulation frequency on noise density, voltage response rate (R-V), and specific detection rate (D*) under the current mode amplification circuit were studied. It was found that the lead-free PIR detector exhibited high R-V in the low frequency band. The R-V and D* reached 1.51 x 10(5) V/W and 2.02 x 10(8) cmHz(1/2)W(-1) at 10 Hz, respectively. The results indicated that BNT-BT lead-free ceramics have great potential in PIR detector applications.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Multidisciplinary
Huajie Luo, He Qi, Shengdong Sun, Lu Wang, Yang Ren, Hui Liu, Shiqing Deng, Jun Chen
Summary: Achieving high piezoelectric performance in the (1-x)(Na0.5Bi0.5)TiO3-x(0.9BaTiO(3)-0.1BiAlO(3)) ternary system through crystal structure design, with the incorporation of BiAlO3 suppressing structural distortion and enabling extensive and reversible phase transformation under electric field. In-situ electric field synchrotron X-ray diffraction reveals that the crystal lattice of the R3c phase responds more flexibly to the electric field than that of the P4bm phase. Enhanced piezoelectric response is attributed to activated domain switching and lattice strain enhancement from subtle phase structure.
Article
Materials Science, Ceramics
Manish Badole, Hari Narayanan Vasavan, Samriddhi Saxena, Asish Kumar Das, Pratiksha Gami, Sunil Kumar
Summary: This study fabricated K0.5Bi0.5TiO3 ceramics with different grain morphologies and demonstrated the strong dependence of electrical properties on grain morphology. The ceramics with plate and rod-shaped grain morphologies exhibited enhanced piezoelectric performance and conductivity.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Chemistry, Physical
Muhammad Habib, Myang Hwan Lee, Da Jeong Kim, Fazli Akram, Hai In Choi, Myong-Ho Kim, Won-Jeong Kim, Tae Kwon Song
Summary: By studying three different series of lead-free ceramics, two morphotropic phase boundaries (MPBs) were discovered, revealing the relationship between piezoelectric performance and crystal structure. The significant enhancement in piezoelectric strain response due to local structural heterogeneity caused by La3+ doping serves as the basis for the improvement in ceramic performance.
JOURNAL OF MATERIOMICS
(2021)
Article
Engineering, Electrical & Electronic
Abd El-razek Mahmoud, M. Fangary, M. Nassary, O. Hemeda
Summary: A series of Pb-free ceramics were synthesized with varying compositions of ST addition, leading to changes in crystal structure and properties observed at different temperatures, indicating different domain structures and phase transitions.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Chemistry, Multidisciplinary
Zehuan Wang, Denghao Ma, Yunhan Wang, Yan Xie, Zhonghui Yu, Jin Cheng, Li Li, Liang Sun, Shuxiang Dong, Hong Wang
Summary: A design strategy inspired by Kirigami/Origami was proposed for the preparation of curved and porous piezoelectric ceramics with specific shapes. The ceramics produced using this strategy exhibit a high piezoelectric constant and are well-suited for use in the human body to detect pulse signals. This strategy provides a new approach for the large-scale and low-cost production of complex-shaped ceramics.
Article
Chemistry, Multidisciplinary
Raz Muhammad, Asif Ali, Javier Camargo, Miriam S. Castro
Article
Chemistry, Physical
J. Camargo, A. Prado Espinosa, F. Zabotto, L. Ramajo, M. Castro
JOURNAL OF ALLOYS AND COMPOUNDS
(2020)
Article
Materials Science, Ceramics
A. Prado, J. Camargo, P. Ochsner, L. Ramajo, M. Castro
JOURNAL OF ELECTROCERAMICS
(2020)
Article
Materials Science, Multidisciplinary
A. PRADO, F. RUBIO-MARCOS, L. RAMAJO, M. S. CASTRO
BULLETIN OF MATERIALS SCIENCE
(2020)
Article
Materials Science, Ceramics
A. Prado Espinosa, L. Ramajo, F. Rubio-Marcos, C. Macchi, A. Somoza, M. Castro
Summary: The study investigates the induced changes in the vacancy-like defect structure and dielectric properties of K0.5Na0.5NbO3 ceramics by adding various amounts of BaTiO3. Structural evolution was monitored using X-ray diffraction and Raman spectroscopy, with positron annihilation lifetime spectroscopy used to identify defect structures at a sub-nanometric scale. The discussion also highlights lattice symmetry changes and defects formed due to ion replacements in the KNN-based ceramics.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Materials Science, Ceramics
Mauro Difeo, Santiago Osinaga, Mariano Febbo, Sebastian P. Machado, M. Castro, Leandro Ramajo
Summary: This study reports on the harvested energy of lead-free ceramics using different geometries, showing a significant influence of morphology on the electromechanical response of the system, with rectangular plates generating higher voltages than disks.
CERAMICS INTERNATIONAL
(2021)
Article
Engineering, Electrical & Electronic
E. A. Villegas, L. A. Ramajo, M. E. Lere, M. S. Castro, R. Parra
Summary: Pure and aluminum doped-zinc oxide thin films were grown by spray-pyrolysis method on glass substrates. The addition of Al led to changes in microstructure and grain morphology of the films. Electrical response to UV light was more intense in undoped films, with longer recovery time after interrupting illumination.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2021)
Article
Engineering, Electrical & Electronic
Javier Camargo, Santiago Osinaga, Mariano Febbo, Sebastian P. Machado, Fernando Rubio-Marcos, Leandro Ramajo, Miriam Castro
Summary: In order to replace toxic lead compounds, researchers have proposed Bi-0.5(Na0.8K0.2)(0.5)TiO3 (BNKT) lead-free piezoceramics as a candidate material for energy harvesting devices. Through a systematic study of the voltage generation of BNKT-based piezoceramics, it was found that they exhibit good ferro-piezoelectric properties and potential technological applications for energy harvesting.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Physics, Applied
M. Difeo, L. Ramajo, M. Castro
Summary: The doping effects of CuO on the sintering behavior and electrical properties of lead-free piezoceramic were investigated. It was found that the addition of CuO improved the sinterability and densification, leading to enhanced piezoelectric coefficient. The CuO-doped samples sintered at 1050 degrees C exhibited the highest density values.
JOURNAL OF ADVANCED DIELECTRICS
(2021)
Article
Chemistry, Physical
Javier Camargo, Leandro Ramajo, Miriam Castro
Summary: The influence of synthesis methods on the properties of Bi-0.5(Na0.8K0.2)(0.5)TiO3-Ni0.5Co0.5Fe2O4 composites was studied. Different routes were used to synthesize each phase, and the composites were prepared with varying fractions. The properties of the composites were evaluated, and it was found that the combination of composition and synthesis routes modulated the magnetoelectric properties.
Article
Physics, Applied
Javier E. Camargo, Leandro A. Ramajo, Miriam S. Castro
Summary: Ni0.5Co0.5Fe2O4 (NCF) powders were obtained using solid-state reaction and Pechini's methods, with the former showing better magnetic properties and the latter containing a secondary phase.
JOURNAL OF ADVANCED DIELECTRICS
(2021)
Article
Physics, Applied
J. A. Cortes, J. Camargo, M. F. Rachia, F. Rubio-Marcos, L. Ramajo, M. Castro, M. A. Ramirez
Summary: The impact of sintering conditions on the structure, microstructure, and ferroelectric properties of (K0.44Na0.52Li0.04)(Nb0.86Ta0.10Sb0.04)-O-3 (KNL-NTS) was studied. The ceramics sintered at 1125 degrees Celsius showed the highest piezoelectric performance among the different temperature treatments.
JOURNAL OF ADVANCED DIELECTRICS
(2021)
