Enhanced Energy Storage Performance and Efficiency in Bi<sub>0.5</sub>(Na<sub>0.8</sub>K<sub>0.2</sub>)<sub>0.5</sub>TiO<sub>3</sub>-Bi<sub>0.2</sub>Sr<sub>0.7</sub>TiO<sub>3</sub> Relaxor Ferroelectric Ceramics via Domain Engineering
Dielectric materials are highly desired for pulsed power capacitors due to their ultra-fast charge-discharge rate and excellent fatigue behavior. Nevertheless, the low energy storage density caused by the low breakdown strength has been the main challenge for practical applications. Herein, we repor...
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| Online Access: | https://www.mdpi.com/1996-1944/16/14/4912 |
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| author | Srinivas Pattipaka Hyunsu Choi Yeseul Lim Kwi-Il Park Kyeongwoon Chung Geon-Tae Hwang |
| author_facet | Srinivas Pattipaka Hyunsu Choi Yeseul Lim Kwi-Il Park Kyeongwoon Chung Geon-Tae Hwang |
| author_sort | Srinivas Pattipaka |
| collection | DOAJ |
| description | Dielectric materials are highly desired for pulsed power capacitors due to their ultra-fast charge-discharge rate and excellent fatigue behavior. Nevertheless, the low energy storage density caused by the low breakdown strength has been the main challenge for practical applications. Herein, we report the electric energy storage properties of (1 − <i>x</i>) Bi<sub>0.5</sub>(Na<sub>0.8</sub>K<sub>0.2</sub>)<sub>0.5</sub>TiO<sub>3</sub>-<i>x</i>Bi<sub>0.2</sub>Sr<sub>0.7</sub>TiO<sub>3</sub> (BNKT-BST; <i>x</i> = 0.15–0.50) relaxor ferroelectric ceramics that are enhanced via a domain engineering method. A rhombohedral-tetragonal phase, the formation of highly dynamic PNRs, and a dense microstructure are confirmed from XRD, Raman vibrational spectra, and microscopic investigations. The relative dielectric permittivity (2664 at 1 kHz) and loss factor (0.058) were gradually improved with BST (<i>x</i> = 0.45). The incorporation of BST into BNKT can disturb the long-range ferroelectric order, lowering the dielectric maximum temperature <i>T<sub>m</sub></i> and inducing the formation of highly dynamic polar nano-regions. In addition, the <i>T<sub>m</sub></i> shifts toward a high temperature with frequency and a diffuse phase transition, indicating relaxor ferroelectric characteristics of BNKT-BST ceramics, which is confirmed by the modified Curie-Weiss law. The rhombohedral-tetragonal phase, fine grain size, and lowered <i>T<sub>m</sub></i> with relaxor properties synergistically contribute to a high <i>P<sub>max</sub></i> and low <i>P<sub>r</sub></i>, improving the breakdown strength with BST and resulting in a high recoverable energy density <i>W<sub>rec</sub></i> of 0.81 J/cm<sup>3</sup> and a high energy efficiency <i>η</i> of 86.95% at 90 kV/cm for <i>x</i> = 0.45. |
| first_indexed | 2024-03-11T00:52:50Z |
| format | Article |
| id | doaj.art-6310170ab0e041ebbc2377ecffa5227e |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-11T00:52:50Z |
| publishDate | 2023-07-01 |
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| spelling | doaj.art-6310170ab0e041ebbc2377ecffa5227e2023-11-18T20:14:57ZengMDPI AGMaterials1996-19442023-07-011614491210.3390/ma16144912Enhanced Energy Storage Performance and Efficiency in Bi<sub>0.5</sub>(Na<sub>0.8</sub>K<sub>0.2</sub>)<sub>0.5</sub>TiO<sub>3</sub>-Bi<sub>0.2</sub>Sr<sub>0.7</sub>TiO<sub>3</sub> Relaxor Ferroelectric Ceramics via Domain EngineeringSrinivas Pattipaka0Hyunsu Choi1Yeseul Lim2Kwi-Il Park3Kyeongwoon Chung4Geon-Tae Hwang5Department of Materials Science and Engineering, Pukyong National University, 45 Yongso-ro, Nam-Gu, Busan 48513, Republic of KoreaDepartment of Materials Science and Engineering, Pukyong National University, 45 Yongso-ro, Nam-Gu, Busan 48513, Republic of KoreaDepartment of Materials Science and Engineering, Pukyong National University, 45 Yongso-ro, Nam-Gu, Busan 48513, Republic of KoreaSchool of Materials Science and Engineering, Kyungpook National University, 80 Daehak-ro, Buk-Gu, Daegu 41566, Republic of KoreaDepartment of Biofibers and Biomaterials Science, Kyungpook National University, Daegu 41566, Republic of KoreaDepartment of Materials Science and Engineering, Pukyong National University, 45 Yongso-ro, Nam-Gu, Busan 48513, Republic of KoreaDielectric materials are highly desired for pulsed power capacitors due to their ultra-fast charge-discharge rate and excellent fatigue behavior. Nevertheless, the low energy storage density caused by the low breakdown strength has been the main challenge for practical applications. Herein, we report the electric energy storage properties of (1 − <i>x</i>) Bi<sub>0.5</sub>(Na<sub>0.8</sub>K<sub>0.2</sub>)<sub>0.5</sub>TiO<sub>3</sub>-<i>x</i>Bi<sub>0.2</sub>Sr<sub>0.7</sub>TiO<sub>3</sub> (BNKT-BST; <i>x</i> = 0.15–0.50) relaxor ferroelectric ceramics that are enhanced via a domain engineering method. A rhombohedral-tetragonal phase, the formation of highly dynamic PNRs, and a dense microstructure are confirmed from XRD, Raman vibrational spectra, and microscopic investigations. The relative dielectric permittivity (2664 at 1 kHz) and loss factor (0.058) were gradually improved with BST (<i>x</i> = 0.45). The incorporation of BST into BNKT can disturb the long-range ferroelectric order, lowering the dielectric maximum temperature <i>T<sub>m</sub></i> and inducing the formation of highly dynamic polar nano-regions. In addition, the <i>T<sub>m</sub></i> shifts toward a high temperature with frequency and a diffuse phase transition, indicating relaxor ferroelectric characteristics of BNKT-BST ceramics, which is confirmed by the modified Curie-Weiss law. The rhombohedral-tetragonal phase, fine grain size, and lowered <i>T<sub>m</sub></i> with relaxor properties synergistically contribute to a high <i>P<sub>max</sub></i> and low <i>P<sub>r</sub></i>, improving the breakdown strength with BST and resulting in a high recoverable energy density <i>W<sub>rec</sub></i> of 0.81 J/cm<sup>3</sup> and a high energy efficiency <i>η</i> of 86.95% at 90 kV/cm for <i>x</i> = 0.45.https://www.mdpi.com/1996-1944/16/14/4912lead-free ceramic capacitorsdielectricrelaxor ferroelectricdomain engineeringenergy storage |
| spellingShingle | Srinivas Pattipaka Hyunsu Choi Yeseul Lim Kwi-Il Park Kyeongwoon Chung Geon-Tae Hwang Enhanced Energy Storage Performance and Efficiency in Bi<sub>0.5</sub>(Na<sub>0.8</sub>K<sub>0.2</sub>)<sub>0.5</sub>TiO<sub>3</sub>-Bi<sub>0.2</sub>Sr<sub>0.7</sub>TiO<sub>3</sub> Relaxor Ferroelectric Ceramics via Domain Engineering Materials lead-free ceramic capacitors dielectric relaxor ferroelectric domain engineering energy storage |
| title | Enhanced Energy Storage Performance and Efficiency in Bi<sub>0.5</sub>(Na<sub>0.8</sub>K<sub>0.2</sub>)<sub>0.5</sub>TiO<sub>3</sub>-Bi<sub>0.2</sub>Sr<sub>0.7</sub>TiO<sub>3</sub> Relaxor Ferroelectric Ceramics via Domain Engineering |
| title_full | Enhanced Energy Storage Performance and Efficiency in Bi<sub>0.5</sub>(Na<sub>0.8</sub>K<sub>0.2</sub>)<sub>0.5</sub>TiO<sub>3</sub>-Bi<sub>0.2</sub>Sr<sub>0.7</sub>TiO<sub>3</sub> Relaxor Ferroelectric Ceramics via Domain Engineering |
| title_fullStr | Enhanced Energy Storage Performance and Efficiency in Bi<sub>0.5</sub>(Na<sub>0.8</sub>K<sub>0.2</sub>)<sub>0.5</sub>TiO<sub>3</sub>-Bi<sub>0.2</sub>Sr<sub>0.7</sub>TiO<sub>3</sub> Relaxor Ferroelectric Ceramics via Domain Engineering |
| title_full_unstemmed | Enhanced Energy Storage Performance and Efficiency in Bi<sub>0.5</sub>(Na<sub>0.8</sub>K<sub>0.2</sub>)<sub>0.5</sub>TiO<sub>3</sub>-Bi<sub>0.2</sub>Sr<sub>0.7</sub>TiO<sub>3</sub> Relaxor Ferroelectric Ceramics via Domain Engineering |
| title_short | Enhanced Energy Storage Performance and Efficiency in Bi<sub>0.5</sub>(Na<sub>0.8</sub>K<sub>0.2</sub>)<sub>0.5</sub>TiO<sub>3</sub>-Bi<sub>0.2</sub>Sr<sub>0.7</sub>TiO<sub>3</sub> Relaxor Ferroelectric Ceramics via Domain Engineering |
| title_sort | enhanced energy storage performance and efficiency in bi sub 0 5 sub na sub 0 8 sub k sub 0 2 sub sub 0 5 sub tio sub 3 sub bi sub 0 2 sub sr sub 0 7 sub tio sub 3 sub relaxor ferroelectric ceramics via domain engineering |
| topic | lead-free ceramic capacitors dielectric relaxor ferroelectric domain engineering energy storage |
| url | https://www.mdpi.com/1996-1944/16/14/4912 |
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