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Journal articles on the topic 'Lead Free Sodium Bismuth Titanate'

Author: Grafiati
Published: 4 June 2021
Last updated: 7 September 2023

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1

Gomah-Pettry, J. "Sodium-bismuth titanate based lead-free ferroelectric materials." Journal of the European Ceramic Society 24, no. 6 (2004): 1165–69. http://dx.doi.org/10.1016/s0955-2219(03)00473-4.

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2

Muanghlua, Rangson, Surasak Niemcharoen, Wanwilai C. Vittayakorn, Nattapong Tungsitvisetkul, Pimjan Chinwaro, Anucha Ruangphanit, Nopsiri Chaiyo, and Naratip Vittayakorn. "Preparation and Properties of Lead Free Bismuth Sodium Titanate−Bismuth Zinc Titanate Ceramics." Ferroelectrics 383, no. 1 (June 30, 2009): 1–7. http://dx.doi.org/10.1080/00150190902873303.

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3

Thongtha, Atthakorn, and Theerachai Bongkarn. "Combustion technique synthesis of lead-free piezoelectric bismuth sodium titanate-bismuth potassium titanate–barium titanate ceramics." Integrated Ferroelectrics 175, no. 1 (August 12, 2016): 102–10. http://dx.doi.org/10.1080/10584587.2016.1202703.

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4

Zhou, Wanfeng, and Baojin Chu. "Sodium bismuth titanate-based lead-free RAINBOW piezoelectric devices." Journal of the European Ceramic Society 37, no. 6 (June 2017): 2373–77. http://dx.doi.org/10.1016/j.jeurceramsoc.2017.01.022.

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5

Zhao, Wei, He Ping Zhou, Yong Ke Yan, and Dan Liu. "Morphotropic Phase Boundary Study of the BNT-BKT Lead-Free Piezoelectric Ceramics." Key Engineering Materials 368-372 (February 2008): 1908–10. http://dx.doi.org/10.4028/www.scientific.net/kem.368-372.1908.

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A lead-free piezoelectric ceramic binary system based on bismuth sodium titanate (Bi0.5Na0.5)TiO3 (BNT)-bismuth potassium titanate (Bi0.5K0.5)TiO3 (BKT) was synthesized by conventional mixed-oxide technique. The XRD analysis showed that the rhombohedral-tetragonal morphotropic phase boundary (MPB) of the Bi0.5 (Na1-xKx)0.5 TiO3 system was in the composition range of x = 0.16 ~ 0.20. In addition, the piezoelectric properties of this system were also investigated. It was indicated that the piezoelectric properties are better with the compositions near the rhombohedral phase within the MPB than the compositions near the tetragonal phase.
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6

Jain Ruth, D. E., M. Muneeswaran, N. V. Giridharan, and B. Sundarakannan. "Structural and electrical properties of bismuth magnesium titanate substituted lead-free sodium bismuth titanate ceramics." Journal of Materials Science: Materials in Electronics 27, no. 7 (March 15, 2016): 7018–23. http://dx.doi.org/10.1007/s10854-016-4658-3.

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7

Politova, E. D., G. M. Kaleva, A. V. Mosunov, S. Yu Stefanovich, N. V. Sadovskaya, and V. V. Shvartsman. "Characterization of modified lead-free ferroelectric sodium-bismuth titanate ceramics." Ferroelectrics 591, no. 1 (April 26, 2022): 91–99. http://dx.doi.org/10.1080/00150193.2022.2044681.

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8

Bai, Wangfeng, Xinyu Zhao, Yanwei Huang, Yuqin Ding, Leijie Wang, Peng Zheng, Peng Li, and Jiwei Zhai. "Integrating chemical engineering and crystallographic texturing design strategy for the realization of practically viable lead-free sodium bismuth titanate-based incipient piezoceramics." Dalton Transactions 49, no. 25 (2020): 8661–71. http://dx.doi.org/10.1039/d0dt01334j.

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Realization of practically viable lead-free sodium bismuth titanate-based incipient piezoceramics via the integration of chemical engineering and crystallographic texturing design strategies for high-efficiency actuator applications.
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9

Potong, Ruamporn, Rattiyakorn Rianyoi, Athipong Ngamjarurojana, and Arnon Chaipanich. "Influence of BNBK Particle Size on Properties of 0-3 Lead-Free BNBK Ceramic-Portland Cement Composites." Applied Mechanics and Materials 866 (June 2017): 183–86. http://dx.doi.org/10.4028/www.scientific.net/amm.866.183.

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The 0-3 lead-free bismuth sodium titanate-bismuth potassium titanate-barium titanate (BNBK) ceramic/Portland cement composites (PC) were fabricated by pressing and curing method. The influence of BNBK particle size on the dielectric and acoustic properties of 0-3 BNBK-PC composites was studied. BNBK of various median particle sizes (75, 212 and 425 μm) at 50% by volume were mixed with Portland cement to produce the 0-3 BNBK-PC composites. The dielectric constant results of composites were found to increase with increasing BNBK particle size and the dielectric constant of composite with 425 μm particle size at 1 kHz was 196. The 0-3 BNBK-PC composites in the range tested have an acoustic impedance match with concrete structure.
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10

LU, YI-QING, and YONG-XIANG LI. "A REVIEW ON LEAD-FREE PIEZOELECTRIC CERAMICS STUDIES IN CHINA." Journal of Advanced Dielectrics 01, no. 03 (July 2011): 269–88. http://dx.doi.org/10.1142/s2010135x11000409.

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There are a large number of research publications on the hot topic of environmental friendly lead-free piezoelectric materials worldwide in the last decade. The number of researchers and institutions involved from China is much larger than other countries or regions. The publications by Chinese researchers cover a broad spectrum on the preparations, structures, properties and applications of lead-free piezoelectric ceramics. This has motivated us to come out with a review on recent advances in development of lead-free piezoelectric ceramics in China. The emphases are especially on the preparation and electric properties of barium titanate-based materials, bismuth sodium titanate and related materials, alkaline niobate and related materials, bismuth layer-structured materials, as well as texture engineering of ceramics and some of their single crystals. Hopefully, this could give further impetus to the researchers to continue their efforts in this promising area and also draw the attentions from legislature, research office, industrial and publics.
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11

Zhou, Dongxiang, Hui Li, Shuping Gong, Yunxiang Hu, and Ke Han. "Sodium Bismuth Titanate-Based Lead-Free Piezoceramics Prepared by Aqueous Gelcasting." Journal of the American Ceramic Society 91, no. 9 (September 2008): 2792–96. http://dx.doi.org/10.1111/j.1551-2916.2008.02511.x.

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12

Guo, Kun, Shuting Chen, Chee Kiang Ivan Tan, Meysam Sharifzadeh Mirshekarloo, Kui Yao, and Francis Eng Hock Tay. "Bismuth sodium titanate lead-free piezoelectric coatings by thermal spray process." Journal of the American Ceramic Society 100, no. 8 (April 21, 2017): 3385–92. http://dx.doi.org/10.1111/jace.14882.

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13

Aravinth, K., G. Anandha Babu, and P. Ramasamy. "Flux growth and characterization of lead-free Sodium Bismuth Titanate–Barium Titanate single crystals." Journal of Crystal Growth 401 (September 2014): 787–90. http://dx.doi.org/10.1016/j.jcrysgro.2013.12.034.

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14

Kong, Yuxia, Xin Li, Zhengxiang Li, and Jigong Hao. "Temperature independent fatigue-free behavior in sodium bismuth titanate-based lead-free ceramics." Scripta Materialia 194 (March 2021): 113678. http://dx.doi.org/10.1016/j.scriptamat.2020.113678.

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15

Taghaddos, Elaheh, Mehdi Hejazi, and Ahmad Safari. "Lead-free piezoelectric materials and ultrasonic transducers for medical imaging." Journal of Advanced Dielectrics 05, no. 02 (June 2015): 1530002. http://dx.doi.org/10.1142/s2010135x15300029.

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Piezoelectric materials have been vastly used in ultrasonic transducers for medical imaging. In this paper, firstly, the most promising lead-free compositions with perovskite structure for medical imaging applications have been reviewed. The electromechanical properties of various lead-free ceramics, composites, and single crystals based on barium titanate, bismuth sodium titanate, potassium sodium niobate, and lithium niobate are presented. Then, fundamental principles and design considerations of ultrasonic transducers are briefly described. Finally, recent developments in lead-free ultrasonic probes are discussed and their acoustic performance is compared to lead-based transducers. Focused transducers with different beam focusing methods such as lens focusing and mechanical shaping are explained. Additionally, acoustic characteristics of lead-free probes including the pulse-echo results as well as their imaging capabilities for various applications such as phantom imaging, in vitro intravascular ultrasound imaging of swine aorta, and in vivo or ex vivo imaging of human eyes and skin are reviewed.
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16

Tokay, Onat, and Murat Yazıcı. "A review of potassium sodium niobate and bismuth sodium titanate based lead free piezoceramics." Materials Today Communications 31 (June 2022): 103358. http://dx.doi.org/10.1016/j.mtcomm.2022.103358.

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17

Hiruma, Yuji, Kazushige Yoshii, Rintaro Aoyagi, Hajime Nagata, and Tadashi Takenaka. "Piezoelectric Properties and Depolarization Temperatures of (Bi1/2Na1/2)TiO3-(Bi1/2K1/2)TiO3-BaTiO3 Lead-Free Piezoelectric Ceramics." Key Engineering Materials 320 (September 2006): 23–26. http://dx.doi.org/10.4028/www.scientific.net/kem.320.23.

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The piezoelectric properties of a solid solution based on the three components of bismuth sodium titanate, (Bi1/2Na1/2)TiO3 (BNT), bismuth potassium titanate, (Bi1/2K1/2)TiO3 (BKT), and barium titanate, BaTiO3 (BT), that is, x(Bi1/2Na1/2)TiO3-y(Bi1/2K1/2)TiO3-zBaTiO3 [BNBKy:z(x); x+y+z=1] are investigated. Fine piezoelectric properties in lead-free piezoelectric ceramics were obtained near the MPB composition, and the highest electromechanical coupling factors, k33 and kp, and piezoelectric constant, d33, were 0.58 and 0.36 for BNBK2:1(0.89) and 181 pC/N for BNBK2:1(0.88), respectively. In this study, we also measured the depolarization temperature, Td, from the temperature dependence of dielectric and piezoelectric properties.
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18

Zhou, Xuefan, Guoliang Xue, Hang Luo, Chris R. Bowen, and Dou Zhang. "Phase structure and properties of sodium bismuth titanate lead-free piezoelectric ceramics." Progress in Materials Science 122 (October 2021): 100836. http://dx.doi.org/10.1016/j.pmatsci.2021.100836.

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19

Zhao, Jinyan, Wei Ren, Gang Niu, Nan Zhang, Guohua Dong, Lingyan Wang, Ming Liu, Peng Shi, and Zuo-Guang Ye. "Recoverable Self-Polarization in Lead-Free Bismuth Sodium Titanate Piezoelectric Thin Films." ACS Applied Materials & Interfaces 9, no. 34 (August 15, 2017): 28716–25. http://dx.doi.org/10.1021/acsami.7b04033.

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20

Raghavender, M., G. S. Kumar, and G. Prasad. "A-site substitution-controlled dielectric dispersion in lead-free sodium bismuth titanate." Pramana 72, no. 6 (June 2009): 999–1009. http://dx.doi.org/10.1007/s12043-009-0092-x.

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21

Liu, Xing, Bo Shen, and Jiwei Zhai. "Designing novel sodium bismuth titanate lead‐free incipient perovskite for piezoactuator applications." Journal of the American Ceramic Society 102, no. 11 (May 17, 2019): 6751–59. http://dx.doi.org/10.1111/jace.16533.

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22

Cheng, Cheng, Zhuo Han, Yuzhe Liu, Junye Cheng, Junhe Yang, Xianying Wang, and Guangping Zheng. "Controllable synthesis and growth mechanism of lead free bismuth sodium titanate nanowires." Ceramics International 43, no. 15 (October 2017): 11580–87. http://dx.doi.org/10.1016/j.ceramint.2017.05.115.

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23

Chan, H. L. W., S. H. Choy, C. P. Chong, H. L. Li, and P. C. K. Liu. "Bismuth sodium titanate based lead-free ultrasonic transducer for microelectronics wirebonding applications." Ceramics International 34, no. 4 (May 2008): 773–77. http://dx.doi.org/10.1016/j.ceramint.2007.09.085.

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24

Gorfman, S., and P. A. Thomas. "Evidence for a non-rhombohedral average structure in the lead-free piezoelectric material Na0.5Bi0.5TiO3." Journal of Applied Crystallography 43, no. 6 (October 1, 2010): 1409–14. http://dx.doi.org/10.1107/s002188981003342x.

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The potential lead-free piezoelectric material sodium bismuth titanate, Na0.5Bi0.5TiO3, was investigated by means of high-resolution single-crystal X-ray diffractometry. The splitting of Bragg peaks observed in the high-resolution reciprocal-space maps suggests that the average structure of Na0.5Bi0.5TiO3has lower than rhombohedral symmetry. This observation is contrary to the commonly adopted model, which has followed from many previous analyses of neutron and X-ray powder diffraction data.
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25

Pang, Qianyi, Lanruo Han, and Xiang Yu. "Doping modification in lead-free piezoelectric ceramics." Highlights in Science, Engineering and Technology 55 (July 9, 2023): 166–75. http://dx.doi.org/10.54097/hset.v55i.9952.

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Piezoelectric ceramics are functional information ceramic materials that can convert mechanical and electrical energy into each other. They are widely used in high-tech fields, such as the electronics industry, machinery, and aerospace. Currently, Pb(ZrTi)O3 (PZT) piezoelectric materials are most commonly used, but the main component, PbO, is toxic and volatile during production and manufacturing, thus causing certain damage to human health and the environment. Therefore, research on green and environmentally friendly lead-free piezoelectric materials has been attracting much attention. This paper will therefore present two lead-free piezoelectric ceramics that have the potential to replace PZT-based lead-containing piezoelectric materials: Potassium Sodium Niobate (KNN)-based piezoelectric ceramics and Bismuth Sodium Titanate (BNT)-based lead-free piezoelectric ceramics. The piezoelectric constants of lead-free piezoelectric ceramics represented by systems such as KNN and BNT are now comparable to those of lead-containing piezoelectric ceramics and are gradually replacing traditional lead-based piezoelectric ceramics in fields such as ultrasonic atomization and hydroacoustic energy transfer.
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26

Pengpat, K., S. Hanphimol, S. Eitssayeam, U. Intatha, G. Rujijanagul, and T. Tunkasiri. "Morphotropic phase boundary and electrical properties of lead-free bismuth sodium lanthanum titanate—barium titanate ceramics." Journal of Electroceramics 16, no. 4 (July 2006): 301–5. http://dx.doi.org/10.1007/s10832-006-9869-1.

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27

Wang, Dawei, Ge Wang, Shunsuke Murakami, Zhongming Fan, Antonio Feteira, Di Zhou, Shikuan Sun, Quanliang Zhao, and Ian M. Reaney. "BiFeO3-BaTiO3: A new generation of lead-free electroceramics." Journal of Advanced Dielectrics 08, no. 06 (December 2018): 1830004. http://dx.doi.org/10.1142/s2010135x18300049.

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Lead-based electroceramics such as Pb(Zr.Ti)O3 (PZT) and its derivatives have excellent piezoelectric, pyroelectric and energy storage properties and can be used in a wide range of applications. Potential lead-free replacements for PZT such as potassium sodium niobate (KNN) and sodium bismuth titanate (NBT) have a much more limited range of useful properties and have been optimized primarily for piezoelectric applications. Here, we review the initial results on a new generation of lead-free electroceramics based on BiFeO3-BaTiO3 (BF-BT) highlighting the essential crystal chemistry that permits a wide range of functional properties. We demonstrate that with the appropriate dopants and heat treatment, BF-BT can be used to fabricate commercially viable ceramics for applications, ranging from sensors, multilayer actuators, capacitors and high-density energy storage devices. We also assess the potential of BF-BT-based ceramics for electrocaloric and pyroelectric applications.
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28

Cheng, Renfei, Lunan Zhu, Yalong Zhu, Zhijun Xu, Ruiqing Chu, Huaiyong Li, Jigong Hao, Juan Du, and Guorong Li. "Giant piezoelectricity and ultrahigh strain response in bismuth sodium titanate lead-free ceramics." Materials Letters 165 (February 2016): 143–46. http://dx.doi.org/10.1016/j.matlet.2015.11.131.

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29

Zhang, Yong, Xiaofang Liu, Ge Wang, Yang Li, Shujun Zhang, Dawei Wang, and Huajun Sun. "Enhanced mechanical energy harvesting capability in sodium bismuth titanate based lead-free piezoelectric." Journal of Alloys and Compounds 825 (June 2020): 154020. http://dx.doi.org/10.1016/j.jallcom.2020.154020.

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30

Reichmann, Klaus, Marco Deluca, Denis Schütz, and Peter Supancic. "Load Characteristics of Lead-Free Ceramic Multilayer Actuators Based on Bismuth-Sodium-Titanate." International Journal of Applied Ceramic Technology 11, no. 3 (January 21, 2014): 431–35. http://dx.doi.org/10.1111/ijac.12220.

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31

Kang, Dong Heon, and Yong Hee Kang. "Dielectric and Pyroelectric Properties of Lead-Free Sodium Bismuth Titanate Thin Films Due to Excess Sodium and Bismuth Addition." Journal of the Microelectronics and Packaging Society 20, no. 4 (December 30, 2013): 25–30. http://dx.doi.org/10.6117/kmeps.2013.20.4.025.

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32

Tian, Hu Yong, Wan Ping Chen, D. Y. Wang, Y. Wang, J. T. Zeng, and Helen Lai Wah Chan. "Preparation and Properties of Bi0.5Na0.5TiO3-Ba (Hf,Ti)TiO3 Lead-Free Piezoelectric Ceramics." Key Engineering Materials 334-335 (March 2007): 957–60. http://dx.doi.org/10.4028/www.scientific.net/kem.334-335.957.

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Lead-free piezoelectric ceramics based on bismuth sodium titanate (BNT) -barium hafnate titanate (BHT) were prepared by a two-step synthesis process. The final BNT-BHT ceramics sintered at 1180oC for 2 h in air showed a perovskite structure with high density. The morphotropic phase boundaries (MPB) were found in BNT based piezoelectric ceramics with 8~10 wt% BHT in composites. In the case of Bi0.5Na0.5TiO3-0.08BaHf0.05Ti0.95O3 ceramics, a maximum piezoelectric coefficient d33 of 122.6 pC/N was obtained. The remnant polarization (Pr) and coercive field (Ec) were measured and the relationship between ferroelectricity and the BHT fraction in the compounds was investigated. The BNT-BHT ceramics were expected to be a new and promising candidate for lead-free piezoelectric device applications.
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33

Thongtha, Atthakorn, and Theerachai Bongkarn. "Optimum Sintering Temperature for Fabrication of 0.8Bi0.5Na0.5TiO3-0.2Bi0.5K0.5TiO3 Lead-Free Ceramics by Combustion Technique." Key Engineering Materials 474-476 (April 2011): 1754–59. http://dx.doi.org/10.4028/www.scientific.net/kem.474-476.1754.

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The effect of sintering temperatures (1050-1200 °C) on the phase formation, microstructure and dielectric properties of a binary system lead-free ceramic bismuth sodium titanate–bismuth potassium titanate were investigated. 0.8Bi0.5Na0.5TiO3-0.2Bi0.5K0.5TiO3; BNKT ceramics were successfully fabricated using the combustion technique. XRD results showed the rhombohedral-tetragonal morphotropic phase boundary (MPB). The SEM results showed the average grain size (0.51-2.59 µm) of the samples increased with the increase of sintering temperatures. The sample sintered at the optimum temperature of 1150 °C exhibited the maximum density, shrinkage, dielectric constant at Curie temperature and remanent polarization (Pr) which were around 5.65 g/cm3, 17.75%, 5014 and 1.6 mC/cm2, respectively. The dielectric constant was related to the XRD results and density of the sintered ceramic.
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34

Kuanar, B. L., H. S. Mohanty, B. Dalai, and D. Behera. "Structural and electrical properties of bismuth sodium titanate ceramic." IOP Conference Series: Materials Science and Engineering 1258, no. 1 (October 1, 2022): 012007. http://dx.doi.org/10.1088/1757-899x/1258/1/012007.

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Single-phase lead-free Bi0.5Na0.5TiO3 (BNT) perovskite ferroelectric ceramic was produced using a solid-state reaction method. A detailed investigation of the structural and electrical properties of BNT ceramic is conferred. According to phase analysis employing Rietveld refined X-Ray diffraction, the crystal structure is single phase with rhombohedral (R3C) symmetry. Raman spectra measurement also confirms the rhombohedral structure of BNT by originating numerous peaks from the TiO6 octahedron. The ferroelectric character of the BNT sample was established by a hysteresis loop measurement of polarisation vs electric field (P-E). The remnant polarisation (Pr) and coercive field (Ec) have characteristic values of 1.63 μC/cm2 and 29.91 kV/cm, respectively. The ferroelectric phase change is seen in the temperature-dependent dielectric research, with a transition temperature of 323°C. The compound possessed a low value of tanδ even at a high temperature (500°C) at 1 MHz. The prepared sample exhibited excellent dielectric characteristics from room temperature to high temperatures, making it ideal for various applications.
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35

Saenkam, Kamonporn, Pharatree Jaita, Somnuk Sirisoonthorn, Tawee Tunkasiri, and Gobwute Rujijangul. "Effects of processing parameter on energy storage density and ferroelectric properties of lead-free bismuth sodium titanate-strontium bismuth titanate ceramics." ScienceAsia 47S, no. 1 (2021): 34. http://dx.doi.org/10.2306/scienceasia1513-1874.2021.s005.

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36

SHARMA, DHANANJAY K., RAJU KUMAR, RADHESHYAM RAI, SEEMA SHARMA, and ANDREI L. KHOLKIN. "IMPEDANCE AND MODULUS SPECTROSCOPY CHARACTERIZATION OF SODIUM-BISMUTH TITANATE-BASED LEAD-FREE FERROELECTRIC MATERIALS." Journal of Advanced Dielectrics 02, no. 01 (January 2012): 1250002. http://dx.doi.org/10.1142/s2010135x12500026.

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In this paper, we present impedance spectroscopy of Sodium Bismuth Titanate-based materials belonging to (1-x) Na 1/2 Bi 1/2 TiO 3-x BaTiO 3(x = 0.04) (NBT–BT) system. NBT–BT ceramics are prepared by high temperature solid-state reaction method. X-ray diffraction technique showed single-phase polycrystalline sample with an ABO3 perovskite structure. Dielectric behavior and the impedance relaxation were investigated in a wide range of temperature (room temperature (RT) –500°C) and frequency (1 kHz–1 MHz). A broad dielectric constant peak was observed over a wide temperature range around the phase transition temperature. The complex impedance plot exhibited one impedance semicircle identified over the frequency range of 1 kHz–1 MHz, which is explained by the grain effect of the bulk. The centers of the impedance semicircles lie below the real axis, which indicates that the impedance response is a Cole–Cole type relaxation.
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37

Li, Xiaowei, Xihong Hao, Shengli An, Yong Li, and Qiwei Zhang. "Enhanced energy storage in Sn-doped sodium bismuth titanate lead-free relaxor ferroelectric ceramics." Journal of Materials Science: Materials in Electronics 33, no. 8 (February 5, 2022): 5265–72. http://dx.doi.org/10.1007/s10854-022-07714-y.

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38

Royles, A. J., A. J. Bell, A. P. Jephcoat, A. K. Kleppe, S. J. Milne, and T. P. Comyn. "Electric-field-induced phase switching in the lead free piezoelectric potassium sodium bismuth titanate." Applied Physics Letters 97, no. 13 (September 27, 2010): 132909. http://dx.doi.org/10.1063/1.3490235.

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39

Camargo, J., A. Prado Espinosa, F. Zabotto, L. Ramajo, and M. Castro. "Magnetoelectric interactions in bismuth sodium-potassium titanate-nickel cobalt ferrite lead-free composite ceramics." Journal of Alloys and Compounds 826 (June 2020): 154129. http://dx.doi.org/10.1016/j.jallcom.2020.154129.

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40

Pengpat, K., P. Jarupoom, P. Kantha, S. Eitssayeam, U. Intatha, G. Rujijanagul, and T. Tunkasiri. "Phase formation and electrical properties of lead-free bismuth sodium titanate–potassium niobate ceramics." Current Applied Physics 8, no. 3-4 (May 2008): 241–45. http://dx.doi.org/10.1016/j.cap.2007.10.077.

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41

Jain Ruth, D. E., and B. Sundarakannan. "Structural and Raman spectroscopic studies of poled lead-free piezoelectric sodium bismuth titanate ceramics." Ceramics International 42, no. 4 (March 2016): 4775–78. http://dx.doi.org/10.1016/j.ceramint.2015.11.162.

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42

Politova, E. D., G. M. Kaleva, S. A. Ivanov, A. V. Mosunov, S. Yu Stefanovich, N. V. Sadovskaya, and V. V. Shvartsman. "Dielectric properties and crystallite size distribution of modified lead-free sodium-bismuth titanate ceramics." Ferroelectrics 605, no. 1 (March 12, 2023): 73–82. http://dx.doi.org/10.1080/00150193.2023.2169012.

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43

Kruae-In, Chatchai, Paponsan Puanpia, Orawan Takhan, and Suchittra Inthong. "Phase Formation, Microstructures and Mechanical Properties of Lead-Free BNKT Ferroelectric Ceramics Doped with BZZ." Key Engineering Materials 675-676 (January 2016): 589–92. http://dx.doi.org/10.4028/www.scientific.net/kem.675-676.589.

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In this research, the effects of bismuth zinc zirconate (BZZ) additive on phase formation, microstructural and mechanical properties of bismuth sodium potassium titanate (BNKT) ceramics were investigated. The BZZ-doped BNKT ceramics were prepared using solid state reaction technique. The pure phase of BZZ-doped BNKT powders were achieved for a calcinations temperature of 850 °C for 4h. The obtained powders were pressed into small pellets and sintered at optimum temperature to from dense ceramics. The XRD analysis of the ceramics shows that all ceramic samples exhibited a pure phase perovskite structure. The bulk densities of samples were about 5.82-6.03 g/cm3 which measured using the Archimedes method. The mechanical properties were measured using micro hardness tester. The microstructural of sintered surface was investigated using scanning electron microscopy (SEM). Average grain size increased with increasing BZZ content. The relations of these results were discussed and compared to the previous works.
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44

Zeroual, S., H. Lidjici, W. Chatta, and H. Khemakhem. "Dielectric and Raman spectroscopy studies of (Na0.5Bi0.5)TiO3 lead-free ceramic." Cerâmica 65, no. 374 (June 2019): 222–26. http://dx.doi.org/10.1590/0366-69132019653742627.

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Abstract In this study, samples of sodium bismuth titanate (Na0.5Bi0.5)TiO3 (NBT) have been prepared using the solid-state technique. Sintering was done at 1200 ºC for 4 h in air atmosphere. X-ray diffraction analysis carried out at room temperature showed the formation of a single-phase compound with a rhombohedral crystal system. Dielectric and Raman spectroscopic characterizations have been performed as a function of temperature. The dielectric study showed the existence of a diffuse phase transition around 330 ºC. The Raman spectra was fitted to the individual Raman peaks. The obtained peaks were analyzed by observing the changes in their respective peak positions and intensities with increasing of temperature. At high temperatures, the results showed discontinuous changes in the phonon frequencies across the rhombohedral-tetragonal transition.
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45

Manotham, Supalak, Pichitchai Butnoi, and Gobwute Rujijanagul. "Electrical and mechanical properties of bismuth sodium potassium titanate doped with a modified barium titanate lead-free ceramics." Ferroelectrics 552, no. 1 (November 18, 2019): 23–31. http://dx.doi.org/10.1080/00150193.2019.1653079.

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46

Cernea, Marin, Roxana Radu, Harvey Amorín, Simona Gabriela Greculeasa, Bogdan Stefan Vasile, Vasile Adrian Surdu, Paul Ganea, Roxana Trusca, Marwa Hattab, and Carmen Galassi. "Lead-Free BNT–BT0.08/CoFe2O4 Core–Shell Nanostructures with Potential Multifunctional Applications." Nanomaterials 10, no. 4 (April 3, 2020): 672. http://dx.doi.org/10.3390/nano10040672.

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Herein we report on novel multiferroic core–shell nanostructures of cobalt ferrite (CoFe2O4)–bismuth, sodium titanate doped with barium titanate (BNT–BT0.08), prepared by a two–step wet chemical procedure, using the sol–gel technique. The fraction of CoFe2O4 was varied from 1:0.5 to 1:1.5 = BNT–BT0.08/CoFe2O4 (molar ratio). X–ray diffraction confirmed the presence of both the spinel CoFe2O4 and the perovskite Bi0.5Na0.5TiO3 phases. Scanning electron microscopy analysis indicated that the diameter of the core–shell nanoparticles was between 15 and 40 nm. Transmission electron microscopy data showed two–phase composite nanostructures consisting of a BNT–BT0.08 core surrounded by a CoFe2O4 shell with an average thickness of 4–7 nm. Cole-Cole plots reveal the presence of grains and grain boundary effects in the BNT–BT0.08/CoFe2O4 composite. Moreover, the values of the dc conductivity were found to increase with the amount of CoFe2O4 semiconductive phase. Both X-ray photoelectron spectroscopy (XPS) and Mössbauer measurements have shown no change in the valence of the Fe3+, Co2+, Bi3+ and Ti4+ cations. This study provides a detailed insight into the magnetoelectric coupling of the multiferroic BNT–BT0.08/CoFe2O4 core–shell composite potentially suitable for magnetoelectric applications.
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47

RAMANA, M. VENKATA, S. ROOPAS KIRAN, N. RAMAMANOHAR REDDY, K. V. SIVA KUMAR, V. R. K. MURTHY, and B. S. MURTY. "SYNTHESIS OF LEAD FREE SODIUM BISMUTH TITANATE (NBT) CERAMIC BY CONVENTIONAL AND MICROWAVE SINTERING METHODS." Journal of Advanced Dielectrics 01, no. 01 (January 2011): 71–77. http://dx.doi.org/10.1142/s2010135x11000094.

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Dielectric studies were carried out on a lead free Sodium Bismuth Titanate, NBT, ( Na 0.5 Bi 0.5 TiO 3) composition. The material was synthesized by conventional ceramic method (CS) and microwave sintering (MS). The presence of single phase has been confirmed by X-ray diffraction and scanning electron microscopy of NBT ceramic. The later technique (MS) resulted in material with high density, dielectric properties and improved microstructure. The transition temperature was observed slightly higher for microwave sintered (MS) material. Longitudinal modulus measurements are very sensitive property to identify the phase transitions in ceramics. Longitudinal modulus (L) measurements were also employed on these samples in the frequency 136 kHz and can be studied in the wide temperature range 30°C to 400°C. The elastic behavior (L) showed a break at two temperatures (~200°C and 350°C) in both the conventional and microwave sintered ceramics. In NBT ceramics, permittivity anomalies are connected to modulus anomalies. The results are correlated with the dielectric measurements. This behavior explained in the light of structural phase transitions in the ferroelectric ceramics.
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48

Lee, Kai-Yang, Xi Shi, Nitish Kumar, Mark Hoffman, Martin Etter, Stefano Checchia, Jens Winter, Lucas Lemos da Silva, Daniela Seifert, and Manuel Hinterstein. "Electric-Field-Induced Phase Transformation and Frequency-Dependent Behavior of Bismuth Sodium Titanate–Barium Titanate." Materials 13, no. 5 (February 27, 2020): 1054. http://dx.doi.org/10.3390/ma13051054.

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The electric field response of the lead-free solid solution (1−x)Bi0.53Na0.47TiO3–xBaTiO3 (BNT–BT) in the higher BT composition range with x = 0.12 was investigated using in situ synchrotron X-ray powder diffraction. An introduced Bi-excess non-stoichiometry caused an extended morphotropic phase boundary, leading to an unexpected fully reversible relaxor to ferroelectric (R–FE) phase transformation behavior. By varying the field frequency in a broad range from 10−4 up to 102 Hz, BNT–12BT showed a frequency-dependent gradual suppression of the field induced ferroelectric phase transformation in favor of the relaxor state. A frequency triggered self-heating within the sample was found and the temperature increase exponentially correlated with the field frequency. The effects of a lowered phase transformation temperature TR–FE, caused by the non-stoichiometric composition, were observed in the experimental setup of the freestanding sample. This frequency-dependent investigation of an R–FE phase transformation is unlike previous macroscopic studies, in which heat dissipating metal contacts are used.
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Camargo, Javier, Santiago Osinaga, Mariano Febbo, Sebastián P. Machado, Fernando Rubio-Marcos, Leandro Ramajo, and Miriam Castro. "Piezoelectric and structural properties of bismuth sodium potassium titanate lead-free ceramics for energy harvesting." Journal of Materials Science: Materials in Electronics 32, no. 14 (June 26, 2021): 19117–25. http://dx.doi.org/10.1007/s10854-021-06430-3.

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50

Kornpom, Chittakorn, Thanya Udeye, and Theerachai Bongkarn. "The preparation of lead-free bismuth sodium titanate ceramics via the solid state combustion technique." Integrated Ferroelectrics 177, no. 1 (January 2, 2017): 59–68. http://dx.doi.org/10.1080/10584587.2017.1285173.

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