A low-temperature amorphous phase in a fragile glass-forming substance
A low-temperature amorphous phase in a fragile glass-forming substance
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DOI：
10.1021/jp953785h
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发表时间：
1996-05-16
影响因子：
--
通讯作者：
Kivelson, D
中科院分区：
文献类型：
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作者：
Cohen, I;Ha, A;Kivelson, D
我们观察到似乎是一级相的变化，从深度过冷的液体三苯基亚磷酸酯在1atm到一个刚性的，“显然”无定形的相，我们称之为“冰川相”。这是一种新的、更清晰的、相当不同的、最近被研究过的多态例子的补充。为了“深度”过冷液体，必须将其快速淬火到低温：如果缓慢加热，但立即加热，它就会结晶；如果在低温下放置几个小时，它就会转变为冰期；如果随后加热，它也会结晶，但在比液体结晶更高的温度下。冰期可以从普通水晶和普通玻璃中清楚地区分出来。我们提出了这个“显然”无定形冰期形成的模型。
We have observed what appears to be a first-order phase change from deeply supercooled liquid triphenyl phosphite at 1 atm to a rigid, ''apparently'' amorphous phase which we denote as the ''glacial-phase''. This is a new, crisper, and rather different addition to the examples of polyamorphism that have recently been studied. In order to ''deeply'' supercool the liquid, it must be quick-quenched to a low temperature: if heated slowly, but immediately, it crystallizes; if allowed to stand for several hours at low temperature, it transforms to the glacial phase; and if subsequently heated it, too, crystallizes, but at a higher temperature than that for liquid crystallization. The glacial phase can be clearly distinguished from both the normal crystal and the ordinary glass. We propose a model for the formation of this ''apparently'' amorphous glacial phase.