A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Low-temperature hydro/solvothermal synthesis of Ta-modified K0.5Na0.5NbO3 powders and piezoelectric properties of corresponding ceramics
Highlights ► Hydro/solvothermal provides a milder temperature condition than hydrothermal. ► Ta content and poling temperature affect the piezoelectric properties greatly. ► The optimum sintering temperatures of ceramics are reduced at least 150°C.
Abstract K0.5Na0.5Nb1– xTaxO3 (KNNTx, x=0–0.4) powders were synthesized by a novel hydro/solvothermal method at a low reaction temperature (180°C) and the corresponding ceramics were obtained by normal sintering. Compared with conventional solid-state reaction technique, the optimal sintering temperatures of these ceramics were reduced at least 150°C. Crystalline structures and surface morphologies were analyzed by X-ray diffraction and scanning electron microscopy. The excellent piezoelectric properties could be obtained by selecting poling temperature near the orthorhombic–tetragonal polymorphic phase transition temperature region. Ta-modified KNN ceramics exhibited better piezoelectric properties than those of pure KNN, and the piezoelectric coefficient d 33 showed the maximum value of 156pC/N for KNNT0.3 ceramics. In addition, the sintering temperature for maximum d 33 value differed from that for maximum density. The present hydro/solvothermal method provides a new potential route for preparing KNN-based materials at relatively low temperature.
Low-temperature hydro/solvothermal synthesis of Ta-modified K0.5Na0.5NbO3 powders and piezoelectric properties of corresponding ceramics
Highlights ► Hydro/solvothermal provides a milder temperature condition than hydrothermal. ► Ta content and poling temperature affect the piezoelectric properties greatly. ► The optimum sintering temperatures of ceramics are reduced at least 150°C.
Abstract K0.5Na0.5Nb1– xTaxO3 (KNNTx, x=0–0.4) powders were synthesized by a novel hydro/solvothermal method at a low reaction temperature (180°C) and the corresponding ceramics were obtained by normal sintering. Compared with conventional solid-state reaction technique, the optimal sintering temperatures of these ceramics were reduced at least 150°C. Crystalline structures and surface morphologies were analyzed by X-ray diffraction and scanning electron microscopy. The excellent piezoelectric properties could be obtained by selecting poling temperature near the orthorhombic–tetragonal polymorphic phase transition temperature region. Ta-modified KNN ceramics exhibited better piezoelectric properties than those of pure KNN, and the piezoelectric coefficient d 33 showed the maximum value of 156pC/N for KNNT0.3 ceramics. In addition, the sintering temperature for maximum d 33 value differed from that for maximum density. The present hydro/solvothermal method provides a new potential route for preparing KNN-based materials at relatively low temperature.
Low-temperature hydro/solvothermal synthesis of Ta-modified K0.5Na0.5NbO3 powders and piezoelectric properties of corresponding ceramics
Li, Lu (author) / Gong, Yue-Qiu (author) / Gong, Lun-Jun (author) / Dong, Hui (author) / Yi, Xi-Feng (author) / Zheng, Xue-Jun (author)
2011-03-14
5 pages
Article (Journal)
Electronic Resource
English
| British Library Online Contents | 2012
| British Library Online Contents | 2013
Synthesis of Fine Nickel Powders by Solvothermal Method
| British Library Online Contents | 2007
Synthesis of Nano ITO Powders Prepared by Solvothermal Process
| British Library Online Contents | 2005
Solvothermal synthesis of nano-sized tetragonal barium titanate powders
| British Library Online Contents | 2006