Lead‐free (K,Na)NbO3‐based ceramics with high optical transparency and large energy storage ability

Highly transparent lead‐free (1‐x)K0.5Na0.5NbO3–xSr(Zn1/3Nb2/3)O3 (KNN–xSZN) ferroelectric ceramics have been synthesized via a conventional pressureless sintering method. All samples are optically clear, showing high transmittance in the visible and near‐infrared regions (~70% and ~80% at 0.5 mm of...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 2018-06, Vol.101 (6), p.2321-2329
Main Authors: Chai, Qizhen, Yang, Dong, Zhao, Xumei, Chao, Xiaolian, Yang, Zupei
Format: Article
Language:English
Subjects:
Ceramics
energy harvesting
Energy storage
Ferroelectric materials
Ferroelectricity
lead‐free ceramics
Loose powder sintering
Microstructure
phase transformations
Phase transitions
Relaxors
Solid phases
Transmittance
transparent ceramics
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Summary:Highly transparent lead‐free (1‐x)K0.5Na0.5NbO3–xSr(Zn1/3Nb2/3)O3 (KNN–xSZN) ferroelectric ceramics have been synthesized via a conventional pressureless sintering method. All samples are optically clear, showing high transmittance in the visible and near‐infrared regions (~70% and ~80% at 0.5 mm of thickness, respectively). This exceptionally good transmittance is due to the pseudo‐cubic phase structure as well as the dense and fine‐grained microstructure. In addition, a high energy storage density of 3.0 J/cm3 has been achieved for the 0.94K0.5Na0.5NbO3–0.06Sr(Zn1/3Nb2/3)O3 ceramics with submicron‐sized grains (~136 nm). The main reason is likely to be the typical relaxor‐like behavior characterized by diffuse phase transition, in addition to the dense and fine‐grained microstructure. This study demonstrates that the 0.94K0.5Na0.5NbO3–0.06Sr(Zn1/3Nb2/3)O3 ceramic is a promising candidate of lead‐free transparent ferroelectric ceramics for new areas beyond transparent electronic device applications.
ISSN:0002-7820
1551-2916
DOI:10.1111/jace.15392