Synthesis and Characterization of Nanocrystalline Forsterite Fiber

以醇鹽前導物經溶凝膠過程，可由黏滯溶液中抽製均質鎂橄欖石凝膠纖維。乾燥後之纖維狀凝膠經X光繞射分析呈非晶質態，且於550℃開始發生鎂橄欖石結晶。紅外線光譜分析顯示，膠體纖維於熱處理過程中，可藉由矽院基與熱分解之醋酸配位基間進一步發生縮合反應。經加熱800℃後，鎂橄欖石纖維呈奈米結晶及緻密化結構，晶粒度約為20-30 nm；於1300℃熱處理後，晶粒成長約為0.3-0.5μm，其室溫介電常數為7.2±0.6 (l MHz)。

關鍵字

鎂橄欖石；凝膠纖維；奈米晶型

並列摘要

Homogeneous forsterite gel fibers were drawn from viscous solutions prepared by sol-gel processing of alkoxide precursors. The dried fibrous gel was amorphous to X-rays, and commenced crystallizing into forsterite phase at temperature as low as 550℃. The infrared spectra on heating the gel fibers indicated that a further condensation might occur between the silanol groups and the decomposition of acetate ligand groups. Upon heating at 800℃, the forsterite ceramic fiber exhibited nanocrystals of approximately 20-30 nm in size and dense microstructure; further heating to l300℃ resulted in grain growth up to 0.3-0.5μm with a dielectric constant of about 7.2±0.6, at 1 MHz.

並列關鍵字

Forsterite ； Gel fiber ； Nanocrystalline

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