“…The phase structure in Eu‐NBT‐ x STO thin films for x ≥ 0.3 might be tetragonal symmetry, thus the rhombohedral and tetragonal phase may coexist near x = 0.24, the composition at which the morphotropic phase boundary (MPB) is formed. The MPB composition is close to that in NBT‐STO ceramics …”
The Eu3+‐doped (1 − x)Na0.5Bi0.5TiO3‐xSrTiO3 (Eu‐NBT‐xSTO) thin films were prepared on Pt/Ti/SiO2/Si substrates. Raman analysis reveals that the phase structure may undergo a phase evolution of rhombohedral → rhombohedral + tetragonal (morphotropic phase boundary) → tetragonal with increasing content of STO. The scanning electron microscopy images show that the uniformity and high density of Eu‐NBT‐xSTO films were increased by adding STO, resulting in a pronounced effect on energy storage properties. The ɛ‐T curves confirm that a high phase transition diffuseness of γ = 2.02 ± 0.03 and 1.98 ± 0.03 was achieved in Eu‐NBT‐0.24STO and Eu‐NBT‐0.3STO films, respectively. Furthermore, a large recoverable energy storage density of 31.5 J cm−3 with an efficiency of 64% was obtained in Eu‐NBT‐0.3STO film, which also exhibited good thermal stability in the temperature range between −60°C and 80°C as well as long‐term stability up to 1 × 108 switching cycles. These results suggest that the Eu‐NBT‐xSTO films may be used in the novel and advanced energy storage capacitors.
“…The phase structure in Eu‐NBT‐ x STO thin films for x ≥ 0.3 might be tetragonal symmetry, thus the rhombohedral and tetragonal phase may coexist near x = 0.24, the composition at which the morphotropic phase boundary (MPB) is formed. The MPB composition is close to that in NBT‐STO ceramics …”
The Eu3+‐doped (1 − x)Na0.5Bi0.5TiO3‐xSrTiO3 (Eu‐NBT‐xSTO) thin films were prepared on Pt/Ti/SiO2/Si substrates. Raman analysis reveals that the phase structure may undergo a phase evolution of rhombohedral → rhombohedral + tetragonal (morphotropic phase boundary) → tetragonal with increasing content of STO. The scanning electron microscopy images show that the uniformity and high density of Eu‐NBT‐xSTO films were increased by adding STO, resulting in a pronounced effect on energy storage properties. The ɛ‐T curves confirm that a high phase transition diffuseness of γ = 2.02 ± 0.03 and 1.98 ± 0.03 was achieved in Eu‐NBT‐0.24STO and Eu‐NBT‐0.3STO films, respectively. Furthermore, a large recoverable energy storage density of 31.5 J cm−3 with an efficiency of 64% was obtained in Eu‐NBT‐0.3STO film, which also exhibited good thermal stability in the temperature range between −60°C and 80°C as well as long‐term stability up to 1 × 108 switching cycles. These results suggest that the Eu‐NBT‐xSTO films may be used in the novel and advanced energy storage capacitors.
“…Accordingly, the P m value decreased greatly, resulting in a decrease in W . The energy storage characteristics of some lead‐free ceramic systems are compared in Table . It can be seen that the LTM05 ceramic has very high W and η values, which is attributed to the large P m values, small P r values and high breakdown field strength.…”
A new type of (0.7−x)Bi0.5Na0.5TiO3‐0.3Sr0.7Bi0.2TiO3‐xLaTi0.5Mg0.5O3 (LTM1000x, x = 0.0, 0.005, 0.01, 0.03, 0.05 wt%) lead‐free energy storage ceramic material was prepared by a combining ternary perovskite compounds, and the phase transition, dielectric, and energy storage characteristics were analyzed. It was found that the ceramic materials can achieve a stable dielectric property with a large dielectric constant in a wide temperature range with proper doping. The dielectric constant was stable at 2170 ± 15% in the temperature range of 35‐363°C at LTM05. In addition, the storage energy density was greatly improved to 1.32 J/cm3 with a high‐energy storage efficiency of 75% at the composition. More importantly, the energy storage density exhibited good temperature stability in the measurement range, which was maintained within 5% in the temperature range of 30‐110°C. Particularly, LTM05 show excellent fatigue resistance within 106 fatigue cycles. The results show that the ceramic material is a promising material for temperature‐stable energy storage.
“…For further evaluating energy storage performance of the (1-x)LLBNTZ-xNBN ceramics, the comparison of W
1 and BDS between (1-x)BBNT-xNBN ceramics and other lead-free ceramics in recently reported results are shown in Fig. 9
1, 4, 10, 14, 16, 22, 23, 37, 40, 69–75 . It can be seen that the values of W
1 and BDS for (1-x)LLBNTZ-xNBN ceramics are higher than those of other lead-free ceramics.Figure 8Calculated energy storage density, energy loss density and energy storage efficiency as a function of electric field for the (1-x)LLBNTZ-xNBN ceramics at room temperature.Figure 9Comparison of W
1 and BDS between (1-x)LLBNTZ-xNBN ceramics and other lead-free ceramics.…”
Section: Resultsmentioning
confidence: 99%
“…However, for the sake of environment protection, these lead-containing materials need to be replaced by environment-friendly materials. As an alternative to the toxic lead-containing dielectric materials, Bi 0.5 Na 0.5 TiO 3 (BNT) based ceramics have been extensively studied 13–18 , such as (Bi 0.5 Na 0.5 )TiO 3 -BaTiO 3
19–21 , (Bi 0.5 Na 0.5 )TiO 3 -BaTiO 3 -(K 0.5 Na 0.5 )NbO 3
22 , (Na 0.5 Bi 0.5 )TiO 3 -SrTiO 3
23 and Na 0.5 Bi 0.5 TiO 3 -BaTiO 3 -BiFeO 3
24 . The reason is that BNT belongs to perovskite-type ferroelectric with an A-sites disorder structure and Bi 3+ ion is a promising alternative to Pb 2+ ion due to their similar lone-pair electronic 6
s
2 configuration 1, 25 .…”
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 results indicate that the addition of Na0.73Bi0.09NbO3 (NBN) could decrease the remnant polarization (P
r) and improve the temperature stability of dielectric constant obviously. The working temperature range satisfying TCC
150
°C ≤±15% of this work spans over 400 °C with the compositions of x ≥ 0.06. The maximum energy storage density can be obtained for the sample with x = 0.10 at room temperature, with an energy storage density of 2.04 J/cm3 at 178 kV/cm. In addition, the (1-x)LLBNTZ-xNBN ceramics exhibit excellent energy storage properties over a wide temperature range from room temperature to 90 °C. The values of energy storage density and energy storage efficiency is 0.91 J/cm3 and 79.51%, respectively, for the 0.90LLBNTZ-0.10NBN ceramic at the condition of 100 kV/cm and 90 °C. It can be concluded that the (1-x)LLBNTZ-xNBN ceramics are promising lead-free candidate materials for energy storage devices over a broad temperature range.
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