Re-examining the crystal structure behaviour of nitrogen and methane

被引：11

作者：

Maynard-Casely, Helen E. ^{[1
]}

Hester, James R. ^{[1
]}

Brand, Helen E. A. ^{[2
]}

机构：

[1] Australian Nucl Sci & Technol Org, Locked Bag 2001, Kirrawee Dc 2232, Australia

[2] ANSTO, Australian Synchrotron, 800 Blackburn Rd, Clayton, Vic 3168, Australia

来源：

IUCRJ | 2020年 / 7卷

关键词：

molecular crystals; Pluto; thermal expansion; phase transitions; solid properties; methane; simple crystal structures; X-RAY-DIFFRACTION; THERMAL-EXPANSION; SOLID NITROGEN; REFINEMENT; DYNAMICS; NUCLEAR;

D O I：

10.1107/S2052252520007460

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

In the light of NASA's New Horizons mission, the solid-phase behaviour of methane and nitrogen has been re-examined and the thermal expansion coefficients of both materials have been determined over their whole solid temperature range for the first time. Neutron diffraction results indicate that the symmetric Pa (3) over bar space group is the best description for the alpha-nitrogen structure, rather than the long-accepted P2(1)3. Furthermore, it is also observed that beta-nitrogen and methane phase I show changes in texture on warming, indicating grain growth.

引用

页码：844 / 851

页数：8

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