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Enhancement in the physical properties of K0.5Na0.5NbO3 ceramics by the addition of 0.5 Li2O-0.5K(2)O-2B(2)O(3) glass

Ponraj, Bharathi and Varma, K B R (2016) Enhancement in the physical properties of K0.5Na0.5NbO3 ceramics by the addition of 0.5 Li2O-0.5K(2)O-2B(2)O(3) glass. In: INTEGRATED FERROELECTRICS, 176 (1). pp. 257-267.

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Official URL: http://dx.doi.org/10.1080/10584587.2016.1252659

Abstract

The addition of powdered 0.5 Li2O-0.5K(2)O-2B(2)O(3) (LKBO) glass (0.5 to 2wt%) to potassium sodium niobate, K0.5Na0.5NbO3 (KNN) powder facilitated higher densification which resulted in improved physical properties that include dielectric, piezoelectric and ferroelectric. The required polycrystalline powders of KNN were synthesized through solid-state reaction route, while LKBO glass was obtained via the conventional melt-quenching technique. Pulverized glass was added to KNN powders in different wt% and compacted at room temperature and these were sintered around 1100 degrees C. Indeed the addition of optimum amount (1wt %) of LKBO glass to KNN ceramics facilitated lowering of sintering temperature accompanied by larger grains (8 mu m) with improved density. The dielectric constant (E-r) measured at room temperature was 475 (at 10kHz), whereas it was only 199 for the LKBO glass free KNN. The piezoelectric coefficient (d(33)) was found to be 130 pC/N for 1 wt% LKBO added glass, which was much higher than that of pure KNN ceramics (85pC/N). Indeed, the LKBO glass added samples did exhibit well saturated P versus E hysteresis loops at room temperature. Though there was no particular trend observed in the variation of P-r with the increase in glass content, the P-r values were higher than that obtained for KNN ceramics. The improved physical properties of KNN ceramics encountered in these studies were primarily attributed to enhancement in density and grain size.

Item Type: Journal Article
Additional Information: Copy right for this article belongs to the TAYLOR & FRANCIS LTD, 2-4 PARK SQUARE, MILTON PARK, ABINGDON OR14 4RN, OXON, ENGLAND
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Depositing User: Id for Latest eprints
Date Deposited: 10 Feb 2017 05:08
Last Modified: 10 Feb 2017 05:08
URI: http://eprints.iisc.ac.in/id/eprint/56203

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