Abstract：With the trend of miniaturization of electronic components，the grain size effect of dielectric ceramics has been widely concerned in recent years. In this work，the grain size effect of 0. 94Na0.5Bi0.5TiO3 -0. 06BaTiO3 （NBT-6BT） ceramics was systematically investigated. A series of highly dense NBT-6BT ceramics with average grain size ranging from 0. 72 μm to 1. 84 μm were prepared by both traditional sintering and two-step sintering method. The effect of grain size on the crystal structure，dielectricity，piezoelectricity and ferroelectricity of ceramics were investigated. Experimental results show that lattice constant changes with the varying grain size. When the grain size is 1. 24 μm，the ceramics show the best crystallinity， along with the maximal values of the relative dielectric constant， piezoelectric coefficient and electromechanical coupling coefficient （εr ＝ 2 405, d33 ＝ 150 pC/N and Kp ＝ 29. 5％ ）. The residual polarization Pr of NBT-6BT ceramics have been raised with the increasing grain size，while the coercive field Ec exhibits an opposite trend. Experimental study shows that controlling the grain size of ferroelectric materials is an effective means to obtain excellent comprehensive properties.
Key words：NBT-6BT；grain size；dielectricity；piezoelectricity；ferroelectricity
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