Dielectric ferroelectric and piezoelectric properties of BaTib>0.975 b>(Znb>1/3 b>Nbb>2/3 b>)b>0.025 b>Ob>3 b> ceramic
- 作者：L. Khemakhem ; A. Maalej ; A. Kabadou ; A. Ben Salah ; A. Simon ; M. Maglione
- 关键词：Dielectric ; Ferroelectric ; Piezoelectric ; Perovskite ; Ceramic
- 刊名：Journal of Alloys and Compounds
- 出版年：2008
- 期刊代码：45_09258388
- 类别：ms
- 出版时间：20 March 2008
- 卷：452
- 期：2
- 页码：441-445
- 文件大小：202 K
摘要
The present work concerns the preparation, dielectric, ferroelectric and piezoelectric characterizations of the lead-free ceramic composition BaTib>0.975 b>(Znb>1/3 b>Nbb>2/3 b>)b>0.025 b>Ob>3 b>. This lead-free composition could be of great interest for environment friendly applications (dielectric for capacitors, actuators, etc.). This ceramic was prepared using the conventional mixed-oxide technique. The temperature dependence of the dielectric constant of this composition BaTib>0.975 b>(Znb>1/3 b>Nbb>2/3 b>)b>0.025 b>Ob>3 b> was investigated. The rhombohedral–orthorhombic and orthorhombic–quadratic perovskite transitions are characterized by two weak peaks but the tetragonal–cubic ferroelectric–paraelectric one is characterized by a pronounced peak with weak frequency dispersion. Excellent dielectric properties have been obtained for this composition. A black" href="/science?_ob=MathURL&_method=retrieve&_udi=B6TWY-4N3WYHR-1&_mathId=mml4&_user=1067359&_cdi=5575&_rdoc=46&_acct=C000050221&_version=1&_userid=10&md5=c80bb556ccaecc358c5580e15db79589" title="Click to view the MathML source" alt="Click to view the MathML source">b5;′b>r b> value at 1 kHz reaches of about as 9700 was observed. The polarization versus electric field hysteresis measurements showed a well-defined hysteresis loop with a remanent polarization of 1.05 bc;C/cm2 with a coercive field of 0.85 kV/cm at room temperature. BaTib>0.975 b>(Znb>1/3 b>Nbb>2/3 b>)b>0.025 b>Ob>3 b> exhibits an important value of db>31 b> coefficient which reaches as high as 90 pC N−1. From these results, we can consider this composition is of great interest for applications.