Journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 41, Issue 4, Pages 2979-2985Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2020.11.030
Keywords
High entropy; Perovskite; Relaxor-like ferroelectrics; Low loss; Nanodomains
Categories
Funding
- EPSRC (MASSIVE) [EP/L017695/1]
- China Scholarship Council (CSC) [APVV-19-0369, VEGA 2/0082/17]
- International Cooperation Foundation of Shanaxi Province [2020KW-032]
- EPSRC [EP/L017695/1] Funding Source: UKRI
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High entropy perovskites show great potential as relaxor-like ferroelectrics, with the ability to tune their properties for different applications while maintaining low loss and short relaxation times.
Relaxor ferroelectric ceramics are good candidates for capacitor, sensor and actuator applications because of their high dielectric permittivity, high piezoelectric constant and high value of field induced strain, respectively. However, their dielectric loss is usually relatively high, which is a problem for actual applications. The introduction of the high entropy concept opens up the possibility of developing new multi-element relaxor-like ferroelectric materials with short-range ordered polar structures having short relaxation times to decrease their loss. Here we present a new high entropy A-site disordered perovskite (Pb0.25Ba0.25Sr0.25Ca0.25)TiO3 relaxor-like ferroelectric. Moreover, the ceramic has low loss (<0.015) from room temperature to 125 degrees C. The relaxor-like nature of the material is proved by dielectric and ferroelectric measurements. This work demonstrates the great potential of high entropy perovskites as relaxor-like ferroelectrics with a wide compositional window for tuning their properties for different applications.
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