K 0.5 Na 0.5 NbO 3 ‐Based Lead‐Free Transparent Electro‐Optic Ceramics Prepared by Pressureless Sintering

Transparent lead‐free electro‐optic (EO) ceramics ( K 0.5 Na 0.5 ) 0.9 Li 0.1 Nb 0.9 Bi 0.1 O 3 have been fabricated by pressureless sintering. The ceramics have a fine‐grained structure and cubic‐like symmetry. The comodification with Li and Bi induces a diffuse phase transition, causing the cerami...

Full description

Saved in:
Bibliographic Details
Published in:Journal of the American Ceramic Society 2013-11, Vol.96 (11), p.3557-3562
Main Authors: Li, Faliang, Kwok, Kin‐Wing
Format: Article
Language:English
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Transparent lead‐free electro‐optic (EO) ceramics ( K 0.5 Na 0.5 ) 0.9 Li 0.1 Nb 0.9 Bi 0.1 O 3 have been fabricated by pressureless sintering. The ceramics have a fine‐grained structure and cubic‐like symmetry. The comodification with Li and Bi induces a diffuse phase transition, causing the ceramics become relaxor‐like and contain polar nanoregions. Our results reveal that excess Bi 2 O 3 can further enhance the changes in the crystal structure and dielectric behavior of the ceramics, causing them become more cubic‐like and more relaxor‐like, respectively. These can reduce the light scattering arisen from birefringence and domain walls, and thus improving the optical properties. For the ceramics added with 4 and 6 mol% excess Bi 2 O 3 , the optical transmittance reaches a high value of 60%–70% in the near‐infrared region. The ceramics also exhibits a good linear EO response, giving an effective EO coefficient of 30–40 pm/V.
ISSN:0002-7820
1551-2916
DOI:10.1111/jace.12539