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首页> 外文期刊>The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical >Raman Scattering Investigations of the Stable and Metastable Phases of Cyanoadamantane Glassy Crystal
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Raman Scattering Investigations of the Stable and Metastable Phases of Cyanoadamantane Glassy Crystal

机译：氰金刚烷玻璃态晶体的稳定相和亚稳相的拉曼散射研究

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摘要

We report Raman investigations on stable and metastable phases of cynaoadamantane plastic crystal, which gives an orientational glassy state upon a deep undercooling below 175 K. The isothermal transformation of the metastable quenched plastic phase is systematically analyzed for quenches in the 180-250 K temperature range. Two different kinds of ordering process have been evidenced, depending on the depth of the quench. For shallow quenches (above 200 K) the ordering process is characterized by sigmoidal growth curves corresponding to the nucleation and growth of the ultimately stable state. For deep quenhces (below 200 K), atypical kinetics laws are observed. In this case the system escapes from its metstable disordered state preferentially via the transient development of domains whose structure slightly differs from that observed in the ultimately stable phase, in agreement with Ostwald's rule of stages. The development of this local structure, after quenches at temperatures approaching T_g, is considered to be responsible for the extension of the lifetime of the metastability of the plastic phase and then could be at the origin of the glass formation.
机译：我们报告了氰基金刚烷塑料晶体的稳定和亚稳态相的拉曼研究，其在低于175 K的深度过冷时会产生取向玻璃态。系统地分析了亚稳态淬火塑料相的等温转变，以了解180-250 K温度范围内的淬灭。已经证明了两种不同类型的排序过程，具体取决于淬火的深度。对于浅淬火（大于200 K），有序过程的特征在于S型曲线，该曲线对应于最终稳定态的形核和生长。对于深淬火（低于200 K），观察到非典型动力学定律。在这种情况下，系统优先通过结构域与最终稳定阶段所观察到的结构略有不同的域的瞬态发展摆脱其稳定的无序状态，这与奥斯特瓦尔德的阶段法则相符。在接近T_g的温度淬火后，这种局部结构的发展被认为是塑性相亚稳态寿命延长的原因，然后可能是玻璃形成的起点。

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