Effects Of Geo2 Addition On Sintering And Properties Of (K0.5Na0.5)Nbo3 Ceramics

Abstract

Lead-free (K0.5Na0.5)NbO3 (KNN) piezoelectric ceramics doped with different amounts of GeO2 were prepared and characterized. GeO2 was found to effectively improve the sinterability and piezoelectric properties of the material. The improvement in the sinterability is ascribed to the formation of a liquid phase, which decreased the sintering temperature from 1080°C to 1010°C. The improvement in the properties is attributed to the replacement of Nb5+ with Ge4+ to form acceptor dopants. The following optimized properties were obtained from the KNN ceramic with 0.75 wt% GeO2: piezoelectric constant (d33) = 126 pC/N, planar electromechanical coupling coefficient (kp) = 42.8%, mechanical quality factor (Qm) = 140, and dielectric loss (tanδ) = 3.8%.

Publication Date

5-1-2016

Publication Title

Journal of the American Ceramic Society

Volume

99

Issue

5

Number of Pages

1681-1686

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1111/jace.14162

Socpus ID

84977871225 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84977871225

This document is currently not available here.

Share

COinS