OBSERVATION AND EXPLANATION OF THE REVERSIBLE PRESSURE-INDUCED AMORPHIZATION OF CA(NO3)2/NANO3

被引：22

作者：

WINTERS, RR ^{[1
]}

SERGHIOU, GC ^{[1
]}

HAMMACK, WS ^{[1
]}

机构：

[1] CARNEGIE MELLON UNIV, DEPT CHEM ENGN, PITTSBURGH, PA 15213 USA

来源：

PHYSICAL REVIEW B | 1992年 / 46卷 / 05期

关键词：

D O I：

10.1103/PhysRevB.46.2792

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

X-ray and Raman measurements show that crystalline Ca(NO3)2/NaNO3 becomes amorphous above a pressure of 9.4 GPa. Upon release of the pressure, the crystalline state returns. We report reversible pressure-induced amorphization for a substance that can be prepared as a melt-quenched glass at ambient pressure. We suggest a mechanism for the amorphization based on the formation of a noncrystallographic packing of polytetrahedral units. A consideration of several pressure-induced amorphizations indicates that polytetrahedral amorphization mechanisms are appropriate for nondirectionally bonded materials, but are not appropriate for solids where covalent and hydrogen bonding predominates. Polytetrahedral ordering provides a link between amorphous states formed by compression and those formed by more conventional methods at ambient pressure (e.g., melt quenching).

引用

页码：2792 / 2797

页数：6

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