Growth of (Na0.5Bi0.5)TiO3-SrTiO3 single crystals by solid state crystal growth
| Autor: | Hung Vu, Dae-Ki Lee, Dang Thanh Nguyen, Hengyang Sun, Thuy Linh Pham, Jong-Sook Lee, John Fisher |
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| Rok vydání: | 2016 |
| Předmět: |
010302 applied physics
Materials science Scattering Process Chemistry and Technology Relative permittivity Crystal growth 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Ferroelectricity Surfaces Coatings and Films Electronic Optical and Magnetic Materials Crystallography Hysteresis Electric field 0103 physical sciences Materials Chemistry Ceramics and Composites 0210 nano-technology Single crystal Seed crystal |
| Zdroj: | Ceramics International. 42:18894-18901 |
| ISSN: | 0272-8842 |
| DOI: | 10.1016/j.ceramint.2016.09.038 |
| Popis: | Single crystals of 0.8(Na 0.5 Bi 0.5 )TiO 3 -0.2SrTiO 3 were grown for the first time by the Solid State Crystal Growth technique (SSCG). [001], [110] and [111]-oriented seed crystals of SrTiO 3 were buried in 0.8(Na 0.5 Bi 0.5 )TiO 3 -0.2SrTiO 3 powder which was then pressed to form samples. Samples were sintered at 1200 °C for 20 h and single crystals of 0.8(Na 0.5 Bi 0.5 )TiO 3 - 0.2SrTiO 3 grew on the seeds. The direction of least growth was [001] (∼60 µm), with the [110] and [111] directions having growth distances of ∼200 µm. Chemical composition of the crystals was analyzed by Electron Probe Micro Analysis and found to be close to the nominal composition, with some volatilization of Na and Bi. Micro-Raman scattering showed that the single crystal has the (Na 0.5 Bi 0.5 )TiO 3 structure. In order to measure the electrical properties, a single crystalline thick film of 0.8(Na 0.5 Bi 0.5 )TiO 3 -0.2SrTiO 3 was grown on a [001]-oriented Nb-doped SrTiO 3 seed crystal. The single crystalline thick film showed relaxor-like relative permittivity vs. temperature behavior and polarization – electric field hysteresis loops for a lossy ferroelectric material. |
| Databáze: | OpenAIRE |
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