Lead-free relaxor-ferroelectric ceramics for high-energy-storage applications
| Autor: | Amjad Ullah, Millicent Appiah, Minghe Cao, Safeer Ahmad Arbab, Muhammad Tahir, Marwa Emmanuel, Abdul Manan, Hanxing Liu, Hua Hao, Atta Ullah, Abdullah Jan, Zhonghua Yao |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Analytical chemistry 02 engineering and technology General Chemistry Dielectric Pulsed power 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Energy storage 0104 chemical sciences law.invention Capacitor chemistry.chemical_compound chemistry law visual_art Electric field Materials Chemistry visual_art.visual_art_medium Strontium titanate Polar Ceramic 0210 nano-technology |
| Zdroj: | Journal of Materials Chemistry C. 8:8962-8970 |
| ISSN: | 2050-7534 2050-7526 |
| DOI: | 10.1039/d0tc01786h |
| Popis: | Relaxor-ferroelectric ceramics capacitors have been in the front lines of investigations aimed at optimizing energy density due to their high Pmax, suppressed Pr, and high BDS levels, attributed to their highly dynamic polar nano-regions. A set of (1 − x)SrTiO3–x[0.88BaTiO3–0.12Bi(Li0.5Ta0.5)O3] ceramics (x = 0, 20, 40, 60 and 80 mol%), abbreviated as (1 − x)ST–x(BT–BLT), was designed and fabricated via a solid-state reaction route. A striking energy-storage density of 2.24 J cm−3, coupled with a high efficiency of η = 81% at 300 kV cm−1, was measured for these (1 − x)ST–x(BT–BLT) ceramics. The incorporation of BT–BLT ceramics was found to dramatically transform the paraelectric state of strontium titanate into the relaxor-ferroelectric state, by introducing broad relaxor behavior. The energy storage properties of the ceramic with x = 60 mol% showed outstanding stability in frequency (10–100 Hz) and temperature (20–120 °C), with minimal variation of (±≤0.5%), over the course of 105 cycles. Moreover, under various electric fields, rapid charge and discharge (≤1.5 μs) was also observed for this x = 60 mol% ceramic. Most significantly, the outcomes of this study are expected to provide a standard for other emerging lead-free dielectric ceramics displaying very good energy-storage properties and excellent electric field endurance, which are of pragmatic importance for cutting-edge pulsed power technology. |
| Databáze: | OpenAIRE |
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