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Phase Trapping in Acetonitrile, a Metastable Mineral for Saturn’s Moon Titan
ACS Earth and Space Chemistry ( IF 2.9 ) Pub Date : 2020-07-08 , DOI: 10.1021/acsearthspacechem.0c00105
Ka Yik Choi 1 , Samuel G. Duyker 1, 2 , Helen E. Maynard-Casely 3 , Brendan J. Kennedy 1
Affiliation  

Acetonitrile has been observed within the atmosphere of Titan, Saturn’s largest moon, and as a result, it is assumed that it will be a significant surface solid (mineral) upon Titan. Solid acetonitrile is known to adopt high-temperature (α) and low-temperature forms (β), with the β form assumed to be the stable phase under Titan’s surface conditions. We present experimental evidence (powder X-ray diffraction and differential scanning calorimetry) that on rapid cooling, the high-temperature α form can persist at low temperature, making it a viable mineral species for Titan, analogous to cristobalite (the quenched high-temperature form of silica) on Earth.

中文翻译:

乙腈(土星“月亮泰坦”的亚稳态矿物)中的相捕集

在土星最大的卫星土卫六大气中已经观察到乙腈,因此,可以认为土卫六对土卫六是重要的表面固体(矿物)。已知固态乙腈采用高温(α)和低温形式(β),其中β形式被认为是泰坦表面条件下的稳定相。我们提供的实验证据(粉末X射线衍射和差示扫描量热法)表明,在快速冷却时,高温α形式可以在低温下持续存在,使其成为泰坦的可行矿物,类似于方石英(淬火的高温)。形式)。
更新日期:2020-08-20
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