Growth of dense single crystals of potassium sodium niobate by a combination of solid-state crystal growth and hot pressing

(K0.5Na0.5)NbO3 (KNN) is a potential lead-free replacement for Pb(Zr, Ti)O-3 (PZT) piezoceramics, but its piezoelectric properties are inferior to those of PZT. By growing single crystals of KNN, it may be possible to improve the piezoelectric properties. Recently, single crystals of KNN were grown by the solid-state crystal growth (SSCG) method, but the crystals were very porous. In this paper, a method of growing dense single crystals by SSCG in a hot press will be described. (110)-oriented single seed crystals of KTaO3 were buried in KNN powder, with 0.5 mol% of K4CuNb8O23 added as a sintering aid. After consolidation by uniaxial and isostatic pressing, the tablets were hot pressed in a two-stage treatment. During hot pressing, dense single crystals of KNN grew using the KTaO3 seed crystal as a template. The effect of hot pressing on single crystal growth will be discussed.
Publisher
WILEY-BLACKWELL
Issue Date
2008-05
Language
ENG
Keywords

LEAD-FREE PIEZOCERAMICS; PIEZOELECTRIC PROPERTIES; GRAIN-GROWTH; MICROSTRUCTURAL EVOLUTION; SINTERING AID; CERAMICS; TITANATE; (NA; CUO

Citation

JOURNAL OF THE AMERICAN CERAMIC SOCIETY, v.91, no.5, pp.1503 - 1507

ISSN
0002-7820
DOI
10.1111/j.1551-2916.2008.02324.x
URI
http://hdl.handle.net/10203/87478
Appears in Collection
NE-Journal Papers(저널논문)
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