Topochemical Synthesis of High-Aspect-Ratio Lead-Free (K, Na)NbO3 Plate-Like Structures

Li Qian Cheng; Mei Feng; Kai Chen

doi:10.4028/www.scientific.net/SSP.281.622

Paper Titles

Polarity Effect and Dielectric Breakdown of Composite Ferroelectric Films as the Dielectric for Electrowetting Systems
p.598

Using Superhydrophobic SU-8 Film as the Dielectric for Electrowetting-on-Dielectric
p.604

Preparation of Low Dielectric Constant Porous Silicon Nitride Ceramics for Radome Application
p.610

BaTiO₃/ Teflon Nanocomposite Ferroelectric Thin Films for Low Voltage Electrowetting Systems
p.616

Topochemical Synthesis of High-Aspect-Ratio Lead-Free (K, Na)NbO₃ Plate-Like Structures
p.622

High Piezoelectric Properties and High T_C in KNN-Based Lead-Free Ceramics Sintered in Reducing Atmosphere
p.628

Effect of Sintering Process on Microstructures and Dielectric Properties of Nb-Doped BaTiO₃-(Bi_0.5Na_0.5)TiO₃ Ceramics for X9R MLCC Applications
p.634

Dielectric Breakdown Strength and Microwave Dielectric Properties of Alumina Ceramics with CaO-SiO₂- MgO, Yb₂O₃and ZrO₂ Additives
p.640

Preparation and Properties of Si₃N₄-BaTiO₃ Composite Ceramics
p.646

HomeSolid State PhenomenaSolid State Phenomena Vol. 281Topochemical Synthesis of High-Aspect-Ratio...

Topochemical Synthesis of High-Aspect-Ratio Lead-Free (K, Na)NbO₃ Plate-Like Structures

Abstract:

Single crystalline lead-free (K, Na)NbO₃ (KNN) nanostructures have attracted much attention for the high piezoelectricity and environmental compatibility. Especially, the plate-like KNN structures are supposed to be utilized in the synthesis of textured KNN-based ceramics. The KNN plate-like templates were prepared by a two-step molten salt reaction. The layered-perovskite Bi_2.5Na_3.5Nb₅O₁₈ (BNN₅) was first prepared by using Bi₂O₃, Nb₂O₅, Na₂CO₃, NaCl as raw materials. The BNN₅ precursors possess high aspect ratio with an average size of 15 - 20 μm in width and 0.5 - 1 μm in thickness. Then Bi element in the BNN₅ was replaced by Na/K through topochemical reaction, and KNN plate-like products which have anisotropic crystal structure were fabricated. It should be emphasized that piezoresponse force microscopy (PFM) was used to confirm three-dimensional (3-D) morphology, while piezoelectric properties of single crystalline KNN platelets were acquired simultaneously. The as-synthesized KNN structures are expected to play an important role in the study of textured KNN ceramics. Meanwhile, the methodology investigated in this paper can also be applied for further fundamental studies on KNN system as well as other lead-free piezoelectric materials.

You might also be interested in these eBooks

View Preview

Info:

Periodical:

Solid State Phenomena (Volume 281)

Pages:

622-627

DOI:

https://doi.org/10.4028/www.scientific.net/SSP.281.622

Citation:

Cite this paper

Online since:

August 2018

Authors:

Li Qian Cheng*, Mei Feng, Kai Chen

Keywords:

(K,Na)NbO₃, PFM, Plate-Like Structures, Topochemical Synthesis

Export:

RIS, BibTeX

Price:

Permissions CCC:

Request Permissions

Permissions PLS:

Request Permissions

Сopyright:

Citation:

* - Corresponding Author

References

[1] S. Shimizu, N. Kumada, K. Nakashima, I. Fujii, D. Tanaka, Microstructure control of barium titanate-potassium niobate solid solution system ceramics by MPB engineering and their piezoelectric properties, Key Eng. Mater. 485 (2011) 89-92.