Enhanced Ferroelectric and Piezoelectric Properties of Textured K0.45Na0.55NbO3 Ceramics Prepared by Screen-printing Technique

doi:10.3724/SP.J.1077.2011.11519

Abstract

Abstract:

Grain oriented K_0.45Na_0.55NbO₃ (KNN) lead-free piezoceramics with sintering aid K₄CuNb₈O₂₃ (KCN) were fabricated by screen-printing technique, using plate-like NaNbO₃ as templates. The plate-like NaNbO₃ template particles were synthesized from bismuth layer-structured Bi_2.5Na_3.5Nb₅O₁₈ precursors by the topochemical micro-crystal conversion method. The textured KNN ceramics showed brick-wall-like grains which aligned parallel to the screen-printing direction. The screen-printed KNN ceramics possessed both a high grain orientation (Lotgering factor f=95%) and a relative high density (92% of theoretical density). The orientation degree and electrical properties of textured (K_0.45Na_0.55)NbO₃ ceramics exhibited anisotropic feature in the parallel (sp//) and perpendicular (sp?) plane. Compared with the random oriented ceramics with same composition, the dielectric constant ε_r, piezoelectric constant d₃₃, and electromechanical coupling coefficient k_p were increased by about 75%, 44% and 42% in sp// plane, respectively, and about 35%, 30% and 35% in sp? plane, respectively. Screen-printing is a simple and effective method for the fabrication of grain oriented lead-free piezoelectric ceramics.

Key words: grain orientation, texture, screen-printing, KNN ceramic

CLC Number:

TB321

LI Ya-Li, HUI Chun, LI Yong-Xiang, WANG You-Liang. Enhanced Ferroelectric and Piezoelectric Properties of Textured K_0.45Na_0.55NbO₃ Ceramics Prepared by Screen-printing Technique[J]. Journal of Inorganic Materials, 2012, 27(2): 214-218.

Figures/Tables 7

Fig. 1 The micrograph of molten salt synthesized NaNbO3 platelets

Fig. 2 XRD patterns of textured KNN ceramics sintered at 970℃, 1070℃, 1080℃, 1090℃ for 2 h in air

Fig. 3 SEM images of KNN textured ceramics sintered at (a) 970℃; (b) 1080℃

Fig. 4 XRD patterns of the textured KNN ceramics in the sp// plane, sp^ plane, and the random-oriented ceramics

Fig. 5 The P-E hysteresis loops of the textured and random- oriented KNN ceramics measured at room temperature

Fig. 6 The temperature dependence of the dielectric properties for the textured KNN ceramics in sp// plane and sp⊥ plane in comparison with random-oriented KNN ceramic

Table 1 Comparison of electrical properties between textured and random-oriented KNN ceramics

Electrical property	Textured ceramics (sp//)	Textured ceramics (sp⊥)	Random-oriented ceramics
ε_r (1 kHz)	432	331	246
tgδ (1 kHz)	0.06	0.04	0.02
P_r/(μC·cm^-2)	18.4	18.6	23.1
E_c/(kV·cm^-1)	10.1	10.5	12.6
d₃₃/(pC·N^-1)	133	120	92
k_P	0.44	0.42	0.31
T_c /℃	401	401	401

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Enhanced Ferroelectric and Piezoelectric Properties of Textured K_0.45Na_0.55NbO₃ Ceramics Prepared by Screen-printing Technique

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