Effects of K 4 CuNb 8 O 23 and GeO 2 addition on microstructure and piezoelectric properties in KNbO 3 ceramics
Abstract A combined additives study of lead-free KNbO 3 (KN) ceramics in the solid-state reaction was performed to improve the mechanical quality factor ( Q m ) for high power piezoelectric applications. Improved Q m values of 1137 and 1241 were confirmed in KN specimens with addition of 1.0 mol% K...
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| Published in | Japanese Journal of Applied Physics Vol. 58; no. SL; p. SLLD03 |
|---|---|
| Main Authors | , , |
| Format | Journal Article |
| Language | English |
| Published |
01.11.2019
|
| Online Access | Get full text |
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| Summary: | Abstract
A combined additives study of lead-free KNbO
3
(KN) ceramics in the solid-state reaction was performed to improve the mechanical quality factor (
Q
m
) for high power piezoelectric applications. Improved
Q
m
values of 1137 and 1241 were confirmed in KN specimens with addition of 1.0 mol% K
4
CuNb
8
O
23
(KCN) and 1.0 mol% KCN + 0.5 wt% GeO
2
, respectively. It is important for achievement of the higher
Q
m
in KN systems to control the composition of the Cu segregated phase. In this study, the Cu segregated phase which was necessary to improve the
Q
m
resulted from decomposition of the KCN compound during the sintering. Co-doping of KCN and GeO
2
to KN specimens has a remarkable effect in suppressing the deliquescence accompanying KCN addition and improvement of the
Q
m
without significant deterioration of the electromechanical coupling factor
k
31
. |
|---|---|
| ISSN: | 0021-4922 1347-4065 |
| DOI: | 10.7567/1347-4065/ab3627 |