Preparation of Ferroelectric KNbO3 Based Borate Glass System
| Autor: | Chatchai Kruea-In, Pratthana Intawin, Wilaiwan Leenakul |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
Materials science
Potassium niobate Biomedical Engineering Bioengineering Borate glass General Chemistry Condensed Matter Physics Microstructure law.invention Crystal Crystallinity chemistry.chemical_compound chemistry law visual_art Phase (matter) visual_art.visual_art_medium General Materials Science Ceramic Composite material Crystallization |
| Zdroj: | Journal of Nanoscience and Nanotechnology. 15:9256-9260 |
| ISSN: | 1533-4899 1533-4880 |
| DOI: | 10.1166/jnn.2015.11410 |
| Popis: | The incorporation method was employed to produce ferroelectric glass ceramics from the K2O-Nb2O5-B2O3 glass system. The nanocrystalline potassium niobate (KNbO3) was first prepared using a simple mixed oxide method, where the B2O3 was initially mixed and then melted to form glass. The successfully produced optically transparent glass was then subjected to a heat treatment schedule for further crystallization at temperatures ranging from 500 to 650 degrees C, which resulted in the precipitation of the KNbO3 phase, together with the K3B2Nb3O12 phase. Scanning electron microscopy (SEM) showed the presence of randomly oriented KNbO3 crystals dispersed in a continuous glass matrix. It was found that the glass ceramics subjected to the heat treatment at temperatures higher than 545 degrees C were opaque, while the lower gave a highly transparent glass ceramics. The crystal size and crystallinity were found to increase with increasing heat treatment temperature, which in turn plays an important role in controlling the properties of the glass ceramics, including physical, optical, and dielectric properties. |
| Databáze: | OpenAIRE |
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