CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Fangzhe Li,Hua Ke,Hongjun Zhang,Liwei Zhang,Jinggeng Zhao,Huijiadai Luo,Lu Cao,Dechang Jia,Yu Zhou
In this work, we presented investigations on the microstructural, magnetic, dielectric and conductive properties of (1- x )Na 0.5 Bi 0.5 TiO 3 - x CoFe 2 O 4 (NBT-CFO) composite ceramics ( x = 0.1, 0.2, 0.3 and 0.5). The composites were synthesized using the in-situ sol-gel method, and the resulting CFO/NBT embedded structure was observed in the 0.9NBT–0.1CFO sample. Rietveld refinement confirmed that the embedded structure had remarkable effects on the c / a ratios of NBT-CFO composites. Increasing normalization saturation magnetizations were observed with increasing of CFO contents, thus revealing the influence of phase interfaces on magnetism . Dielectric relaxation anomalies were observed on both temperature dependent permittivity and loss spectra. Two sets of anomalies in these spectra were caused by space charges on the phase interfaces of embedded CFO grains and the NBT matrix. The conduction behavior of ceramics with and without the embedded structure obeyed the double power law and Jonscher's fraction power law, respectively, which inferred a transformation from the AC to the DC conduction mechanism with the disappearance of the embedded structure.
研究领域:
材料科学
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物理学
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Guoliang Xue,Zhiguo Wang,Jun Cao
In the search for dielectric material with high energy storage density, a ceramic system of 0.8Na 0.5 Bi 0.5 TiO 3 –0.2K 1- x Li x TaO 3 (NBT-KLT- x , x = 0.1–0.5) is proposed in this work. The addition of Li 2 CO 3 is conducive to the decrease of sintering temperature of ceramics. Moreover, the XRD diffraction data of sintered ceramics indicate that pure perovskite phase showing the pseudo-cubic structure can be achieved when x = 0.1–0.3 while the excessive addition of Li 2 CO 3 leads to the formation of pyrochlore phase. Based on the Rietveld refinement and Raman results, the Li + doping in the NBT-KLT- x solid solutions ( x = 0.1–0.3) can improve the phase content of P 4bm, induce the lattice expansion and structural change towards a higher-symmetry phase. TEM observation also demonstrates the reduction in the size of polar nanoregions. With increasing x from 0.1 to 0.5, both the oxygen vacancy concentration and grain size display a tendency to decrease first and then increase. For the x = 0.2 ceramics with the lowest oxygen vacancy concentration and grain size, the largest electrical breakdown strength and lowest polarization hysteresis are achieved, giving an excellent recoverable energy storage density of 4.86 J/cm 3 under 32 kV/mm, accompanied by a high efficiency of 90.46 %. Additionally, the recoverable energy density achieves a high level of ∼3.5 J/cm 3 and energy storage efficiency is larger than 80 % over 28–160 °C, suggesting the outstanding temperature stability.
研究领域:
材料科学
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能源技术
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DOI
高影响因子
Coatings
·
2024
·Vol. 14
·期 11
·1392
·
IF 2.9
Yangyang Zhang,Hui Li,Erping Wang,Jingxia Gao,Liqin Yue,Miao Zhao,Ling Zhang
NaNbO3-based ferroelectric composites are regarded as a highly promising typical energy storage material. In this work, 0.02xMnO2−(1−x)NaNbO3−xBi0.5Na0.5TiO3composites were prepared by the solid-state sintering method and their microstructure, energy storage performance, and temperature stability were analyzed. As observed by the SEM images, the addition of Bi0.5Na0.5TiO3to NaNbO3in appropriate amounts can effectively suppress grain growth, which is beneficial for improving the breakdown field strength. Whenx= 0.3, an optimal value of 210 kV/cm is achieved. Meanwhile, as 2θ = 33.2°, the most intense XRD peak can be observed, indicating excellent solid solubility between the phase components. Consequently, 0.006MnO2–0.7NaNbO3–0.3Bi0.5Na0.5TiO3composites demonstrated an impressive discharging storage density of 2.464 J/cm3and a considerable energy storage efficiency of 85.8%. In addition, within the temperature range of 30–80 °C, the fluctuation in energy storage density remains below 10%. All the above performances indicate that this type of material exhibits excellent practicality in the field of pulse power supply.
研究领域:
材料科学
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能源材料
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DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2021
·
IF 4.098
Chunlin Ma,Yao Wang,Jia Zhang,Ying Hu,Zhangyin Zhai,Jin Wu,Weiping Zhou,Xuewei Lv
A series of Dy 3+ doped Na 0.5 Bi 0.5 TiO 3 (NBT: x Dy 3+ , x = 0.003–0.018) lead-free ferroelectric ceramics were successfully prepared by a solid-state reaction method. The Dy 3+ ions composition dependent photoluminescence properties were systematically studied. All the samples display intense characteristic emission of Dy 3+ under an excitation wavelength of 454 nm, which are attributed to the transitions of 4 F 9/2 → 6 H J /2 ( J = 13, 11 and 9). All the samples show strong orange-yellow emission, which could be applied to warm white light hopefully. When the content of Dy 3+ is equal to 0.012, the ceramic has the optimal luminous performance. Remarkable thermal quenching of the luminous intensity ceramic occurs as the temperature is higher than initial temperature 293 K. Furthermore, Dy 3+ activated photoluminescence performance combined with the presence of ferroelectricity in the NBT host can be applied to developing non-contact optical temperature sensitive materials and other future novel optoelectronic devices.
研究领域:
材料科学
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光电子学
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铁电材料
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发光材料
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温度传感
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DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2023
·Vol. 106
·期 5
·2963-2971
·
IF 3.9
Nan Weng,Ji Zhang,Jiajia Wang,Tianze Pan,Jing Wang,Yaojin Wang
Ceramic capacitors with high electrostatic energy storage performances have captured much research interest in latest years. Sodium bismuth titanate (Na 0.5 Bi 0.5 TiO 3 )-based ferroelectric ceramics show great potential due to their environment-friendly composition, high polarization, and excellent relaxor properties. However, the nonergodic relaxor state of Na 0.5 Bi 0.5 TiO 3 -based ceramics hampers the decrement of remanent polarization, leading to poor energy storage performance. Herein, the (1 − x )Na 0.5 Bi 0.5 TiO 3 – x La(Ni 2/3 Ta 1/3 )O 3 ceramics were designed to generate the transformation between nonergodic and ergodic relaxor state. As a result, the ceramics exhibit improved dielectric relaxation, slim polarization–electric field loops, and flattened current–electric field curves due to highly dynamic polar nanoregions. Particularly, the 0.85Na 0.5 Bi 0.5 TiO 3 –0.15La(Ni 2/3 Ta 1/3 )O 3 ceramics show large breakdown electric field E b (345 kV/cm), high recoverable energy density W rec (3.6 J/cm 3 ), and efficiency η (80.6%), revealing potential applications in electrostatic energy storage.
研究领域:
材料科学
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能源存储
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DOI
高影响因子
Journal of Materials Chemistry C
·
2020
·Vol. 9
·期 4
·1353-1361
·
IF 7.059
Yuzhen Wang,Yanan Wang,Chaoyang Ma,Zhe Feng,Chuandong Zuo,Wanggui Ye,Chong Zhao,Yanbin Li,Zicheng Wen,Zhiquan Cao,Zhijun Cao,Xiaofei Shen,Chong Wang,Yingkui Li,Xuanyi Yuan,Yongge Cao
In this study, various Na0.5Bi0.5TiO3:0.5 at% Ho3+ (NBT:Ho) ceramics with different Yb3+ ion doping concentrations were synthesized by a conventional solid-state reaction method. Under the irradiation of a 980 nm laser, the NBT:Ho sample exhibited four distinguished emission bands centered at 525, 548, 656, and 753 nm. By co-doping Yb3+ ions into NBT as the sensitizers, the up-conversion luminescence of Ho3+ ions was greatly enhanced. The mechanism for up-conversion luminescence was determined to be a two-photon absorption process. The DFT simulations revealed that the Ho3+ 4f orbitals pass through the Fermi level and thus f–f transitions could be highly sensitive to temperature variation. Green emissions at 525 and 548 nm were ascribed to the two thermally coupled excited states 5F4 and 5S2 transferring to the ground state 5I8, respectively. The temperature-dependent population between 5F4 and 5S2 could be interpreted by Boltzmann's distribution in the range of 167–377 K. The relative sensitivities were calculated to be 6.14% K−1 at 167 K and 1.03% K−1 at 377 K, and the corresponding absolute sensitivities were estimated to be 0.09 × 10−3 K−1 and 2.11 × 10−3 K−1, respectively. The temperature resolution was calculated to be about 0.053 K at 167 K and 0.319 K at 377 K. The excellent repeatability of the NBT:Ho3+ ceramics was demonstrated by means of successive heating–cooling cycles in the range of 167–377 K. The above investigation results demonstrate the promising application of NBT:Ho in cryogenic optical thermometers.
研究领域:
材料科学
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物理学
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DOI
高影响因子
Materials
·
2026
·Vol. 19
·期 15
·3195
·
IF 3.7
Shibing Xiao,Huajun Sun,Huiting Sui
Dielectric capacitors are employed in defense and automotive applications owing to their ultrahigh charge–discharge rates. To mitigate the high leakage current density of Na0.5Bi0.5TiO3(NBT), SrTiO3(STO), which exhibits excellent insulation performance, is incorporated into the NBT lattice to enhance both the breakdown field strength and the relaxor characteristics. Furthermore, the ionic radius of Sr2+(0.1180 nm) is slightly larger than the average ionic radius of (NaBi)2+(0.1025 nm). As a result, the introduction of STO induces lattice distortion, disrupts long-range ordering, and promotes the formation of short-range ordered domains, thereby strengthening the relaxor behavior (the relaxation degree γ increased from 1.63 to 1.84). Consequently, the 0.95(Na0.5Bi0.5)(Fe0.02Ti0.99)O3-0.05SrTiO3thin film achieves a recoverable energy storage density (Wrec) of 43.88 J/cm3and an efficiency (η) of 73.95%. In addition, the thin film exhibits excellent temperature stability over a range of 10 to 170 °C, good frequency stability from 0.1 to 2.0 kHz, and robust fatigue endurance up to 1 × 108switching cycles. This work provides reliable technical and theoretical guidance for the application of NBT-based materials in energy storage.
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DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Huanghui Nie,Limei Ruan,Lu Hu,Xinran Wang,Fukang Chen,Shuai Zhou,Yangyang Wang,Taotao Ai,Yan Yan,Gang Liu
(1- x ) (0.98Na 0.5 Bi 0.5 TiO 3 –0.01BaTiO 3 –0.01BiFeO 3 )– x CaTiO 3 (NBB- x CT) ceramics were produced using traditional solid-state synthesis methods. The surface morphology , domain structure, and electrical properties of the ceramic samples were systematically studied. In addition, the temperature and frequency stabilities of the NBB-15CT sample at 200 kV/cm were tested. Generally, NBB- x CT ceramics exhibit a typical single perovskite phase structure. The results indicate that the NBB-15CT ceramics showed a high energy density of 3.14 J/cm 3 at 250 kV/cm. The piezoresponse force microscopy (PFM) results showed that the addition of CT broke the macrodomains of the 0.98Na 0.5 Bi 0.5 TiO 3 -0.01BaTiO 3 -0.01BiFeO 3 ceramic and helped to form nanodomains, leading to an improved energy storage performance. The above performance indicates that the specimens possess very good temperature-and frequency-dependent energy storage performances at 30–150 °C and 1–100 Hz. Moreover, the electric energy storage and release in the NBB-15CT ceramic indicated that the power density could reach 55.30 MV/cm 3 at 180 kV/cm. Therefore, the NBB-15CT ceramic is a promising material for electrical capacitors.
研究领域:
材料科学
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物理学
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Jingwen Lv,Simeng Song,Yan Jiao,Zhaoyu Yang,Yilin Zhang,Yingjie Fan,Chunlin Song,Gang Liu
A novel strategy of enhancing the dielectric and energy storage properties of Na 0.5 Bi 0.5 TiO 3 –BaTiO 3 (NBT–BT) ceramics by introducing a K 0.5 Na 0.5 NbO 3 (KNN) ferroelectric phase is proposed herein, and its underlying mechanism is elucidated. The lead-free KNN ceramic decreases the residual polarisation and increases the electric breakdown strength of the NBT–BT matrix through the simultaneous modification of its A-sites and B-sites. The obtained NBT−BT− x −KNN ceramics have a perovskite structure with unifying grains. A bulk 0.9NBT–BT–0.1KNN ceramic sample with a thickness of 0.2 mm possesses a high energy storage density of 2.81 J/cm 3 at an applied electric field of 180 kV/cm. Moreover, it exhibits good insulation properties and undergoes rapid charge and discharge processes. Therefore, the obtained 0.9NBT–BT–0.1KNN ceramic can be potentially used in high-power applications because of its high energy density , good insulation properties, and large discharge rate.
研究领域:
材料科学
·
能源存储
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Yao Lu,Carlos Alberto López,Jie Wang,José Antonio Alonso,Chunwen Sun
Na 0.5 Bi 0.5 TiO 3 (NBT) and its acceptor-doped perovskites , as lead-free piezoelectric materials before, have been found to be excellent oxygen-ion conductors with potential applications in intermediate-temperature solid oxide fuel cells (SOFCs). Among them, the Bi deficient and B-site Mg doped sodium bismuth titanate (Na 0.5 Bi 0.49 Ti 0.98 Mg 0.02 O 2.965 , NBTM) exhibits a remarkable oxygen ionic conductivity . Here, we report a structural analysis on NBT and NBTM ceramics using high-temperature in situ neutron diffraction (NPD) to gain insight into the effects of Mg doping on ionic conductivity and structure. Both perovskite oxides exhibit two consecutive phase transformations from R 3 c to P 4 bm at ∼400 °C and from P 4 bm to Pm 3 ¯ m at ∼600 °C. The effects of Bi deficiency and Mg substitution on oxygen vacancy concentration and ion displacements are revealed. In addition, a NBTM supported single cell consisting of Ag-NBTM cathode and Ni-NBTM anode is fabricated to evaluate the possibility of its application in intermediate-temperature SOFCs. The structural stability of NBTM is still a major concern that hinders its utilization at high temperature and under reducing atmosphere.
研究领域:
材料科学
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能源工程
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DOI
高影响因子
JOURNAL OF MATERIALS RESEARCH
·
2026
·
IF 2.9
Li Xiaolan,Li Yang,Li Xuexin,Zhang Jihao,Wang Haozhang,Hu Siheng,Lei Ruixin,Liao Wenyong,Li Chunchun,Li Fei,Li Jinglei
High-power pulse systems demand dielectric ceramics with high recoverable energy storage density ( W rec ), efficiency, and stability. Relaxor ferroelectrics are promising due to high polarization and low loss. In this work, a binary solid solution of 0.7Na 0.5 Bi 0.5 TiO 3 -0.3Sr 0.7 Bi 0.2 TiO 3 was used as the base composition. A series of high-entropy relaxor ferroelectric ceramics, (1- x )(0.7NBT-0.3SBT)- x (Ca 0.5 Ba 0.5 )(In 0.5 Ta 0.5 )O 3 ( x = 0.05 ~ 0.30), featuring highly disordered crystal structures, were synthesized via a solid-state reaction method through simultaneous multi-cation doping at both the A- and B-sites. Characterization techniques including structural analysis, morphology observation, and basic electrical property measurements demonstrated that this A/B-site co-doping strategy effectively enhanced the relaxor characteristics. Systematic evaluation of energy storage performance identified the optimal composition ( x = 0.1), which achieves a W rec of 1.1 J·cm −3 at 110 kV·cm −1 , representing a relatively high value for bulk ceramics under moderate electric fields. These findings provide experimental support and a technical reference for developing high-performance energy storage ceramics. Graphical abstract The alternative text for this image may have been generated using AI.
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高影响因子
Journal of Materials Chemistry A
·
2021
·Vol. 10
·期 2
·891-901
·
IF 12.732
Fan Yang,Yidong Hu,Qiaodan Hu,Sebastian Steiner,Till Frömling,Linhao Li,Patrick Wu,Emilio Pradal-Velázquez,Derek C. Sinclair
Bulk conductivity (σb) values of nominally stoichiometric Na0.5Bi0.5TiO3 (NBT) prepared by solid-state reaction collated from literature show random variation between 10−6 to 10−3 S cm−1 (at 600 °C). This makes it challenging to obtain reliable and reproducible performances of NBT-based devices, especially as the underlying reason(s) for this variance are not fully understood. Here we report the dramatic impact of the TiO2 reagent, in particular, the polymorphic form of TiO2 on the electrical conductivity and conduction mechanism of NBT. Based on our solid-state processing route, NBT ceramics prepared by rutile TiO2 are ionically conductive, and those prepared by anatase TiO2 are insulating. The dramatic difference in electrical properties of NBT prepared using rutile and anatase TiO2 is related to the NBT formation process: the intermediate phase Bi12TiO20 is more stable during formation of NBT in the case of anatase TiO2, which reduces the volatility of Bi2O3 during solid-state reaction. These results give plausible explanations for the large variation of σb reported in the literature and highlight the importance of selecting an appropriate TiO2 reagent when targeting controllable σb in NBT-based ceramics. For ion-conducting applications (such as in intermediate-temperature solid oxide fuel cells, IT-SOFCs), rutile TiO2 should be used, and for dielectric applications (such as in multilayer ceramic capacitors, MLCC) anatase TiO2 should be used.
研究领域:
材料科学
·
陶瓷工程
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）