Rare Metals, Journal Year: 2024, Volume and Issue: unknown
Published: July 31, 2024
Language: Английский
Advanced Functional Materials, Journal Year: 2024, Volume and Issue: 34(25)
Published: Feb. 4, 2024
Abstract Entropy‐stabilized oxide (ESO) research has primarily focused on discovering unprecedented structures, chemistries, and properties in the single‐phase state. However, few studies discuss impacts of entropy stabilization secondary phases functionality particular, electrical conductivity. To address this gap, transport mechanisms canonical ESO rocksalt (Co,Cu,Mg,Ni,Zn)O are assessed as a function phase content. When single‐phase, conducts electrons via Cu + /Cu 2+ small polarons. After 2 h heat treatment, Cu‐rich tenorite form at some grain boundaries (GBs), enhancing interior electronic conductivity by tuning defect chemistry toward higher carrier concentrations. 24 treatment yields all GBs, followed formation anisotropic equiaxed Co‐rich spinel grains, further but slowing across tenorite‐rich GBs. Across samples, total increases (and decreases reversibly) four orders magnitude with heat‐treatment‐induced transformation grains’ concentration lower migration activation energy. This work demonstrates potential to selectively grow grains thereby using microstructure design, nanoscale engineering, paving way develop many novel materials.
Language: Английский
Citations
14
Scientific Reports, Journal Year: 2024, Volume and Issue: 14(1)
Published: March 12, 2024
Abstract Different combinations of monovalent and trivalent A-cations in high-entropy perovskite oxides (HEPOs) were investigated. The multicomponent (A′ 0.2 A″ Ba Sr Ca )TiO 3 = Na + , K Bi 3+ La ) compounds successfully synthesized by solid-state reaction method persisting average cubic phase. cation exhibited distinct effects on local structure, dielectric properties relaxor ferroelectric behavior. Highly dense ceramics (> 95%), high constant (~ 3000), low loss 0.1), characteristics obtained the compound containing . revealed lower constant, higher linear effect was minimal. However, it affected behavior at elevated temperatures conduction temperatures. (K ceramic maintained with P REM suggesting more stable than that (Na Moreover, between these two compounds, homogeneous electrical could be from consisting A-site. This study suggests tuning chemical composition, particularly choosing appropriate combination mono/trivalent cations entropy oxides, effective approach to develop high-performance ferroelectrics desired properties.
Language: Английский
Citations
11
Journal of Energy Storage, Journal Year: 2024, Volume and Issue: 89, P. 111635 - 111635
Published: April 17, 2024
Language: Английский
Citations
9
ACS Applied Electronic Materials, Journal Year: 2024, Volume and Issue: 6(6), P. 4698 - 4708
Published: June 12, 2024
Due to the typical dielectric relaxation behavior of perovskite high-entropy ceramics (HECs), engineering is beneficial for improving energy storage performance and has drawn extensive concern. In this study, oxide (Bi0.2Na0.2Ba0.2Sr0.2Ca0.2)(Ti0.9Nb0.1)O3 (BNCBSTN)-modified 0.45(Bi0.5Na0.5)TiO3-0.55(Sr0.7Bi0.2)TiO3 (BNT-SBT) systems, BNT-SBT-xBNCBSTN (0 ≤ x 0.5) ceramics, were designed prepared using a hydrothermal method. It found that introduction BNCBSTN into BNT-SBT promotes configuration entropy induces strong behavior, thereby greatly performance. addition, grain refinement, increased resistivity, widened band gap are achieved by modification BNCBSTN, leading significant enhancement breakdown electric field (Eb). Consequently, BNT-SBT-0.3BNCBSTN HEC exhibits preeminent recoverable density (Wrec = 6.04 J/cm3) efficiency (η 85%) under an excellent Eb 410 kV/cm as well good temperature frequency stability. The remarkable improvement in indicates modifying ferroelectric system with feasible approach developing capacitors.
Language: Английский
Citations
9
Rare Metals, Journal Year: 2024, Volume and Issue: unknown
Published: July 31, 2024
Language: Английский
Citations
9