In:
Journal of the American Ceramic Society, Wiley, Vol. 91, No. 7 ( 2008-07), p. 2409-2411
Abstract:
The objective of this work was to lower the sintering temperature of K 0.5 Na 0.5 NbO 3 (KNN) without reducing its piezoelectric properties. The KNN was sintered using 0.5, 1, 2, and 4 mass% of (K, Na)‐germanate. The influence of the novel sintering aid, based on alkaline germanate with a melting point near 700°C, on the sintering, density, and piezoelectric properties of KNN is presented. The alkaline‐germanate‐modified KNN ceramics reach up to 96% of theoretical density at sintering temperatures as low as 1000°C, which is approximately 100°C less than the sintering temperature of pure KNN. The relative dielectric permittivity (ɛ/ɛ 0 ) and losses (tanδ), measured at 10 kHz, the piezo d 33 coefficient, the electromechanical coupling and mechanical quality factors ( k p , k t , Q m ) of KNN modified with 1 mass% of alkaline germanate are 397, 0.02, 120 pC/N, 0.40, 0.44, and 77, respectively. These values are comparable to the best values obtained for KNN ceramics sintered above 1100°C.
Type of Medium:
Online Resource
ISSN:
0002-7820
,
1551-2916
DOI:
10.1111/jace.2008.91.issue-7
DOI:
10.1111/j.1551-2916.2008.02447.x
Language:
English
Publisher:
Wiley
Publication Date:
2008
detail.hit.zdb_id:
2008170-4
detail.hit.zdb_id:
219232-9
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