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KTa0.4Nb0.6O3 nanoparticles synthesized through solvothermal method |
| ZHENG Ke-yu1, WEI Nian2, YANG Feng-xia2, ZHANG Duan-ming2, QI Ya-jun3 |
| 1.Physics Department, Huazhong University of Science and Technology, Wuhan 430074, China; Faculty of Materials Science & Engineering and Hubei Key Laboratory of Ferroelectric and Piezoelectric Materials and Devices, Hubei University, Wuhan 430062, China; 2.Physics Department, Huazhong University of Science and Technology, Wuhan 430074, China; 3.Faculty of Materials Science & Engineering and Hubei Key Laboratory of Ferroelectric and Piezoelectric Materials and Devices, Hubei University, Wuhan 430062, China; |
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Abstract Potassium tantalate niobate (KTa0.4Nb0.6O3, KTN) nanoparticles of perovskite structure were success-sfully synthesized by a solvothermal method. The KTN nanoparticles synthesized at 250 ! for 8 h with 1 to 4 M KOH concentration using isopropyl alcohol [(CH3)2 CHOH] as the solvent was composed of a single phase of cubic perovskite structure. Futhermore, the KTN powers synthesized at the same conditions besides of using (CH3)2CHOH/H2O as a solvent compose of a single phase of tetragonal perovskite structure. The nanoparticles exhibit a mixture of cubic and prism-like shapes with lengths of 100 nm to 500 nm and average cross sections of 200×200 nm2. The solvent dependence of the powder formation is discussed. X-ray diffraction and electron diffraction results show that the powders have the needed tetragonal perovskite structure. The band gap of KTN nanoparticles is determined to be 3.26 eV from the optical absorption spectra.
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Issue Date: 05 December 2007
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