摻雜Cr3+之莫來石玻璃陶瓷的結晶與光學性質

Crystallization and Optical Properties of Cr3+-doped Mullite Glass-Ceramics

黃振財(Chen-Tsai Huang)

指導教授 ： 徐錦志

大同大學/工程學院/材料工程學系所/碩士(2004年)

摘要

添加Cr3+的莫來石玻璃陶瓷可應用於可調（tunable）雷射及太陽能聚集器（solar concentrators）。本研究是固定起始玻璃中之SiO2-Al2O3-B2O3-ZnO-K2O成分，添加不同含量之Cr2O3，經適當的熱處理，於玻璃基地中生成奈米尺寸莫來石結晶顆粒。Cr是產生冷光之物質，但Cr也可能影響成核與結晶行為，進而影響微觀結構與性質。故改變Cr2O3之含量，探討是否能更進一步提昇性質。
在DTA分析，隨Cr2O3由0增加至0.5時，Tp會降低再增高，而在0.25時，Tp有最小值。在XRD分析，添加Cr2O3的成分，經成核-晶體成長之兩階段熱處理，以形成玻璃陶瓷，主結晶相為莫來石。在紫外光-可見光及紅外光穿透率分析，可看出添加Cr2O3的玻璃陶瓷在可見光有吸收現象，而在近紅外光無明顯吸收。在PL螢光光譜儀分析，添加0.1 Cr2O3的莫來石玻璃陶瓷，隨成核溫度升高及成核時間增加，晶粒徑變小及結晶量增多，而後隨結晶溫度升高及結晶量增多，放射強度較大。

關鍵字

透光 ； 莫來石 ； 玻璃陶瓷

並列摘要

Mullite glass-ceramics doped Cr3+ to be possible to apply to being possible to adjust the laser and the solar concentrators. This study is SiO2-Al2O3-B2O3-ZnO-K2O in the fixed parent glass the ingredient, doped different content of the Cr2O3, after the suitable heat treatment, produces nano- size mullite crystallization pellet in the glass. Cr produces matter of the Luminescence, but Cr also possibly affects the nucleation and the crystal behavior, then influence microstructure and properties. Therefore changes content of the Cr2O3, discusses whether can further promote the properties.
When DTA analysis, along with Cr2O3 by 0 increase to 0.5, Tp can reduce advances again, but when 0.25, Tp has the minimum value. In the XRD analysis, the increase content of the Cr2O3, second the stages heat treatments after nucleation - growth, forms the glass-ceramics, the main crystallization phase is the mullite. In the UV- visible and the infrared transmission analysis, is worthy of looking at increases Cr2O3 the glass -ceramics to have the absorption phenomenon in the visible, but not obviously absorbs in the near-infrared. In the Photoluminescence analysis, increases 0.1 Cr2O3 the mullite glass ceramics, increases along with nucleation temperature and the nucleation time, the crystal size changes small and the crystallized amount increases. Then increases along with crystallization temperature and crystallized amount, the emission intensity is bigger.

並列關鍵字

glass-ceramics ； mullite ； Transparent

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