查找使用阿拉丁产品的科研文献

Effects of glass additives on microstructure, dielectric and ferroelectric properties of BaTiO3–BiYbO3 based ceramics

Gang Chen,Tao Fan,Shilong Zhang,Cong Xie,Chunlin Fu,Rongli Gao,Zhenhua Wang,Xiaolin Deng,Peigeng Fan,Wei Cai

(100–x) wt% (0.95BT–0.05BY)–x wt% (0.5MgO–0.5SiO2) (x = 0, 1, 2, 4, 8) ceramics were fabricated by using a solid-state synthesis method. The effects of the MgO–SiO2 doping on the microstructure, the ferroelectric, and the dielectric properties of BT–BY ceramics were investigated in detail. The results show that the relative permittivity initially decreases and then increases again upon the increase in the MgO–SiO2 content. The addition of the MgO–SiO2 glass oxide dopant enhances the frequency and the temperature stability of the relative permittivity of BT–BY ceramics. Moreover, the coercive field and the remnant polarization increase and then decrease with increasing MgO–SiO2 dopant content, while the slim P–E loops are observed when x ≥ 2. The largest values for the remanent polarization (1.2 μC cm−2) and the coercive field (9.18 kV cm−1) are obtained at x = 1. The addition of MgO–SiO2 can induce a small leakage current in the BT–BY ceramic when x ≥ 2. The breakdown strength increases with decreasing grain size when MgO–SiO2 is added moderately. Its value increases from 80 kV cm−1 up to 100 kV cm−1 when x changes from 0 to 8. The energy storage density and efficiency of the (100–x) wt% (0.95BT–0.05BY)–x wt% (0.5MgO–0.5SiO2) ceramics decrease and then increase with increasing x. The maximum values of the electrical energy storage density (0.24 J cm−3) and energy efficiency (85.77%) are obtained when x = 8.

Enhanced dielectric relaxation and low-electric-field energy storage properties of NaNbO3 ceramics prepared by co-doping MgO and BiYbO3

Xue Bai,Tao Fan,Gang Chen,Jie Wang,Cong Ji,Chao Chen,Zixuan Zhang,Wei Cai,Rongli Gao,Chunlin Fu

NaMg 0.12 Nb 0.88 O 3 - x BiYbO 3 (abbreviated as NMN- x BY) ( x  = 0, 0.005, 0.01, 0.015, 0.02, 0.04 and 0.08) ceramics were fabricated by using a traditional solid-state reaction method. The crystal structure, morphology, relaxation behavior and energy storage properties of NMN- x BY) ceramics were systematically investigated. X-ray diffraction patterns (XRD) demonstrates that all samples present a single pseudo-cubic phase. It is also found that the grain sizes vary irregular with the BY content, and it can be reduced by the appropriate addition of BY content as indicated by scanning electron morphology. From the measured dielectric properties , it can be seen that all samples are transformed from normal ferroelectric (FEs) to relaxor ferroelectric (RFEs). The maximum relaxor diffuseness coefficient γ (∼1.78) is obtained for 0.98NMN-0.02BY ceramic. As x increases, the polarization-electric ( P - E ) hysteresis loops gradually become slimmer. The largest discharged energy density (∼0.998 J/cm 3 ) and the maximum energy efficiency (∼70%) are obtained at 170 kV/cm for x  = 0.04. Meanwhile, the discharge energy densities present relatively excellent temperature stability for x  = 0.02 in the temperature range from 20 to 140 °C. This work demonstrates a wide potential application in enhancing the storage properties of lead-free ferroelectric materials by co-doping MgO and bismuth-based perovskites .

Effects of Sintering Method and BiAlO3 Dopant on Dielectric Relaxation and Energy Storage Properties of BaTiO3–BiYbO3 Ceramics

Xin Yi,Cong Ji,Gang Chen,Hongqi Yang,Hualei Yong,Chunlin Fu,Wei Cai,Rongli Gao,Tao Fan,Zhenhua Wang,Xiaoling Deng

(0.9 – x )BaTiO 3 –0.1BiYbO 3 – x BiAlO 3 ( x = 0, 0.02, 0.04, and 0.08) lead-free ferroelectric ceramics are synthesized using conventional sintering (CS) and microwave sintering (MWS) methods. The microstructure, dielectric and ferroelectric properties, relaxation behavior, and energy storage properties are investigated systematically. X-ray diffraction (XRD) patterns show a single perovskite phase for all samples. Scanning electron microscope (SEM) images indicate that MWS method can impede the grain growth, whereas the introduction of BiAlO 3 can lead to the increase in the grain size. Dielectric measurements reveal that an obvious dielectric relaxation behavior can be strengthened by MWS, and the improvement of the dielectric constant ( ε r ) of ceramics is realized by MWS. Incorporated with BiAlO 3 contributes to enhancement of the frequency and temperature stabilities of the dielectric constant for BaTiO 3 –BiYbO 3 ceramics. The slim hysteresis loops are observed, and the maximum polarization of the sample sintered by MWS is higher than that sintered by CS. The MWS samples possess a higher energy density which is about 2 times larger than that of CS samples, and the largest energy storage density ≈0.86 J cm −3 and energy storage efficiency ≈97.44% are, respectively, obtained at x = 0 and 0.04 for MWS ceramics.

Effects of sintering method and BiFeO3 dopant on the dielectric and ferroelectric properties of BaTiO3–BiYbO3 based solid solution ceramics

Gang Chen,Xiaodong Peng,Chunlin Fu,Wei Cai,Rongli Gao,Peigeng Fan,Xin Yi,Hongqi Yang,Cong Ji,Hualei Yong

(0.95– x ) BaTiO 3 –0.05 BiYbO 3 – x BiFeO 3 ( x  = 0, 0.01, 0.02, and 0.04) (abbreviated as (0.95– x ) BT–0.05 BY– x BFO) ceramics were fabricated by conventional sintering (CS) and microwave sintering (WS) methods. Effects of sintering method and BFO dopant on the microstructure and electric properties of (0.95– x ) BT–0.05 BY– x BFO ceramics were comparatively investigated. X-ray diffraction showed that all CS and WS samples presented a single perovskite phase. It was also found that WS ceramics possessed denser microstructure and finer grains compared to CS samples as indicated by the surface morphology characterization. Dielectric measurements revealed that all samples exhibited the weak relaxation behavior; however, the degree of relaxation behavior of BT–BY based ceramic could be strengthened by addition of BFO and by WS method. Moreover, the temperature and frequency stability could be improved with doped BFO. The density of 0.93BT–0.05BY–0.02BFO ceramic was found to be the largest while that of 0.94BT–0.05BY–0.01BFO ceramic was the smallest, thus, the dielectric constant of 0.93BT–0.05BY–0.02BFO was significantly larger than that of 0.94BT–0.05BY–0.01BFO and 0.94BT–0.05BY–0.04 BFO ceramics. minimum dielectric constant of (0.95– x ) BT–0.05 BY– x BFO ceramic was obtained at x  = 0.01. Ferroelectric measurements indicated that all samples showed the slim hysteresis loop. The remnant polarization ( P r ) and coercive field ( E C ) of (0.95– x ) BT–0.05 BY– x BFO ceramics first decreased and then increased with increasing x ，the minimum values were obtained at x  = 0.01. Moreover, P r and E C of WS ceramics were slightly larger than those of CS ceramics, indicating that higher density and larger grain sizes contributed to enhancing the ferroelectric characteristic. These findings indicate that addition of moderate amount of BFO and use of WS technique can strengthen the degree of relaxation behavior and improve the ferroelectric properties of BT–BY based ceramics.

Sol-Gel Synthesis and Characterization of (1–x–y)BiYbO3-xLiNbO3-yBaTiO3 Ceramics

Gang Chen,Chunyan Deng,Xiaodong Peng,Chunlin Fu,Wei Cai,Rongli Gao,Xiaoling Deng

Study on the structure and properties of (1-x) BiYbO3-xBaTiO3 ceramics synthesized by sol–gel method

Gang Chen,Chunlin Deng,Xiaodong Peng,Chunlin Fu,Wei Cai,Rongli Gao,Xiaoling Deng

Synergistic effect to improve energy storage performance in <111> textured BNT-based ceramics under low electric field via orientation engineering as well as co-doping BY and STO

Gang Chen,Xue Bai,Cong Ji,Zhijun Zhou,Zixuan Zhang,Chao Chen,Zhengtang Su,Wei Cai,Rongli Gao,Chunlin Fu

Bi 0.5 Na 0.5 TiO 3 ceramic is a promising dielectric energy storage material due to its high spontaneous polarization (> 40 μC/cm 2 ) . Although many studies have been carried out to enhance the energy storage performance of Bi 0.5 Na 0.5 TiO 3 ceramic, achieving better energy storage performance is still a considerable challenge. Herein, Bi 0.5 Na 0.5 TiO 3 -BiYbO 3 -SrTiO 3 (BNT-BY-STO) relaxor ferroelectric ceramics were constructed, and <111>-oriented (1- x )(0.99BNT-0.01BY)- x STO ceramics were successfully fabricated by a templated grain growth method. The moderate energy storage performance (the reversible energy storage density of 3.26 J/cm 3 and energy storage efficiency of 76.3% under 290 kV/cm) can be achieved in <111>-oriented 0.8(0.99BNT-0.01BY)-0.2STO ceramics. The enhanced energy storage performance of textured BNT-BY-STO ceramics could be mainly attributed to the grain refinement of STO, and the improved breakdown strength and relaxation behavior caused by orientation engineering. These findings demonstrate that the co-doping of BY and STO and orientation engineering are effective strategies for improving the energy storage performance of BNT ceramic.