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Ferroelectrics Volume 367, 2008 - Issue 1
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SECTION A: BULK MATERIALS: SINGLE CRYSTALS, CERAMICS AND COMPOSITES

Deterioration Mechanism for the Electrical Property of Lead-Free Na0.5K0.5NbO3 Piezoceramics Sintered with Al2O3-based Crucible

Hitoshi Matsudo Department of Materials Science and Engineering, Graduate School of Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya, 466-8555, Japan
,
Ken-ichi Kakimoto Department of Materials Science and Engineering, Graduate School of Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya, 466-8555, Japan
,
Hiroshi Aoyama Otake Gaishi Co., Ltd., 3-3 Hagidono-cho, Seto, Aichi, 489-0885, Japan
,
Hiroshi Nagaya Otake Gaishi Co., Ltd., 3-3 Hagidono-cho, Seto, Aichi, 489-0885, Japan
&
Izumi Otake Otake Gaishi Co., Ltd., 3-3 Hagidono-cho, Seto, Aichi, 489-0885, Japan
Pages 82-88 | Received 03 Sep 2007, Accepted 27 Feb 2008, Published online: 20 Sep 2010
 
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Abstract

Molten alkali corrosion test has been carried out for the alumina-based crucibles with different MgO/(SiO 2 +MgO) ratios to determine the container composition suitable for the firing of lead-free (Na 0.5 K 0.5 )NbO 3 (NKN) piezoelectric ceramics. The alumina crucibles with MgO/(SiO 2 +MgO) ratios of 0.20 and 0.25 showed the best corrosion resistance and prevented the degradation of NKN ceramics in their dielectric and ferroelectric properties. It was confirmed that the electric property of alkali niobate piezoelectric ceramics was strongly correlated with the durability of the crucible against alkali corrosion.

Acknowledgment

This work was financially supported by Industrial Technology Research Grant Program in 2007 from New Energy and Industrial Technology Development Organization (NEDO) of Japan.

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