TY - JOUR
T1 - Structure, dielectric, and relaxor properties of BaTiO3-modified high-entropy (Bi0.2Na0.2K0.2Ba0.2Ca0.2)TiO3 ceramics for energy storage applications
AU - Liu, Jia
AU - Ma, Cuiying
AU - Zhao, Xing
AU - Ren, Ke
AU - Zhang, Ruiying
AU - Shang, Furong
AU - Du, Huiling
AU - Wang, Yiguang
N1 - Publisher Copyright:
© 2023 Elsevier B.V.
PY - 2023/6/25
Y1 - 2023/6/25
N2 - High-entropy (1−x)Bi0.5Na0.5K0.5Ba0.5Ca0.5TiO3-xBaTiO3 (BNKBCT-BT, x = 0.02, 0.06, 0.10, 0.14 and 0.20) ceramics are successfully prepared via the solid-state reaction method. The XRD and Raman analyses reveal that all samples exhibit a pseudo-cubic phase structure. With increasing x, the a is gradually increased, resulting in the expansion of unit cell volume. A strong frequency dispersion appeared around Tm, demonstrating that the as-prepared ceramics is a relaxor ferroelectric. Owing to the increase in the degree of lattice disorder, as well as relaxation and thermal evolution of PUs, the as-prepared ceramics exhibit a broad relaxor behavior. The ΔP is effectively increased by doping BT, which is conducive to achieving excellent energy storage properties. Moreover, Wrec of all samples is more than 1.31 J/cm3 and, at x = 0.20, Wrec reaches the maximum value of 2.24 J/cm3 at 140 kV/cm. These results indicate that high-entropy (1−x)BNKBCT-xBT ceramics are promising materials for energy storage applications.
AB - High-entropy (1−x)Bi0.5Na0.5K0.5Ba0.5Ca0.5TiO3-xBaTiO3 (BNKBCT-BT, x = 0.02, 0.06, 0.10, 0.14 and 0.20) ceramics are successfully prepared via the solid-state reaction method. The XRD and Raman analyses reveal that all samples exhibit a pseudo-cubic phase structure. With increasing x, the a is gradually increased, resulting in the expansion of unit cell volume. A strong frequency dispersion appeared around Tm, demonstrating that the as-prepared ceramics is a relaxor ferroelectric. Owing to the increase in the degree of lattice disorder, as well as relaxation and thermal evolution of PUs, the as-prepared ceramics exhibit a broad relaxor behavior. The ΔP is effectively increased by doping BT, which is conducive to achieving excellent energy storage properties. Moreover, Wrec of all samples is more than 1.31 J/cm3 and, at x = 0.20, Wrec reaches the maximum value of 2.24 J/cm3 at 140 kV/cm. These results indicate that high-entropy (1−x)BNKBCT-xBT ceramics are promising materials for energy storage applications.
KW - Dielectric properties
KW - Energy storage materials
KW - High-entropy ceramics
KW - Perovskite structure
KW - Relaxor properties
UR - https://www.scopus.com/pages/publications/85149888498
U2 - 10.1016/j.jallcom.2023.169626
DO - 10.1016/j.jallcom.2023.169626
M3 - Article
AN - SCOPUS:85149888498
SN - 0925-8388
VL - 947
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
M1 - 169626
ER -