Structure and Properties of (K0.5Na0.5)1-2xSrx(Nb0.94 Sb0.06)O3 Lead-free Piezoelectric Ceramics

doi:10.3724/sp.j.1077.2009.00433

Abstract

Abstract: Leadfree piezoelectric ceramics (K_0.5Na_0.5)_1-2xSr_x(Nb_0.94Sb_0.06)O₃ (abbreviated as KNSNS1000x) were synthesized by the conventional ceramic sintering technique. The structure and electrical properties of KNSNS1000x ceramics were investigated. The results of XRD indicate that KNSNS1000x ceramics have an orthorhombic structure. The proper content of Sr substitute increases the density of ceramics which reaches the maximum value of 4.411g/cm³ at x=0.008. With the increase of the amount of Sr, the T_c decreases and the temperature of orthorhombictetragonal phase transition (T_o-t) is almost a constant.In the temperature range from 0℃ to 200℃, dielectric constant of KNSNS1000x ceramics is independent of frequency. The KNSNS8 ceramics obtains the optimum piezoelectric properties: d₃₃=155pC/N, k_p=0.361，Q_m=120，N_p=2862，P_r=23μC/cm²，E_c=1.4kV/mm，ρ=4.411g/cm³.

Key words: leadfree piezoelectric ceramics, sodium potassium niobate, piezoelectric properties

CLC Number:

TM282

FAN Gui-Fen,LUWen-Zhong,RAO Yuan-Yuan. Structure and Properties of (K_0.5Na_0.5)_1-2xSr_x(Nb_0.94Sb_0.06)O₃ Lead-free Piezoelectric Ceramics[J]. Journal of Inorganic Materials, DOI: 10.3724/sp.j.1077.2009.00433.

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Structure and Properties of (K_0.5Na_0.5)_1-2xSr_x(Nb_0.94Sb_0.06)O₃ Lead-free Piezoelectric Ceramics

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