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A new lead-free piezoelectric ceramics of (1 1 x)Bi0.5Na0.5TiO3­xBa(Ni1/3Nb2/3)O3 (BNT­BNN) (x = 0.0­0.07) have been prepared by a conventional solid reaction method. Their structures and electric properties have been investigated systematically. A pure perovskite phase can be formed in x ̄ 0.06. By the introduction of Ba(Ni1/3Nb2/3)O3, the ceramics exhibit a lower coercive field EC. Composition for x = 0.02 shows optimal piezoelectric properties, with the piezoelectric coefficient d33 = 121 pC/N. Temperature dependent P(E) loops and S(E) curves of 0.98BNT­0.02BNN indicate that the phase transition from the ferroelectric to antiferroelectric takes place over a very wide temperature range from 75 to 150°C.

journal of the ceramic society of japan

Preparation and electrical properties of the new lead-free (1 &amp;minus; &lt;i&gt;x&lt;/i&gt;)Bi&lt;sub&gt;0.5&lt;/sub&gt;Na&lt;sub&gt;0.5&lt;/sub&gt;TiO&lt;sub&gt;3&lt;/sub&gt;&amp;ndash;&lt;i&gt;x&lt;/i&gt;Ba(Ni&lt;sub&gt;1/3&lt;/sub&gt;Nb&lt;sub&gt;2/3&lt;/sub&gt;)O&lt;sub&gt;3&lt;/sub&gt; piezoelectric ceramics