Grain-Size-Controlled (Li,Na,K)NbO3 Ceramics Using Powder Source Classified by Centrifugal Separator
- 1 September 2012
- journal article
- Published by IOP Publishing in Japanese Journal of Applied Physics
- Vol. 51 (9S1), 09LD06
- https://doi.org/10.1143/jjap.51.09ld06
Abstract
A model experiment on the grain-size-related dielectric and ferroelectric properties of lead-free Li0.04(Na0.50K0.50)0.96NbO3 piezoelectric ceramics has been carried out. Firstly, the size classification of calcined powders was achieved by a wet-type centrifugal separation technique to obtain size-classified powders with different mean particle sizes. Then, spark plasma sintering (SPS) under an identical condition at 960 °C for 10 min at a pressure of 80 MPa was performed for the size-classified powder sources to synthesize dense ceramics and control their mean grain sizes so that they ranged from 500 nm to approximately 5 µm. The results clearly allowed the distinguishing of different dielectric and ferroelectric properties on the basis of grain size. By increasing the grain size from 0.5 to 2.8 µm, the remanent polarization P r gradually increases from 4.2 to 16.8 µC/cm2, but a further increase in grain size to 4.8 µm causes a decrease in P r to 9.2 µC/cm2, while the coercive field E c tends to increase with decreasing grain size. Our findings and the new technique to control grain size may stimulate further systematic investigation of grain-size-related properties for the development of lead-free alkali niobate piezoelectric ceramics showing excellent electrical properties.Keywords
This publication has 30 references indexed in Scilit:
- Structural Characterization of Na0.5K0.5NbO3 Ceramic Particles Classified by Centrifugal SeparatorJapanese Journal of Applied Physics, 2011
- Pressure-Dependent Raman Scattering Spectrum of Piezoelectric (Li,Na,K)NbO3 Lead-Free CeramicsJapanese Journal of Applied Physics, 2010
- Low‐Temperature Sintering of Dense (Na,K)NbO3 Piezoelectric Ceramics Using the Citrate Precursor TechniqueJournal of the American Ceramic Society, 2010
- Domain Size Effect on Dielectric Properties of Barium Titanate CeramicsJapanese Journal of Applied Physics, 2008
- Microstructural Design of Dielectrics for Ni-MLCC with Ultra-thin Active LayersJournal of the Ceramic Society of Japan, 2007
- Raman Scattering Study of Piezoelectric (Na0.5K0.5)NbO3-LiNbO3 CeramicsJapanese Journal of Applied Physics, 2005
- Preparation of nm-Sized Barium Titanate Fine Particles and Their Powder Dielectric PropertiesJapanese Journal of Applied Physics, 2003
- Critical size and anomalous lattice expansion in nanocrystallineparticlesPhysical Review B, 2000
- Dielectric Properties and Ferroelectric Domain of BaTiO3 PowdersJapanese Journal of Applied Physics, 1993
- Effect of Firing Cycle on Structure and Some Dielectric and Piezoelectric Properties of Barium Titanate CeramicsJournal of the American Ceramic Society, 1955