Dielectric Temperature Stability and Enhanced Energy-Storage Performance of Sr<sub>0.4</sub>Ba<sub>0.6</sub>(Zr<sub>0.2</sub>Ti<sub>0.2</sub>Sn<sub>0.2</sub>Ta<sub>0.2</sub>Nb<sub>0.2</sub>)<sub>2</sub>O<sub>6</sub> High-Entropy Ferroelectric Ceramics
In this research, we employed a high-entropy approach in tungsten-bronze-structured ferroelectric ceramics, preparing Sr<sub>0.4</sub>Ba<sub>0.6</sub>(Zr<sub>0.2</sub>Ti<sub>0.2</sub>Sn<sub>0.2</sub>Ta<sub>0.2</sub>Nb<sub>...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2024-12-01
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| Series: | Crystals |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2073-4352/15/1/26 |
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| Summary: | In this research, we employed a high-entropy approach in tungsten-bronze-structured ferroelectric ceramics, preparing Sr<sub>0.4</sub>Ba<sub>0.6</sub>(Zr<sub>0.2</sub>Ti<sub>0.2</sub>Sn<sub>0.2</sub>Ta<sub>0.2</sub>Nb<sub>0.2</sub>)<sub>2</sub> (denoted as SBN40-H) ceramics through the traditional solid-state reaction technique. By utilizing the high-entropy approach, the resulting SBN40-H ceramics demonstrated extremely fine grains, averaging 0.58 μm in size. Furthermore, these ceramics possessed a high bandgap of 3.35 eV, which, when combined with the small grain size, contributed to a remarkable breakdown strength of 570.01 kV/cm. The dielectric characteristics demonstrated typical relaxation behavior and outstanding temperature stability, with a capacitance temperature coefficient (TCC) of less than 5% within the temperature range of 111–317 °C. Additionally, the SBN40-H ceramics exhibit slim P–E loops with negligible hysteresis, which is considered to be related to the existence of weakly coupled relaxors. This results in exceptional overall energy-storage properties in the SBN40-H ceramics, exhibiting a notable recoverable energy density (<i>W</i><sub>rec</sub>) of 2.68 J/cm<sup>3</sup> and an efficiency (<i>η</i>) of 93.7% at 390 kV/cm, and finally achieving a remarkable temperature stability in terms of energy-storage performance with variations in <i>W</i><sub>rec</sub> and <i>η</i> being less than 3.5% and 4.4% from 25 to 150 °C. It is worth noting that the high-entropy approach is highly effective in reducing grain size, increasing the breakdown field strength and enhancing the dielectric temperature stability of tungsten-bronze-structured ferroelectric ceramics. |
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| ISSN: | 2073-4352 |