峡谷魔鬼lonsdaleite是一种纳米复合材料,含有c/h堆叠无序的钻石和二石
Péter Németh1,2, Laurence A J Garvie3, Christoph G Salzmann4
1Institute for Geological and Geochemical Research, Research Centre for Astronomy and Earth Sciences, Eötvös Loránd Research Network, Budaörsi út 45, Budapest 1112, Hungary.
概括
伦斯代莱特,一个六边形的钻石多态,实际上是无序的钻石和二矿域的纳米复合物. 这些纳米结构在X射线衍射和电子显微镜中创造了以前被误认为六角钻石的特征.
科学领域:
- 材料科学 材料科学 材料科学
- 矿物学是什么?矿物学是什么?
- 晶体学 晶体学是指结晶学.
背景情况:
- 伦斯代莱特是一种六角形钻石多态体,于1967年从石颗粒中使用X射线衍射 (XRD) 确定.
- 它独特的六角结构被认为为立方钻石提供了优越的性能,推动了合成努力.
- 以前的鉴定依赖于XRD,传输电子显微镜 (TEM) 和拉曼光谱.
研究的目的:
- 重新评估从峡谷迪亚博石中的隆斯代莱特的结构特征.
- 为了确定以前被称为lonsdaleite的纳米结构材料的真实性质.
- 为了澄清与六角钻石相关的特定XRD和TEM特征的起源.
主要方法:
- 从Canyon Diablo铁石中获得的钻石状颗粒的高级分析.
- 使用X射线衍射 (XRD) 和传输电子显微镜 (TEM) 进行详细检查.
- 亚纳米尺度域及其相互增长模式的表征.
主要成果:
- 隆斯代莱特颗粒是一种纳米复合材料,而不是一种独特的多态.
- 该材料主要由亚纳米尺度立方/六角叠加无序的钻石和二矿域主导.
- 这些纳米结构域解释了先前观察到的XRD和TEM特征,这些特征归因于lonsdaleite.
结论:
- 之前定义的矿物lonsdaleite不存在作为一个独特的六边形钻石多态.
- 归因于隆斯代莱特的观察特征源于纳米结构无序的钻石和石墨.
- 这一发现需要重新解释以前对六角钻石和相关材料的研究.
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