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A series of (1-x)Bi0.48La0.02Na0.48Li0.02Ti0.98Zr0.02O3-xNa0.73Bi0.09NbO3 ((1-x)LLBNTZ-xNBN) (x = 0-0.14) ceramics were designed and fabricated using the conventional solid-state sintering method. The phase structure, microstructure, dielectric, ferroelectric and energy storage properties of the ceramics were systematically investigated. The result...
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(Bi0.5Na0.5)0.94Ba0.06Ti1−x(Y0.5Nb0.5)xO3 (abbreviated as BNTBT-100xYN) lead-free relaxor ceramics were designed and prepared using a traditional solid-state sintering technique. The influences of the introduction of (Y0.5Nb0.5)4+ complex ions for the dielectric properties and energy storage performances of BNTBT-100xYN ceramics were systematically...
Citations
... Where P r is the remnant polarisation and P m is the maximum polarisation, W r is recoverable energy, W l is the loss and P 0 is the initial polarisation in the charge discharge process. However, majority of research in energy density applications has concentrated on the high electric field [20][21][22][23][24]. This factor could restrict its feasible applications when integrated into the realm of portable, wearable and flexible electronic systems, which have gained importance in contemporary society. ...
This study highlights the effect of copper oxide (CuO) doping on electrocaloric (EC) and energy storage (ES) properties of solid state synthesised 1-x(0.6[Ba(Zr0.2Ti0.8)O3]-0.4[(Ba0.7Ca0.3)TiO3])-xCuO (1-xBZCT-xCuO) ceramics with x = 0.005 to 0.05. The x-ray diffraction (XRD) analysis evidences the formation of impurity free 1-xBZCT-xCuO ceramics. Further, XRD, Raman and temperature dependent dielectric studies reveal that the inclusion of CuO into the BZCT lattice suppresses the morphotropic phase boundary (MPB) and reduces the tetragonality (c/a ratio) and consequently enhances the diffused phase transition (DPT) behaviour. The Curie temperature (Tc) shifted towards lower temperature, as the CuO content increases in 1-xBZCT-xCuO ceramics. Significantly, 0.995BZCT-0.005CuO ceramics demonstrated a maximum recoverable energy density (Wr) of 398 mJ/cm³ with an efficiency of 90 % under electric field of 100 kV/cm with an excellent heat stability. Moreover, EC effect exhibited a temperature change of 1.02 K at 30 kV/cm and a responsivity of 0.03 Kcm/kV near Tc.
... In order to investigate the storage ability, the energy storage density, energy loss density, and energy storage efficiency are calculated using Eqs. (6), (7), and (8) [81]. ...
... The reduction of energy storage efficiency to 6% for GFO1.3 is consistent with the leakage current density of this sample. As the leakage current increases, the energy loss density increases and reduces the storage efficiency [81]. ...
In this work, we report the effect of gallium content on the structure and electric, magnetic, and magnetoelectric properties of hydrothermally synthesized GaxFe2−xO3 (x = 0.7, 1 & 1.3) nanocrystalline samples. The crystal structure of samples is a single-phase trigonal structure with space group R3-c\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$R\mathop 3\limits^{ - } c$$\end{document} (167). The Rietveld refinement analysis confirmed the non-perovskite structure with random occupancy of Ga/Fe ions in the hexagonal lattice and shows a decrease in lattice parameters and volume with increasing Ga content. The temperature-dependent magnetizations reveal the ferrimagnetic nature of the samples at room temperature (RT), and the canted spin state decreased with Ga content. Ferroelectric polarization confirms the existence of ferroelectricity in our samples. The leakage current density, frequency-dependent dielectric constant, and polarization increase with increasing Ga concentration. Magnetoelectric studies show a linear ME coupling response for GaxFe2−xO3 samples, and the ME coupling coefficient at RT is high for GFO (αME = 27ps/m) with x = 1 composition.
... While the addition of lanthanum oxide has shown promise in improving electric field-induced strain in BNKT-based solid solutions, the electrostriction and electric field-induced energy storage properties of lead-free piezoelectric materials, specifically BNT-based ceramics doped with complex perovskite materials containing La 2 O 3 , remain relatively unexplored [29]. One such intriguing complex perovskite material, BNKT-ST, has garnered attention for its exceptional dielectric properties, boasting a remarkably high dielectric constant [30][31][32][33][34][35][36][37][38]. In the present research, studies the crystal structure, microstructure, dielectric, ferroelectric characteristics, and energy storage abilities of the BNKT-ST ceramics were synthesized with the aim of improving their electrical and energy storage properties [39]. ...
... Initially, all carbonate powders underwent a drying process at 100 • C for 24 h to eliminate any moisture. The raw materials for BNKT-ST and La 2 CO 3 were meticulously weighed according to stoichiometry, ball-milled for 24 h in an ethanol solution, and subsequently dried in an oven [30][31][32][33][34][35][36][37]. A small quantity of polyvinyl alcohol (PVA) binders (5 wt %) was added to the obtained powders before uniaxial pressing into discs with an 8 mm diameter. ...
... In recent years, revived interest has been devoted to improving BNT's properties for this important topic [5][6][7][21][22][23][24]. Several substitutions in both the A and/or B sites have been tried, and interesting room energy storage properties were reported for BNTbased systems. ...
... In recent years, revived interest has been devoted to improving BNT's properties for this important topic [5][6][7][21][22][23][24]. Several substitutions in both the A and/or B sites have been tried, and interesting room energy storage properties were reported for BNTbased systems. However, only a few works have been interested in high-temperature applications [23][24][25][26][27][28]. In our previous work, we showed that doping BNT ceramics with rare earth elements induced a high dielectric stability with low dielectric losses as well as improved energy storage at a high temperature that exceeded 200 • C [27,28]. ...
... As reported in our previous work, the film prepared via the chemical method exhibited the coexistenc of the rhombohedral R3c and tetragonal P4bm phases, as expected with the bulk BNT 0.06 BT composition in the vicinity of the MPB region. A more detailed discussion can b found in Ref. [23]. However, the film prepared via the PLD method was also polycrystal line with a dominant pseudo-cubic perovskite and a (001) preferential orientation. ...
Bi0.5Na0.5TiO3-0.06BaTiO3 (BNT-BT) thin films were prepared via both chemical solution (CSD) and pulsed laser deposition (PLD). The structural, dielectric, and ferroelectric properties were investigated. High stability of the dielectric permittivity or TCC (∆ε/ε (150 °C) ≤ ±15%) over a wide temperature range from room temperature to 300 °C was obtained. Distinctly, the CSD film showed high TCC stability with variation of ±5% up to 250 °C. Furthermore, the CSD film showed an unsaturated ferroelectric hysteresis loop characteristic of the ergodic relaxor phase. However, the PLD one exhibited an almost saturated loop characteristic of the coexistence of both ergodic and non-ergodic states. The energy storage properties of the prepared films were determined using P–E loops obtained at different temperatures. The results show that these films exhibited a stable and improved energy storage density comparable to ceramic capacitors. Moreover, the CSD film exhibited more rigidity and better energy storage density, which exceeded 1.3 J/cm3 under a weak applied field of 317 kV/cm, as well as interesting efficiency in a large temperature range. The obtained results are very promising for energy storage capacitors operating at high temperatures.
... In the later years, a revival interest is devoted to improve BNT-properties for this soaring topic [5][6][7][21][22][23][24]. Several substitutions in both A-and/or B-sites are tried, and interesting room energy storage properties were reported for BNT-based systems. ...
... In the later years, a revival interest is devoted to improve BNT-properties for this soaring topic [5][6][7][21][22][23][24]. Several substitutions in both A-and/or B-sites are tried, and interesting room energy storage properties were reported for BNT-based systems. However, only a few works are interested in high temperature applications [23][24][25][26][27][28][29]. In our previous work, we have shown that doping BNT ceramics with rare earth elements induced a high dielectric stability with low dielectric losses as well as improved energy storage at high temperature exceeded 200°C [27][28][29]. ...
... composition in the vicinity of the MPB region. A more detailed discussion could be found in ref. [23]. However, the film prepared by PLD method is also polycrystalline with a dominant pseudo-cubic perovskite and a (001) preferential orientation. ...
Bi0.5Na0.5TiO3-0.06BaTiO3 (BNT-BT) thin films were prepared by both chemical solution (CSD) and pulsed laser deposition (PLD). The microstructure, dielectric, and ferroelectric properties were investigated. High stability of the dielectric permittivity (∆ɛ/ɛ(150 °C) ≤ ± 15%) over a wide temperature range from room temperature to 300 °C was obtained. Distinctly, the CSD film showed high TCC stability with variation of ± 5% up to 250°C. Furthermore, the CSD film showed an unsaturated ferroelectric hysteresis loop characteristic of the ergodic relaxor phase, however the PLD one exhibited almost saturated loop signature of the coexistence of both ergodic and non-ergodic states. The energy storage properties of the prepared films were determined using the P–E loops obtained at different temperatures. The results showed that these films exhibit stable and improved energy storage density comparable to the ceramic capacitors. Moreover, the CSD film exhibited more rigidity and better energy storage density that exceeds 1.3 J/cm3 under low applied field of 317 KV/cm as well as interesting efficiency in a large temperature range. The obtained results are very promising for energy storage capacitors operating at high temperatures.
... It is well known that BiFeO 3 -based ceramics usually possess high conductivity, which is commonly ascribed to either the presence of Comparison of sintering temperature and W rec of 3BF ceramics with other lead-free ceramics. 12,[22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38] point defects (reduced Fe 3þ and/or oxygen vacancies) or the secondary phases. 20 Therefore, the conductivity of the 100xBF ceramics could be enhanced owing to the BF additions, resulting in increased hysteresis in the P-E loops. ...
... It should be noted that the 3BF ceramics were sintered under a relatively low temperature of 950 C. A comparison of sintering temperature and W rec between 3BF ceramics and other leadfree dielectrics is exhibited in Fig. 3(g). 12,[22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38] 3BF ceramics can be sintered under a low temperature and exhibit high energy storage performance, indicating its great potential to be co-fired with the Ag-Pd electrodes with a high Ag content for low-cost MLCCs. ...
Dielectric ceramics with high polarization and low sintering temperature are important for high-performance and low-cost multilayer ceramic capacitors (MLCCs). Herein, BiFeO3 was added to a lead-free composition 0.48BaTiO3-0.4Bi(Mg0.5Hf0.5)O3-0.12SrTiO3 to lower the sintering temperature and increase the polarization simultaneously. As a result, a low sintering temperature of 950 °C and high comprehensive energy storage properties with a recoverable energy density Wrec of 5.7 J/cm3 and an energy efficiency η of 92% at 450 kV/cm were achieved. Together with the good temperature stability and cycling stability of Wrec and η, the ceramics exhibit great potential in the energy storage MLCCs with low-cost Ag-Pd electrodes with a high Ag content.
... In the present study, the γ value increases from 1.53 to 1.73 with increasing KNN, which indicate that all the compositions are characterized by a diffuse phase transition. Based on the above result, we select to estimate the thermal stability of the relative permittivity of the last two NBTKNx samples by the temperature coefficient of capacitance (TCC), which is obtained by equation (3) [46]. ...
... Unfortunately, most of these materials are lead-based, which is toxic and harmful to human health and the environment [15]. Alternatively, ferroelectric relaxors can also store a large amount of electrical energy because they have a slim hysteresis loop and a large saturation polarization, and a high coercive field [16][17][18][19][20][21]. ...
Citation: Alaoui, I.H.; Moussa, M.; Lemée, N.; Le Marrec, F.; Cantaluppi, A.; Favry, D.; Lahmar, A. Influence of the Addition of Rare Earth Elements on the Energy Storage and Optical Abstract: Rare earth element-doped Bi 0.5 Na 0.5 TiO 3-BaTiO 3 (BNT-BT-RE) polycrystalline thin films were processed on a platinized substrate by chemical solution deposition. The microstructure, dielectric, and ferroelectric properties were investigated for all prepared films. It was found that the incorporation of rare earth elements into the BNT-BT matrix increases both the dielectric constant and the breakdown strength while maintaining low dielectric losses, leading to an enhancement of the energy storage density to W rec = 12 and 16 J/cm 3 under an effective field of E = 2500 kV/cm, for Nd-and Dy-based films, respectively. The optical properties of films containing the lanthanide element were investigated and the obtained results bear interest for luminescence applications. The simultaneous appearance of ferroelectric and optical properties in the system under investigation is very promising for advanced optoelectronic devices.
... Unfortunately, most of these materials are lead-based, which is toxic and harmful to human health and the environment [15]. Alternatively, ferroelectric relaxors can also store a large amount of electrical energy because they have a slim hysteresis loop and a large saturation polarization, and a high coercive field [16][17][18][19][20][21]. ...
Rare earth element-doped Bi0.5Na0.5TiO3–BaTiO3 (BNT–BT–RE) polycrystalline thin films were processed on a platinized substrate by chemical solution deposition. The microstructure, dielectric, and ferroelectric properties were investigated for all prepared films. It was found that the incorporation of rare earth elements into the BNT–BT matrix increases both the dielectric constant and the breakdown strength while maintaining low dielectric losses, leading to an enhancement of the energy storage density to Wrec = 12 and 16 J/cm3 under an effective field of E = 2500 kV/cm, for Nd- and Dy-based films, respectively. The optical properties of films containing the lanthanide element were investigated and the obtained results bear interest for luminescence applications. The simultaneous appearance of ferroelectric and optical properties in the system under investigation is very promising for advanced optoelectronic devices.
... Figure 4f describes the comparison of W r and g between 0.90NN-0.10BLMT ceramic with other leadfree energy storage ceramics [7,21,31,[37][38][39][40][41][42][43][44][45][46][47][48][49][50][51][52][53][54]. It can be seen that compared with other energy storage ceramics listed, 0.90NN-0.10BLMT ...
Advanced energy storage ceramics are specially beneficial to pulsed power technologies on account of first-class reliability and ultrafast discharge rate. However, the inferior energy storage performance hinders their further applications in the field of energy storage. In this work, a comprehensive strategy was adopted to synthesize the (1 − x)NaNbO3-x(Bi0.5La0.5)(Mg2/3Ta1/3)O3 ((1 − x)NN-xBLMT) lead-free ceramics by traditional solid-state method. Polar nano-regions are generated and the grain size is reduced to the microscale by introducing complex ions of (Bi0.5La0.5)(Mg2/3Ta1/3)⁶⁺ into the NN ceramic. The enhanced recoverable energy storage density (Wr = 3.69 J/cm³) and a high efficiency (η = 78%) can be realized simultaneously in 0.90NN-0.10BLMT ceramic at 440 kV/cm. Moreover, the ceramic presents excellent thermal and frequency stability within the range of 20–100 °C and 1–100 Hz at 200 kV/cm, respectively. More noteworthy, an ultrafast discharge rate (t0.9 = 23.6 ns) can be achieved in 0.90NN-0.10BLMT ceramic at 120 kV/cm, which is better than that of other lead-free energy storage ceramics. These results show that 0.90NN-0.10BLMT ceramic has broad application prospects in lead-free dielectric ceramic capacitors.
