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Enhanced piezoelectric properties of (Bi,Na)TiO 3 –(Bi,K)TiO 3 ceramics prepared by two‐step sintering process
Author(s) -
Lee Gunhyun,
Ji JaeHoon,
Koh JungHyuk
Publication year - 2017
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/ijac.12798
Subject(s) - sintering , materials science , piezoelectricity , ceramic , dielectric , fabrication , grain size , piezoelectric coefficient , composite material , optoelectronics , medicine , alternative medicine , pathology
Abstract To enhance the piezoelectric properties and lower the sintering temperature of lead‐free (Bi,Na) TiO 3 ‐(Bi,K) TiO 3 ceramics, two‐step sintering process was employed and investigated. As a representative lead‐free piezoelectric materials, (Bi,Na) TiO 3 ‐(Bi,K) TiO 3 has been selected for the two‐step sintering process. The two‐step sintering process can be the advisable fabrication process, especially for the case of volatile materials were contained. The two‐step sintering process can also minimize the evaporation of volatile components. By lowering the sintering temperature and increasing the sintering time in the second step, grain size was enlarged and density was improved. By optimizing the holding time from the 0.80Bi 0.5 Na 0.5 TiO 3 ‐0.20Bi 0.5 K 0.5 TiO 3 ceramics, improved bulk density of 5.81 g/cm 3 , piezoelectric charge coefficient of 170 pC /N and dielectric constant of 1471.29 were obtained. As a result, piezoelectric and structural properties can be enhanced. In this research, we will report the enhanced crystalline and piezoelectric properties of (Bi,Na) TiO 3 ‐(Bi,K) TiO 3 ceramics prepared by the two‐step sintering process.