Thermal Stability and Humidity Resistance of ScTaO4 Modified (K0.5Na0.5)NbO3 Ceramics
ZHENG Li-Mei1, WANG Jin-Feng1, WANG Chun-Ming1, WU Qing-Zao2, ZANG Guo-Zhong3
1School of Physics, Shandong University, Jinan 2501002China Shipbuilding Industry Corporation, No. 726 Institution, Shanghai 2011083School of Material Science and Engineering, Liaocheng University, Liaocheng 252059
Thermal Stability and Humidity Resistance of ScTaO4 Modified (K0.5Na0.5)NbO3 Ceramics
ZHENG Li-Mei1, WANG Jin-Feng1, WANG Chun-Ming1, WU Qing-Zao2, ZANG Guo-Zhong3
1School of Physics, Shandong University, Jinan 2501002China Shipbuilding Industry Corporation, No. 726 Institution, Shanghai 2011083School of Material Science and Engineering, Liaocheng University, Liaocheng 252059
摘要Lead-free (Na0.5K0.5)NbO3-xmol% ScTaO4 (x=0-1.5) ceramics are prepared using the conventional solid-state reaction method and their properties are investigated in detail. The results indicate that the piezoelectric properties and density are improved by the introduction of ScTaO4. Due to the high orthorhombic-tetragonal phase transition temperature TO-T (around 200°C), stable piezoelectric properties against temperature are obtained. In a wide temperature range of 15-160°C, kp of the (Na0.5K0.5)NbO3-0.5mol% ScTaO4 ceramic remains almost unchanged and d31 increases slightly from 59pC/N to 71pC/N. The deliquescent problem is effectively solved by the addition of ScTaO4. The piezoelectric properties of ScTaO4 modified (Na0.5K0.5)NbO3 ceramics show no obvious reduction and dielectric loss increases slightly after 120h of immersion. From the analysis, it is suggested that the density is an important factor that improves the humidity resistance of the specimens.
Abstract：Lead-free (Na0.5K0.5)NbO3-xmol% ScTaO4 (x=0-1.5) ceramics are prepared using the conventional solid-state reaction method and their properties are investigated in detail. The results indicate that the piezoelectric properties and density are improved by the introduction of ScTaO4. Due to the high orthorhombic-tetragonal phase transition temperature TO-T (around 200°C), stable piezoelectric properties against temperature are obtained. In a wide temperature range of 15-160°C, kp of the (Na0.5K0.5)NbO3-0.5mol% ScTaO4 ceramic remains almost unchanged and d31 increases slightly from 59pC/N to 71pC/N. The deliquescent problem is effectively solved by the addition of ScTaO4. The piezoelectric properties of ScTaO4 modified (Na0.5K0.5)NbO3 ceramics show no obvious reduction and dielectric loss increases slightly after 120h of immersion. From the analysis, it is suggested that the density is an important factor that improves the humidity resistance of the specimens.
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2009, Vol. 26 
