Phase evolution, microstructure, electric properties of (Ba1-xBi0.67xNa0.33x)(Ti1-xBi0.33xSn0.67x)O3 ceramics

Chen, Xiuli; Li, Xu; Zhou, Huanfu; Sun, Jie; Li, Xiaoxia; Yan, Xiao; Sun, Congcong; Shi, Ji‐Lei

doi:10.1007/s40145-019-0326-4

Cited by 48 publications

(9 citation statements)

References 40 publications

(37 reference statements)

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“…Meanwhile, the temperature in the vicinity of maximum dielectric constant (T m ) almost linearly decreases with the increase of x value as shown in the www.springer.com/journal/40145 It is well known that relaxor ferroelectrics have two obvious characteristics: the first one is the T m shifts toward high temperature as frequency increases, and the second one is the dielectric constant at T m decreases with the increase of frequency [31]. It should be noted that the dielectric constant of normal ferroelectric follows the Curie-Weiss law at temperature above T m ; however, the relaxor ferroelectric deviates from the Curie-Weiss law and follows the modified model [32,33]…”

Section: Resultsmentioning

confidence: 99%

P-E hysteresis loop going slim in Ba0.3Sr0.7TiO3-modified Bi0.5Na0.5TiO3 ceramics for energy storage applications

Shen

et al. 2020

J Adv Ceram

105

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Ba 0.3 Sr 0.7) x (Bi 0.5 Na 0.5) 1-x TiO 3 (BS x BNT, x = 0.3-0.8) ceramics were prepared to investigate their structure, dielectric and ferroelectric properties. BS x BNT ceramics possess pure perovskite structure accompanied from a tetragonal symmetry to pseudo-cubic one with the increase of x value, being confirmed by X-ray diffraction (XRD) and Raman results. The T m corresponding to a temperature in the vicinity of maximum dielectric constant gradually decreases from 110 ℃ (x = 0.3) to-45 ℃ (x = 0.8), across T m = 36 ℃ (x = 0.5) with a maximum dielectric constant (ɛ r = 5920 @1 kHz) around room temperature. The saturated polarization P s gradually while the remnant polarization P r sharply decreases with the increase of x value, making the P-E hysteresis loop of BS x BNT ceramics goes slim. A maximum difference between P s and P r (P s-P r) is obtained for BS x BNT ceramics with x = 0.5, at which a high recoverable energy density (W rec = 1.04 J/cm 3) is achieved under an applied electric field of 100 kV/cm with an efficiency of  = 77%. Meanwhile, the varied temperature P-E loops, fatigue measurements, and electric breakdown characteristics for the sample with x = 0.5 indicate that it is promising for pulsed power energy storage capacitor candidate materials.

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Section: Resultsmentioning

confidence: 99%

P-E hysteresis loop going slim in Ba0.3Sr0.7TiO3-modified Bi0.5Na0.5TiO3 ceramics for energy storage applications

Shen

et al. 2020

J Adv Ceram

105

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“…7 a-c shows the Nyquist plot at 350 ºC, 400 ºC, and solid line is the fitted plot. In the low-frequency region, the radius of the semicircles decreases with the increase in temperature, which characterises the negative temperature coefficient of resistance (NTCR) type behaviour of the samples [20,[51][52][53]. Such type of behaviour can be attributed to the decrease in grain and grain boundary resistances with increasing temperature (Table 3) as these resistances are related to the diameter of the semicircles.…”

Section: Temperature-dependent Dielectric Analysismentioning

confidence: 99%

“…8(a-c) displays the variation of the imaginary part (Z'') of impedance with frequency on a log scale at various temperatures. The impedance peaks are shifted towards higher frequencies as the temperature increases, indicating the relaxation behaviour for all samples [51]. Z'' follows a decreasing trend with increase in temperature and frequency, which may be attributed to the rise in conductivity as the temperature and frequency increases [53].…”

Section: Temperature-dependent Dielectric Analysismentioning

confidence: 99%

Structural, dielectric and ferroelectric properties of Cu2+- and Cu2+/Bi3+-doped BCZT lead-free ceramics: a comparative study

Kumari

Kumar

et al. 2021

J Mater Sci: Mater Electron

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Perovskite typeBa0.98Ca0.02Zr0.02Ti0.98O3 (BCZT), Ba0.98Ca0.02Zr0.02Ti0.976Cu0.008O3 (BCZTC) and Ba0.9725Bi0.005Ca0.02Zr0.02Ti0.976Cu0.008O3(BCZTCB) lead-free ceramics were synthesised via solid-state reaction method at a sintering temperature of ~1380 °C. Effects of CuO and Bi2O3/CuO doping on structural, microstructural, dielectric, and ferroelectric properties were investigated systematically. X-ray diffraction technique confirmed the existence of pure perovskite phase with the tetragonal structure in pure and in the doped BCZT ceramics at room temperature. The dielectric analysis demonstrated two anomalies around 24 °C and 126 °C for BCZT, which were identified as orthorhombic to tetragonal (TO-T) and tetragonal to cubic (TC) phase transition temperature, respectively. The TO-T temperature shifted to below 16 °C, while the TC increased to 132 °C for the BCZTCB sample. The physical mechanisms of the conduction processes were investigated through impedance spectroscopy and the values of resistance, conductivity, and activation energies associated with the grain and grain boundaries were evaluated. The activation energy was determined to be higher for doped samples than for pure BCZT. Further, the dopant-dependent ferroelectric nature of the ceramic samples was evidenced by the analysis of characteristic hysteresis loop, and a value of remnant polarisation (Pr = 4.59 C/cm 2 ) was obtained for the BCZTCB ceramic sample. Furthermore, the d33 value, which was 54 pC/N for pure BCZT, was determined to be 140 pC/N and 64 pC/N for BCZTC and BCZTCB, respectively.

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“…Noted that a high P r and poor sintering behavior of pure BNT ceramic result in a low W rec . Different methods, therefore, are utilized to improve W rec such as chemical doping, glass modi cation, multilayer structure design, advanced sintering technology [12][13][14][15][16][17]. For chemical doping, it can be divided into chemical equivalent and aliovalent doping.…”

Section: Introductionmentioning

confidence: 99%

Remarkably Enhanced Dielectric Stability and Energy Storage Properties in BNT-BST Relaxor Ceramics by A-Site Defect Engineering for Pulsed Power Applications

Shen

et al. 2021

Preprint

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Lead-free bulk ceramics for advanced pulsed power capacitors show relatively low recoverable energy storage density (Wrec) especially at low electric field condition. To address this challenge, we proposed an A-site defect engineering to optimize the electric polarization behavior by disrupting the orderly arrangement of A-site ions, in which Ba0.105Na0.325Sr0.245−1.5xð0.5xBi0.325+xTiO3 (BNS0.245−1.5xð0.5xB0.325+xT, x = 0, 0.02, 0.04, 0.06, 0.08) lead-free ceramics were selected as the representative. The BNS0.245−1.5xð0.5xB0.325+xT ceramics were prepared by using pressureless solid state sintering and achieved large Wrec (1.8 J/cm3) at a low electric field (@110 kV/cm) when x = 0.06. The value of 1.8 J/cm3 is super high as compared to all other Wrec in lead-free bulk ceramics under a relatively low electric field (< 160 kV/cm). Furthermore, a high dielectric constant of 2930 ± 15% in a wide temperature range of 40 ~ 350°C was also obtained in BNS0.245−1.5xð0.5xB0.325+xT (x = 0.06) ceramics. The excellent performances can be attributed to the A-site defect engineering, which can reduce Pr and improve the thermal evolution of polar nanoregions (PNRs). This work confirms that the BNS0.245−1.5xð0.5xB0.325+xT (x = 0.06) ceramics are desirable for advanced pulsed power capacitors, and will push the development of a series of BNT-based ceramics with high Wrec and high temperature stability.

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Phase evolution, microstructure, electric properties of (Ba1-xBi0.67xNa0.33x)(Ti1-xBi0.33xSn0.67x)O3 ceramics

Cited by 48 publications

References 40 publications

P-E hysteresis loop going slim in Ba0.3Sr0.7TiO3-modified Bi0.5Na0.5TiO3 ceramics for energy storage applications

P-E hysteresis loop going slim in Ba0.3Sr0.7TiO3-modified Bi0.5Na0.5TiO3 ceramics for energy storage applications

Structural, dielectric and ferroelectric properties of Cu2+- and Cu2+/Bi3+-doped BCZT lead-free ceramics: a comparative study

Remarkably Enhanced Dielectric Stability and Energy Storage Properties in BNT-BST Relaxor Ceramics by A-Site Defect Engineering for Pulsed Power Applications

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