Dielectric and Piezoelectric 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;0.85&lt;/sub&gt;K&lt;sub&gt;0.15&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.211-212.152

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Dielectric and Piezoelectric Properties of Lead-Free (Na0.5K0.5)NbO3- Bi0.5(Na0.85K0.15)0.5TiO3 Ceramics

Chun Huy Wang

Year: 2011 Journal: Advanced materials research Vol: 211-212 Pages: 152-155 Publisher: Trans Tech Publications

DOI: 10.4028/www.scientific.net/amr.211-212.152

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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 0.85 K 0.15 ) 0.5 TiO 3 [NKN-BNKT]. (Na 0.5 K 0.5 )NbO 3 with 2 ~ 6 mol% Bi 0.5 (Na 0.85 K 0.15 ) 0.5 TiO 3 has been prepared following the conventional mixed oxide process. A morphotropic phase boundary (MPB) between orthorhombic (O) and hexagonal (H) was found at the composition 0.96NKN-0.04BNKT with correspondingly enhanced dielectric and piezoelectric properties. The electromechanical coupling factor and dielectric constant are higher for compositions near the MPB. The dielectric constant (K T 33 ), planar coupling coefficient ( k p ) and thickness coupling coefficient ( k t )of 0.96NKN-0.04BNKT ceramics were 1273, 34% and 38%, respectively.

Keywords:

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

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Dielectric and Piezoelectric 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>0.85</sub>K<sub>0.15</sub>)<sub>0.5</sub>TiO<sub>3</sub> Ceramics

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