Tailoring the structural, optical properties and photocatalytic behavior of ferroelectric Bi 0.5 K 0.5 TiO 3 nanopowders
| Autor: | Luong Huu Bac, Nguyen Van Chinh, L.T.H. Thanh, Dang Duc Dung, Trinh Van Trung, Nguyen Tri Khoa, Duong Van Thiet |
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| Rok vydání: | 2016 |
| Předmět: |
010302 applied physics
Photoluminescence Materials science Band gap Mechanical Engineering chemistry.chemical_element Nanotechnology 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Ferroelectricity Bismuth Chemical engineering chemistry Mechanics of Materials Phase (matter) 0103 physical sciences Photocatalysis General Materials Science 0210 nano-technology Perovskite (structure) Sol-gel |
| Zdroj: | Materials Letters. 164:631-635 |
| ISSN: | 0167-577X |
| DOI: | 10.1016/j.matlet.2015.11.086 |
| Popis: | Bismuth potassium titanate (Bi0.5K0.5TiO3) nanopowders were synthesized by sol–gel technique. Single-phase perovskite nanopowders were obtained after calcining at temperature smaller than 900 °C and the impure phase was appeared at calcining temperature higher than this temperature. Particles were in nearly round shape with average size about 22 to 36 nm with calcining temperature from 500 to 900 °C, respectively. The bandgap energies annealed at 500–900 °C were between 3.25 and 3.31 eV. Photoluminescence spectra have a broad blue emission band in the range of 400–550 nm, which is related to a multiphonon process. Surface defects and/or narrowing the band gap due to defects resulted in high photocatalytic activity performance. We expect that our work will open a new direction for application of lead-free ferroelectric materials in cleaning environment. |
| Databáze: | OpenAIRE |
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