GeAsSe

CHAPTER 11. INTERCHANGEABEE GROUND-GEASS JOINTS, STOPCOCKS Joint Design Making Joints Grinding... 

The As2S3-Na2S system shows evidence of formation of NaAsS2 and Na3AsS3, ° while in the Ge-As-Se system the ternary species GeAsSe and GeAs4Se have been identified. 

GeAsSe (amorphous) 0.909 16.00 11000 625 3188 181 2.50 AMUR (Amorphous Material Transmitting IR) is a glass insoluble in water resistant to corrosion. 

Se (amorphous selenium) InP (indium phosphide) GeAsSe (amorphous) MgAl204 (spinel)... 

ZrCuAINi GeAsSe A soda-lime Soda-lime (5) u n... 

Figure 7. Reduced hardness as a function of the reduced temperature Vickers indentation under 0.98 N for the GeAsSe glass and under 4.91 N for the other glasses, with a loading duration of 30 s. ...

Raman vibrational frequencies as a function of MCN in GeAsSe glasses. Reprinted with permission from Wang, R. R, Smith, A., Prasad, A., et al., Raman spectra of Ge,jASj,Sei, j j, glasses,/. Appl. Phys. 106(4], 043520-5 (2009). Copyright (2009), AIR Publishing LLC. 

Convincing evidence of the correlation of elastic transitions with the MCN comes from measurements on the GeAsSe and GeAsS systems, where the bulk moduli in these two different glass systems show the same trends [29,100]. The elastic modulus first increases with the MCN below 2.4. Beyond MCN = 2.4 there is first a saturation followed by a sharp rise beyond MCN = 2.7. The results for GeAsSe glasses are shown in Fig. 4.14, where the elastic transitions at 2.4 and 2.7 are quite evident. 

Zha C., Wang R. R, Smith A., Prasad A, Jarvis R. A., and Luther-Davies. B., Optical properties and structural correlations of GeAsSe chalcogenide glasses,/. Mater. Set Mater. Electron., 18, s389-s392 (2007). 

Wang Y., Boolchand R, and Micoulaut M., Glass structure, rigidity transitions and the intermediate phase in the GeAsSe ternary, Europhys. Lett., 52, 633-639 (2000). 

Bonding structural units in isocoordinate GeAsSe glasses of increasing Ge and Se concentration. 

Opletal G., Wang R. P. and Russo S. R, Investigation of bonding within ab-initio models of GeAsSe glasses, Chem. Phys. Lett., 575, 97-100 (2013). 

Orthorhombic GeAsSe obviously crystallizes also in a layer structure [1052]. This Mooser-Pearson phase may contain As—As pairs in order to saturate the bonds. 

Standard glass 0- Standard glass [SENB, Rouxel Sangleboeuf] GeAsSe ... 

Figure 8.19 Mean fracture toughness (error bar = +SD) as a function of temperature for soda-lime-silica glass and GeAsSe glass (Tg = 550 and 280 °C respectively)- Ihe indentation values for soda-lime-silica glass are compared to values obtained on chevron-notched bars (Rouxel and Sangleboeuf, 2000)...

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