Melt Homogenization and Self-Organization in Chalcogenides-Part II

被引:71
作者
Bhosle, Siddhesh [1 ]
Gunasekera, Kapila [1 ]
Boolchand, Punit [1 ]
Micoulaut, Matthieu [2 ]
机构
[1] Univ Cincinnati, Coll Engn & Appl Sci, Sch Elect & Comp Syst, Cincinnati, OH 45221 USA
[2] Univ Paris 06, Lab Phys Theor Mat Condensee, F-75252 Paris 05, France
基金
美国国家科学基金会;
关键词
ELASTIC PROPERTIES; RIGIDITY PERCOLATION; INTERMEDIATE PHASE; GLASS-TRANSITION; FRAGILITY; PHYSICS; ORIGIN; WINDOW; GESE2; ORDER;
D O I
10.1111/j.2041-1294.2012.00092.x
中图分类号
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
The compositional variation of the non-reversing enthalpy at T-g, Delta H-nr(x), in GexSe100-x glasses decreases abruptly by an order of magnitude as x increases to x(c)(1) = 19.5(5)%, the rigidity transition, and then remains minuscule till x increases to x(c)(2) = 26.0(5)%, when the term abruptly increases by an order of magnitude as glasses become stressed-rigid. The rigid but unstressed networks formed in between these two transitions represent the Intermediate Phase (IP). The square-well like variation of Delta H-nr(x), also known as the reversibility window develops sloping walls, then a triangular shape and eventually disappears as glasses of increasing heterogeneity are studied. The Delta H-nr term ages over weeks outside the IP but not inside the IP. Raman line shapes of as-quenched melts are quite similar to those of T-g-cycled glasses for compositions in the IP, but not outside the IP- an optical analog of the thermal reversibility window. Variations of Molar volumes, display a global minimum in the IP and a pronounced increase outside that phase. Physical behavior of dry and homogeneous chalcogenide glasses that leads to sharp elastic and chemical phase transitions remains to be understood theoretically. The physics of network may be even more interesting than hitherto recognized.
引用
收藏
页码:205 / 220
页数:16
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