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SYNTHESIS OF THE SI-C FINE GRAINS HAVING 11 MICRONS BROAD FEATURE.

具有 11 微米宽泛特征的 Si-C 细粒的合成。

基本信息

批准号：
61540177
负责人：
WADA Setsuko
金额：
$ 0.9万
依托单位：
THE UNIVERSITY OF ELECTRO-COMMUNICATIONS
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1986
资助国家：
日本
起止时间：
1986 至 1987
项目状态：
已结题

项目摘要

In our galaxy 10 <micrn> m broad spectra of the circumstellar dust are observed in circumstellar envelopes of o-rich stars and 11<micrn> m broad spectra are observed in envelopes of C-rich stars. These 11 <micrn> m emission are thought to be caused by si-c dusts. It is difficult to form directly Si-C dusts from Si-C molecules or radicals artificially. We assumed that the Si-C dusts are formed form a mixture of SiO and C-containing molecules and radicals. We try to form Si-C dusts as follows; in first step we form rapidly cooled condensates form SiO molecular beam and in second step we form Si-C grains from a mixture of the SiO condensates and the C-containing molecules and radicals. SiO molecular beam was ejected from the mixture of SiO_2 + Si in Ta boat by electrical heating at 1,300 ゜c. SiO gas was detected with quadrupole massspectrometer. Rapidly cooled SiO condensates were obtained and analyzed with X ray diffractometer and electron spin resonance (ESR) apparatus. X ray analysis showed that they have glassy structre of Si-O and ESR measurement shows that they have unpaired electrons. They were highly active chemically. They were classified to two types; One was a condensate from SiO molecule gas called "Molecule Frost" and the other condensate was formed from dense SiO gas called "Cluster Frost". When Molecule Frost and Cluster Frost were heated to 400 ゜c , change of their structure were found with IR spectra measurements. They reacted with H_2O easily at -200 ゜c. Using the SiO condensates we will produce Si-C dusts in nect step.

在我们的银河系中，10<micrn>米宽谱的星周尘埃中观察到的星周信封的O-丰富的恒星和11<micrn>米宽谱的富C星的信封中观察到。这些11 <micrn>m的放射物被认为是由硅碳尘引起的。直接由Si-C分子或自由基人工生成Si-C粉尘是困难的。我们假设Si-C粉尘是由含SiO和C的分子和自由基混合而成的。我们尝试如下形成Si-C粉尘：第一步，我们从SiO分子束形成快速冷却的冷凝物，第二步，我们从SiO冷凝物和含C分子和自由基的混合物形成Si-C颗粒。在1,300 ℃的温度下，用电热法从Ta舟中的SiO_2 + Si混合物中喷射出SiO分子束。用四极质谱仪检测SiO气体。用X射线衍射仪和电子自旋共振（ESR）仪对快速冷却的SiO凝聚物进行了分析。X射线衍射分析表明它们具有Si-O玻璃结构，ESR测量表明它们具有不成对电子。它们在化学上非常活跃。它们分为两种类型，一种是由一氧化硅分子气体形成的凝析油，称为“分子霜”，另一种是由致密的一氧化硅气体形成的凝析油，称为“团霜”。分子霜和团簇霜加热到400 ℃时，红外光谱测定发现它们的结构发生了变化。它们在-200 ℃时易与水反应。利用SiO凝聚物，我们将在一步法中产生Si-C粉尘。