Enhanced electrical properties of (Bi0.2Na0.2Ba0.2Ca0.2Sr0.2)TiO3 high-entropy ceramics prepared by hydrothermal method

High energy storage performance of lead‐free Nb‐modified (Bi0.2Na0.2Ca0.2Ba0.2Sr0.2)TiO3 high‐entropy ceramics

“…NaOH, BaCl 2 ·2H 2 O, Bi(NO 3 ) 3 ·5H 2 O, Sr(NO 3 ) 2 , CaCl 2 , Ti(C 4 H 9 O) 4 , and Nb 2 O 5 were selected as starting materials. The detailed synthesis procedure has been described in our previous study 13 . Based on a stoichiometric ratio, the raw reagents were weighed, dissolved, and mixed into a suspension.…”

“…Based on our previous research on A‐site disorder (Bi 0.2 Na 0.2 Ca 0.2 Ba 0.2 Sr 0.2 )TiO 3 (BNCBST) HEC, 13 this study focuses on improving the E b and energy storage performance of BNCBST HECs by doping Nb 5+ ion into the B site. It is well known that relaxor ferroelectrics possess typical dielectric relaxation behaviors, which are characterized by a broadening of the dielectric peak, a shift of T m to lower temperatures, and a decrease in the maximum dielectric constant with the increasing of frequency 27 .…”

“…prepared (1− x )(Bi 0.5 Na 0.5 K 0.5 Ba 0.5 Ca 0.5 )TiO 3 ‐ x BaTiO 3 HECs through the solid‐state reaction and as‐prepared ceramics showed dielectric relaxation behavior, achieving a high W rec (2.24 J/cm 3 ) under 140 kV/cm at x = 0.20 12 . In our previous studies, A‐site disorder perovskite (Bi 0.2 Na 0.2 Ca 0.2 Ba 0.2 Sr 0.2 )TiO 3 and [(Bi 0.2 Na 0.2 Ca 0.2 Ba 0.2 Sr 0.2 ) 0.955 La 0.03 ]TiO 3 HECs were synthesized through hydrothermal method and exhibited strong dielectric relaxation behavior and good energy storage properties ( W rec ∼ 2.43 J/cm 3 , E b ∼ 245 kV/cm) 13,14 . These studies successfully took advantages of high entropy effect to obtain relaxor ferroelectrics and enhanced energy storage properties.…”

Mechanochemical synthesis of nanostructured and composite oxide ceramics: From mechanisms to tailored properties

“…Over the past few decades, extensive research has been conducted on methods for preparing oxide ceramic powders, including both traditional and mechanochemical techniques. Traditional approaches such as solid‐phase methods, such as high‐temperature solid‐phase synthesis 7,8 and molten salt methods, 9–11 and liquid‐phase methods such as co‐precipitation, 12–14 sol–gel, 15–18 and hydrothermal methods, 19,20 have been widely studied. However, these traditional methods often require organic solvents or high‐temperature conditions, leading to low reaction efficiency and environmental concerns 21–23 .…”

Enhanced energy‐storage properties in Zr4+‐modified (Bi0.4Ba0.2K0.2Na0.2)TiO3 high‐entropy ceramics

“…This tunability is beneficial for designing and preparing high‐entropy perovskite oxides (HEPOs). Thus far, more than 100 HEPOs have been synthesized 13–25 . However, early research on HEPOs is primarily centered on the synthesis of new materials.…”