Physical and Electrical Properties of Lead-Free (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;–(Bi&lt;sub&gt;0.5&lt;/sub&gt;K&lt;sub&gt;0.5&lt;/sub&gt;)TiO&lt;sub&gt;3&lt;/sub&gt; Ceramics

Chun Huy Wang

doi:10.4028/www.scientific.net/amr.239-242.3240

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JOURNAL ARTICLE

Physical and Electrical Properties of Lead-Free (Bi0.5Na0.5)TiO3–(Bi0.5K0.5)TiO3 Ceramics

Chun Huy Wang

Year: 2011 Journal: Advanced materials research Vol: 239-242 Pages: 3240-3243 Publisher: Trans Tech Publications

DOI: 10.4028/www.scientific.net/amr.239-242.3240

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Abstract

Extending the investigations on (Bi 0.5 Na 0.5 )TiO 3 -based solid solution for lead-free piezoelectric ceramics, this paper consider the complex solid-solution system (Bi 0.5 Na 0.5 )TiO 3 –(Bi 0.5 K 0.5 )TiO 3 [BNT-BKT]. (Bi 0.5 Na 0.5 )TiO 3 with 7~ 30 mol% (Bi 0.5 K 0.5 )TiO 3 ceramics have been prepared following the conventional mixed oxide process. A morphotropic phase boundary (MPB) between rhombohedral (R) and tetragonal (T) was found at the composition 0.82BNT-0.18BKT with correspondingly enhanced piezoelectric properties. The electromechanical planar coupling factor is higher for compositions near the MPB. The mechanical quality factor (Q m ), planar coupling coefficient ( k p ) and thickness coupling coefficient ( k t ) of 0.82BNT-0.18BKT ceramics were 125, 28.8% and 47.4%, respectively.

Keywords:

Phase boundary Tetragonal crystal system Materials science Ceramic Piezoelectricity Electromechanical coupling coefficient Analytical Chemistry (journal) Solid solution Coupling (piping) Mineralogy Phase (matter) Crystallography Metallurgy Crystal structure Composite material Chemistry

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Physical and Electrical Properties of Lead-Free (Bi<sub>0.5</sub>Na<sub>0.5</sub>)TiO<sub>3</sub>–(Bi<sub>0.5</sub>K<sub>0.5</sub>)TiO<sub>3</sub> Ceramics

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