...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Planetary and space science >Synthesis of magnesiowlistite nanocrystallites embedded in an amorphous silicate matrix via low energy multiple ion implantations
【24h】

Synthesis of magnesiowlistite nanocrystallites embedded in an amorphous silicate matrix via low energy multiple ion implantations

机译：通过低能量多离子注入在非晶硅酸盐基质中嵌入镁镍镁纳米晶体的合成

获取原文
获取原文并翻译 | 示例
   

获取外文期刊封面封底 >>

       
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

A synthesis process is presented for experimentally simulating modifications in cosmic dust grains using sequential ion implantations or irradiations followed by thermal annealing. Cosmic silicate dust analogues were prepared via implantation of 20-80 keV Fe-, Mg-, and O- ions into commercially available p-type silicon (100) wafers. The as-implanted analogues are amorphous with a Mg/(Fe + Mg) ratio of 0.5 tailored to match theoretical abundances in circumstellar dusts. Before the ion implantations were performed, Monte-Carlo-based ion-solid interaction codes were used to model the dynamic redistribution of the implanted atoms in the silicon substrate. 600 keV helium ion irradiation was performed on one of the samples before thermal annealing. Two samples were thermally annealed at a temperature appropriate for an M-class stellar wind, 1000 K, for 8.3 h in a vacuum chamber with a pressure of 1 x 10-7 torr. The elemental depth profiles were extracted utilizing Rutherford Backscattering Spectrometry (RBS) in the samples before and after thermal annealing. X-ray diffraction (XRD) analysis was employed for the identification of various phases in crystalline minerals in the annealed analogues. Transmission electron microscopy (TEM) analysis was utilized to identify specific crystal structures. RBS analysis shows redistribution of the implanted Fe, Mg, and O after thermal annealing due to incorporation into the crystal structures for each sample type. XRD patterns along with TEM analysis showed nanocrystalline Mg and Fe oxides with possible incorporation of additional silicate minerals.
机译：提出了一种合成过程，用于使用顺序离子注入或照射后进行宇宙粉末颗粒的实验模拟修饰，然后进行热退火。通过将20-80keV Fe - ，Mg-and和Oions注入到市售的P型硅（100）晶片中，通过将溶杂体硅酸盐粉尘类似物制备。植入的类似物是无定形的，Mg /（Fe + Mg）比例为0.5，以匹配外观粉尘中的理论丰富。在进行离子注入之前，使用蒙特卡罗的离子固体相互作用码来模拟硅衬底中的植入原子的动态再分配。在热退火之前在其中一次样品上进行600keV氦离子辐射。在适合于M级卓越风的温度下热退火两种样品，在真空室中为M级恒齿风，8.3小时，压力为1×10-7托。在热退火之前和之后利用Rutherford反向散射光谱（RBS）提取元素深度型材。 X射线衍射（XRD）分析用于鉴定退火类似物中的结晶矿物中的各个相。透射电子显微镜（TEM）分析用于识别特定的晶体结构。 RBS分析显示，由于掺入每个样品类型的晶体结构而导致的植入Fe，Mg和O的再分布。 XRD图案随着TEM分析显示纳米晶体Mg和Fe氧化物，可能掺入另外的硅酸盐矿物质。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号