块体合金玻璃的时效、脆性和可逆窗口
Aging, Fragility and Reversibility Window in Bulk Alloy Glasses
摘要:
PxGexSe 1 -2x三元体系玻璃化转变Tg(x)的非可逆弛豫谱(DHnr)在0.09 < x < 0.145范围内显示出宽、尖和深的全局最小值(~ 0),在该范围内Tg变为热可逆的。在该可逆性窗口中,发现玻璃不老化,这与在窗口外观察到的易碎玻璃组合物的老化相反。热可逆性和缺乏老化似乎是分子玻璃与蛋白质结构共享的自组织范例,其分别在Tg和折叠温度附近重复和可逆地改变构象。
英文摘要:
Non-reversing relaxation enthalpies (DHnr) at glass transitions Tg(x) in the PxGexSe1-2x ternary display wide, sharp and deep global minima (~ 0) in the 0.09 < x < 0.145 range, within which Tgs become thermally reversing. In this reversibility window, glasses are found not to age, in contrast to aging observed for fragile glass compositions outside the window. Thermal reversibility and lack of aging seem to be paradigms of self-organization which molecular glasses share with protein structures which repetitively and reversibly change conformation near Tg and the folding temperature respectively.
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