Evolution of the electrical properties of K0.5Bi0.5TiO3 as a result of prolonged sintering. Issue 10 (September 2015)

• Record Type: Journal Article
• Authors: König, J.; Suvorov, D.
• Is Part Of: Journal of the European Ceramic Society. Volume 35:Issue 10(2015:Oct.)
• Page Start: 2791
• Page End: 2799
• Publication Date: 2015-09
• Subjects: Ceramic materials -- Periodicals; Composite materials -- Periodicals; Matériaux céramiques -- Périodiques; Composites -- Périodiques; Ceramic materials; Composite materials; Periodicals; Electronic journals; 666.05
• DOI: 10.1016/j.jeurceramsoc.2015.04.003
• Languages: English
• ISSNs: 0955-2219

Abstract

<abstract abstract-type="author" id="abs0005"> <title id="sect0005">Abstract</title> <sec> <p id="spar0005">Lead-free piezoelectrics are materials exhibiting great potential, particularly because of their extended strains under high fields. However, the reported electrical properties remain inconsistent due to difficulties related to sample preparation. Here, we describe peculiarities of the synthesis procedure and their influence on the electrical properties of K_0.5Bi_0.5TiO₃ ceramics. This synthesis is characterized by the formation of K- and Bi-rich secondary phases and a reaction with humidity, which has a strong impact on the dielectric, ferroelectric and piezoelectric properties. These are very much improved after prolonged sintering, ascribed to the elimination of the hygroscopic K₂O-rich phase. This is reflected in a higher resistivity, density and grain size. The electrical properties are improved in terms of a decrease in the dielectric losses, a two-fold increase in the permittivity value at the maximum, an increase in the remanent polarization to 29 μC/cm², and an increase in the small signal <italic>d</italic>₃₃ value from 40 to 120 pC/N.</p> </sec> </abstract>