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Self-organization and stress in netw...

Wang, Fei.

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Self-organization and stress in network glasses.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Self-organization and stress in network glasses./
作者:	Wang, Fei.
面頁冊數:	172 p.
附註:	Source: Dissertation Abstracts International, Volume: 66-03, Section: B, page: 1521.
Contained By:	Dissertation Abstracts International66-03B.
標題:	Physics, Condensed Matter. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3168750
ISBN:	0542053187

Self-organization and stress in network glasses.
Wang, Fei.

Self-organization and stress in network glasses. - 172 p.

Source: Dissertation Abstracts International, Volume: 66-03, Section: B, page: 1521.

Thesis (Ph.D.)--University of Cincinnati, 2005.

Raman pressure measurements on GexSe1-x glasses using Diamond Anvil Cells show onset of a steady increase in the frequency of modes of corner-sharing GeSe4 tetrahedra when the external pressure P exceeds a threshold value (Pc). The threshold pressure Pc(x) decreases with x to nearly zero for 0.20 < x < 0.25, then increases up to x = 1/3. Pc indicates the presence of local stress at the Raman active units; so its vanishing suggests that these units are part of an isostatically rigid backbone. Isostaticity also accounts for the non-aging behavior of glasses observed in this same composition range.

ISBN: 0542053187Subjects--Topical Terms:

1018743
Physics, Condensed Matter.

Self-organization and stress in network glasses.
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500 $a Source: Dissertation Abstracts International, Volume: 66-03, Section: B, page: 1521.
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502 $a Thesis (Ph.D.)--University of Cincinnati, 2005.
520 $a Raman pressure measurements on GexSe1-x glasses using Diamond Anvil Cells show onset of a steady increase in the frequency of modes of corner-sharing GeSe4 tetrahedra when the external pressure P exceeds a threshold value (Pc). The threshold pressure Pc(x) decreases with x to nearly zero for 0.20 < x < 0.25, then increases up to x = 1/3. Pc indicates the presence of local stress at the Raman active units; so its vanishing suggests that these units are part of an isostatically rigid backbone. Isostaticity also accounts for the non-aging behavior of glasses observed in this same composition range.
520 $a Chalcohalide Ge25Se75-yIy glasses were synthesized over a wide range (0 < y < 0.40) and examined in Temperature Modulated Differential Scanning Calorimetry (MDSC) and Raman Scattering. The non-reversing enthalpy near the Tg shows an extremely narrow and deep minimum (intermediate phase) centered near yc = 16.0%. The intermediate phase location (yc) is in excellent agreement with mean-field theoretical predictions based on Extended Constraint Counting Algorithms. The observed Tg(y) decrease with I content indicates that iodine alloying lowers the global connectivity by replacing bridging Se atoms by dangling I ends. These observations in conjunction with previous ones on ternary Ge-S-I glasses show that one-fold coordinated atoms play an important role in determining the onset of rigidity.
520 $a Raman scattering on Ge-Se-I glasses permits a quantitative measurement of mixed tetrahedral Ge(Se1/2)4-mIm units. The results show the concentration of the iostatically rigid m = 1 units to display a step-like variation in the range 15.5% < y < 16.4%, that we identify with a narrow intermediate phase with glasses at y < 15.5% as stressed-rigid, while those at y > 16.4% floppy. The observed molecular structural rearrangement (populating the m = 1 units) observed in the intermediate phase provides a means to release network stress. Results on ternary Ge-S-I glasses did not show such a step, we suppose because network stress did not build up because of atomic size mismatch. These results show that there is an intrinsic difference in network stress distribution between ternary Ge-Se-I and Ge-S-I glasses. The stress induced by oversized iodine alloying is much greater in Ge-Se-I glasses than in Ge-S-I glasses because of the bigger size of Se atoms in relation to S atoms. Plus, because of the size and mass mismatch in the Ge-S based glass, iodine alloying induced stress is locally dissipated; on the other hand, in the equi-sized and equi-massed base glass Ge-Se, stress due to the iodine alloying is found to propagate globally.
520 $a Pronounced photo-polymerization effects are observed in floppy (partially polymerized) Ge25Se75-yIy (y > 30%) glasses and floppy GexS1-x (x < 20%) glasses. In the former glasses, GeI4 monomers are decoupled from the backbone can be opened and alloyed in the base glass network upon near-band-gap radiation. In the latter glasses S8 crowns decouple from the back bone and can be opened and alloyed in the base glass likewise.
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650 4 $a Physics, Condensed Matter. $3 1018743
650 4 $a Engineering, Electronics and Electrical. $3 626636
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