Piezoelectric and Electrical Properties of Lead-Free (Na&lt;sub&gt;0.5&lt;/sub&gt;K&lt;sub&gt;0.5&lt;/sub&gt;)NbO&lt;sub&gt;3&lt;/sub&gt;- Bi&lt;sub&gt;0.5&lt;/sub&gt;(Na&lt;sub&gt;0.80&lt;/sub&gt;K&lt;sub&gt;0.20&lt;/sub&gt;)&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.230-232.12

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Piezoelectric and Electrical Properties of Lead-Free (Na0.5K0.5)NbO3- Bi0.5(Na0.80K0.20)0.5TiO3 Ceramics

Chun Huy Wang

Year: 2011 Journal: Advanced materials research Vol: 230-232 Pages: 12-15 Publisher: Trans Tech Publications

DOI: 10.4028/www.scientific.net/amr.230-232.12

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Abstract

Extending the investigations on (Na 0.5 K 0.5 )NbO 3 -based solid solution for lead-free piezoelectric ceramics, this paper consider the complex solid-solution system (Na 0.5 K 0.5 )NbO 3 –Bi 0.5 (Na 0.8 0 K 0. 20 ) 0.5 TiO 3 [NKN-BNKT]. (Na 0.5 K 0.5 )NbO 3 with 2 ~ 6 mol% Bi 0.5 (Na 0.8 0 K 0. 20 ) 0.5 TiO 3 has been prepared following the conventional mixed oxide process. A morphotropic phase boundary (MPB) between orthorhombic (O) and tetragonal (T) was found at the composition 0.97NKN-0.03BNKT with correspondingly enhanced dielectric and piezoelectric properties. The electromechanical coupling factor and dielectric constant are higher for compositions near the MPB. The dielectric constant (ε r ), planar coupling coefficient ( k p ) and thickness coupling coefficient ( k t )of 0.97NKN-0.03BNKT ceramics were 1483, 32% and 31%, respectively.

Keywords:

Natural bond orbital Materials science Dielectric Phase boundary Orthorhombic crystal system Analytical Chemistry (journal) Piezoelectricity Electromechanical coupling coefficient Tetragonal crystal system Solid solution Phase (matter) Mineralogy Crystallography Crystal structure Chemistry Composite material Metallurgy Density functional theory Optoelectronics

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Ferroelectric and Piezoelectric Materials

Physical Sciences → Materials Science → Materials Chemistry

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Piezoelectric and Electrical Properties of Lead-Free (Na<sub>0.5</sub>K<sub>0.5</sub>)NbO<sub>3</sub>- Bi<sub>0.5</sub>(Na<sub>0.80</sub>K<sub>0.20</sub>)<sub>0.5</sub>TiO<sub>3</sub> Ceramics

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