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论文类型：期刊论文

发表时间：2008-04-15

发表刊物：MATERIALS LETTERS

收录刊物：SCIE、EI

卷号：62

期号：10-11

页面范围：1685-1688

ISSN号：0167-577X

关键字：spherical alpha-alumina; emulsion-based synthesis; sol-gel preparation; powder technology

摘要：Unaggregated spherical a-alumina powder was prepared by the controlled hydrolysis of Al(OPri)(3) in a dilute solution consisting of CH3 (CH2)(6)CH2OH and CH3CN. Spherical AlOOH precursors crystallized to gamma-alumina at 1000 degrees C and converted to alpha-alumina at 1150 degrees C without intermediate phases. The particle morphology was retained after crystallization to alpha-alumina. The thermal behavior of spherical AlOOH precursors was characterized by differential thermal analysis (DTA). X-ray diffraction (XRD) was used to confirm the conversion of crystalline phase of alumina powder from amorphous to a-phase. Transmission electron microscopy (TEM) was used to investigate the morphologies and size of the precursors and products. The specific surface areas of alpha-alumina were measured by nitrogen adsorption technique. (c) 2007 Elsevier B.V. All rights reserved.