Enhanced dielectric and ferroelectric behavior in 0.94BNT-0.06BCTS lead free piezoelectric ceramics synthesized by the solid state combustion technique. Issue 187 (12th February 2018)

• Record Type: Journal Article
• Authors: Kornphom, C.; Rittisak, J.; Laowanidwatana, A.; Bongkarn, T.
• Is Part Of: Integrated ferroelectrics. Issue 187(2018)
• Page Start: 20
• Page End: 32
• Publication Date: 2018-02-12
• Subjects: BNT-BCTS -- combustion technique -- microstructure -- piezoelectric properties -- ferroelectric properties; Ferroelectric devices -- Periodicals; Integrated circuits -- Periodicals; 537.244805
• DOI: 10.1080/10584587.2018.1445372
• Languages: English
• ISSNs: 1058-4587

Abstract

ABSTRACT: In this study, the effects of calcination temperature (600–900°C for 2 h) and sintering temperature (1100–1200°C for 2 h) on phase formation, microstructure and electrical properties of new 0.94(Bi0.5 Na0.5 TiO3 )-0.06(Ba0.945 Ca0.055 )(Ti0.91 Sn0.09 )O3 (0.94BNT-0.06BCTS) lead-free piezoelectric ceramics were investigated. These ceramics were fabricated by the solid state combustion technique using glycine as fuel. It was found that single perovskite phase of 0.94BNT-0.06BCTS powders is obtained by the sample calcined at 650°C for 2 h. The microstructure of the 0.94BNT-0.06BCTS powders showed an almost-circle shape and the average particle size increased from 218 to 298 nm when the calcination temperature was increased from 600 to 900°C. The XRD pattern of all ceramics presented a single perovskite structure with the co-existence of the rhombohedral and tetragonal phase. The average grain size increased with increasing sintering temperature. The density, dielectric constant (at Tr and Tm ) and piezoelectric constant (d33 ) increased when sintering temperature was increased up to 1150°C and then, reduced in values, respectively. At a sintering temperature of 1150°C, 0.94BNT-0.06BCTS ceramic exhibited the highest density (5.95 g.cm −3 ), the highest dielectric constant at Tm (ϵmax = 6210), the strongest ferroelectric properties (Pr = 43.4 μC/cm 2 and Ec 37.68 kV/cm) and the highest d33 value (189 pC/N). The large ferroelctricity in 0.94BNT-0.06BCTS ceramic make them good candidates for lead-free practical applications as a ferroelectric capacitor.