纳米晶SnO_2粉末的制备(英文)

PREMRATION OF NANOCRYSTALLINE SnO2 POWDERS

采用常规溶液化学沉淀法，通过仔细控制沉淀速率得到类独石状 Ｓｎ（ＯＨ）４沉淀物采用两种不同的煅烧工艺制备ＳｎＯ２粉，即：常规的将沉淀物磨成粉末后煅烧和将类独石状沉淀物直接煅烧．选取４５０，６００， ７５０， ９００和 １０５０℃ ５个温度条件，保温２ｈ煅烧，结果表明直接煅烧法得到的 ＳｎＯ２粉末的晶粒平均尺度（１０～３０ｎｍ）较常规煅烧工艺得到的 ＳｎＯ２粉末（１２～５０ｎｍ）小．

Tin dioxide powders were prepared by solution method using inorganic salt as a starting material. By well controlling precipitation rate, the homogeneous and condensed precipitates were obtained which were in the form of nearly transparent monolith. These tin hydroxide precipitates were calcinated at 450, 600, 750, 900 and 1050℃ for 2h to form pure SnO2 powders which have very small crystallite sizes. X-ray powder diffraction results showed that the crystallite sizes are in the range of 10～30 nm as the calcination temperature increased from 450 to 1050℃, which indicates that the crystallite size of as synthesized powders is not very sensitive to temperature.