Journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 40, Issue 6, Pages 2331-2337Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2020.01.029
Keywords
Transparent ceramics; Piezoelectric properties; Grain size; Grain boundary; Transmittance
Categories
Funding
- National Science Foundation of China (NSFC) [51607108, 51872177, 51572163, 51577111]
- Fundamental Research Funds for the Central Universities [GK201903017, GK201802007, GK201701011]
- Information Materials and Devices Research Center of the Shanghai Institute of Ceramics of the Chinese Academy of Sciences (SICCAS) [KLIFMD-2015-04]
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Transparent ceramics with good electrical performance have recently drawn broad interest as promising multifunctional materials. Here, we report that a superior transmittance (T = 75 % at 2000 nm) and good piezoelectricity (d(33) similar to 150 pC/N) can be simultaneously realized in 0.93K(0.5)Na(0.5)NbO(3)-0.07SrZrO(3) (KNN-SZ) ceramics by Li2O regulation. The effect of Li 2 0 regulation has two parts: first, the presence of Li2O facilitates the grain growth of KNN-SZ, considering that it melts at a relatively low temperature as a proper sintering aid; second, the introduced Li(+ )causes local lattice distortion, resulting in the coexistence of orthogonal and tetragonal (O-T) phases. The enlarged grains reduce the light scattering by grain boundaries for a higher optical transmittance; meanwhile, large grains stand as a prerequisite for the macroscopic domain structure favoured for decent piezoelectricity, which could also be partly caused by the coexistence of O-T phases. We believe that these findings might make KNN-based ceramics a preferable candidate for optoelectronic devices.
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