Investigation of zinc-modified lead barium strontium zirconium niobium titanate solid solutions for tailored dielectric and ferroelectric properties

摘要

Polycrystalline solid solutions of [Pb_(1-x-y)Ba_xSr_y][Zr_zTi_(1-z)]_(1-(5k/4)-(m/2))Nb_kZn_mO_3 (PBSZZNT) substituted as [Pb_(0.973)Ba_(0.015)Sr_(0.012)][Zr_(0.53)Ti_(0.47)]_(0.975-(m/2))Nb_(0.02)Zn_mO_3 where m = 0, 0.5, 1.0 and 1.5 mol% have been synthesized through a solid-state reaction method and their dielectric and ferroelectric properties were investigated. X-ray diffraction patterns indicated that all compositions exhibit a single ferroelectric tetragonal phase (FE_(TET)). The average grain growth increased to 1 mol% Zn (2.42 μm) while the density was promoted up to 1.5 mol% Zn (7.74 gm/cm~3) doped PBSZNT ceramics, respectively. Dielectric studies reveal that the room-temperature dielectric constant (ε_(RT)) decreased constantly while the Curie temperature (T_c) showed mixed behavior in Zn-doped PBSZNT ceramics, respectively. The optimum ferroelectric properties were observed in 1 mol% Zn doped PBSZNT where both A-site and B-site modification was evidently enhanced (P_r = 33.12 μC/cm~2 and P_s = 39.86 μC/cm~2) with relatively decreasing coercive field. The influence of Zn-modified compositions on the Ti-rich region (Zr/Ti = 53/47) in PBSZNT ceramics showed significant variations that are discussed.