TY - GEN
T1 - The role of chemical composition and mean coordination number in Ge-As-Se ternary glasses
AU - Wang, Rong Ping
AU - Choi, Duk Yong
AU - Madden, Steve
AU - Luther-Davies, Barry
PY - 2012
Y1 - 2012
N2 - We prepared a series of Ge-As-Se glasses with different chemical compositions and mean coordination numbers (MCN) from 2.2 to 2.94. We further measured their physical properties in order to understand the effect of MCN and chemical compositions on the physical properties of the glasses. It was found that, while glass transition temperatures, Tg, in the glasses with stoichiometric compositions generally increase linearly with increasing MCN, they depart from the linear behaviour in the glasses with high MCN >2.6 and low MCN<2.4. The fluctuation of Tg is less than 5% in the glasses with the same MCN of 2.5 but different chemical compositions. On the other hand, the density and elastic moduli of the glasses show two transition thresholds at MCN=2.45 and 2.65, respectively. The glasses with the same MCN of 2.5 but different chemical compositions show a change of 3% in density and 5% in elastic moduli, respectively. All these results suggest that, in a region from MCN=2.4 to 2.55, MCN could be a primary factor to determine the physical properties of the ternary glasses.
AB - We prepared a series of Ge-As-Se glasses with different chemical compositions and mean coordination numbers (MCN) from 2.2 to 2.94. We further measured their physical properties in order to understand the effect of MCN and chemical compositions on the physical properties of the glasses. It was found that, while glass transition temperatures, Tg, in the glasses with stoichiometric compositions generally increase linearly with increasing MCN, they depart from the linear behaviour in the glasses with high MCN >2.6 and low MCN<2.4. The fluctuation of Tg is less than 5% in the glasses with the same MCN of 2.5 but different chemical compositions. On the other hand, the density and elastic moduli of the glasses show two transition thresholds at MCN=2.45 and 2.65, respectively. The glasses with the same MCN of 2.5 but different chemical compositions show a change of 3% in density and 5% in elastic moduli, respectively. All these results suggest that, in a region from MCN=2.4 to 2.55, MCN could be a primary factor to determine the physical properties of the ternary glasses.
UR - http://www.scopus.com/inward/record.url?scp=84866467110&partnerID=8YFLogxK
U2 - 10.1002/9781118472590.ch28
DO - 10.1002/9781118472590.ch28
M3 - Conference contribution
SN - 9781118273746
T3 - Ceramic Transactions
SP - 233
EP - 238
BT - Processing, Properties, and Applications of Glass and Optical Materials - Proceedings of the 9th International Conference on Advances in the Fusion and Processing of Glass, AFPG9
PB - American Ceramic Society
T2 - 9th International Conference on Advances in the Fusion and Processing of Glass, AFPG9 and Symposium 15 - Structure, Properties and Photonic Applications of Glasses Held during PACRIM-9
Y2 - 10 July 2011 through 14 July 2011
ER -