Piezoelectric performance of 0.5BaZr0.2Ti0.8O3-0.5Ba1-xCaxTiO3 at triple phase point. Issue 20 (15th October 2022)

• Record Type: Journal Article
• Authors: Khien, N.V.; Xuan, C.T.A.; Hong, L.V.; Hue, L.T.; Hoa, D.T.; Linh, P.H.; Ha, L.T.; Thoan, N.H.; Long, N.D.; Tho, P.T.
• Is Part Of: Ceramics international. Volume 48:Issue 20(2022)
• Page Start: 30093
• Page End: 30100
• Publication Date: 2022-10-15
• Subjects: Piezoelectric -- Dielectric relaxation -- Triple phase point; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2022.06.280
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: 0.5BaZr0.2 Ti0.8 O3 -0.5Ba1-x Cax TiO3 ceramic samples with x = 15–35% have been fabricated to investigate the composition-driven phase evolution, ferroelectric, and piezoelectric properties. X-ray diffraction and temperature-dependent permittivity studies reveal the structural phase transition from the rhombohedral (R) to R + orthorhombic (O) and then O + tetragonal (T) having a tricritical triple phase points consisting of the R + O + T at x = 29.6%. The average grain size tends to increase with x but there is an exception of reducing grain size for x = 29.6%. The triple phase point displays the outstanding properties, such as minimum relaxation time (τ = 6.4 ms), large piezoelectric response ( d 33 = 543 pC/N), high saturation polarization ( P S = 16.5 μC/cm 2 ), small coercive field ( E c = 0.6 kV/cm), and high dielectric permittivity, over 8700 peaking at 21, 765. These parameters reduce drastically at the O/R and O/T phase boundaries. Our studies indicate the important role of multiphase coexistence for enhancing the piezoelectric properties.