More direct evidence of the fcc arrangement for artificial opal
| Autor: | Peng Dong, Zhaolin Li, Xingcai Guo, Bingying Cheng, Chongjun Jin, Daozhong Zhang, Peigen Ni |
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| Rok vydání: | 1999 |
| Předmět: |
Materials science
business.industry Sedimentation (water treatment) Scanning electron microscope Stacking Crystal structure Colloidal crystal Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials Suspension (chemistry) Optics SPHERES Electrical and Electronic Engineering Physical and Theoretical Chemistry business Photonic crystal |
| Zdroj: | Optics Communications. 170:41-46 |
| ISSN: | 0030-4018 |
| Popis: | We present a scanning electron microscopy (SEM) investigation of artificial opals prepared by the sedimentation of suspension with sub-micrometer silica spheres. An analysis of the SEM images confirms that the fcc stacking is the most stable phase for the artificial crystals. Optical diffraction and transmission spectrum indicate a good alignment of the top (111) crystal plane. We also show that defects and dislocations of opal crystals are caused mainly by the irregular spheres. Slow sedimentation and uniform size of silica spheres may be the key factors for growing high quality opal crystals. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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