Synthesis and Characterization of Nanocrystalline Forsterite Fiber

化學法合成奈米晶型鎂橄欖石纖維及其特性

10.6409/JMSE.200303.0041

蔡木村(Mu-Tsun Tsai)

鎂橄欖石 ； 凝膠纖維 ； 奈米晶型 ； Forsterite ； Gel fiber ； Nanocrystalline

材料科學與工程

35卷1期（2003 / 03 / 01）

41 - 45

英文

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)。

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.