TY - GEN
T1 - Effect of TiO2 addition on the distribution of phosphorus associated with phase separation of borosilicate glasses
AU - Ohtsuki, Y.
AU - Sakida, S.
AU - Benino, Y.
AU - Nanba, T.
PY - 2012/1/1
Y1 - 2012/1/1
N2 - Behavior of phosphorus associated with phase separation and the effect of TiO2 addition on the phosphorus distribution were investigated in Na2O-B2O3-SiO2 ternary glass system. After heat treatment, phase separation by spinodal decomposition was commonly observed. In the phase separation of TiO2-free glasses, phosphorus was preferentially distributed into B2O3-rich phase, and after TiO2 addition, phosphorus distribution into SiO 2-rich phase was also observed. With increasing TiO2 content, the amount of phosphorus distributed into SiO2-rich phases increased up to 90%. 31P MAS NMR indicated that phosphorus in the glasses was mainly present in negatively-charged Q2 units with terminal oxygen atoms, and in the TiO2-containing glasses, Q 1 or Q0 units containing P-O-Ti bond were confirmed. Despite the formation of negatively-charged Q1 or Q0 units, phosphorus was distributed into SiO2-rich phase, which was due to the distribution of Ti4+ ions with higher coordination numbers acting as network modifiers.
AB - Behavior of phosphorus associated with phase separation and the effect of TiO2 addition on the phosphorus distribution were investigated in Na2O-B2O3-SiO2 ternary glass system. After heat treatment, phase separation by spinodal decomposition was commonly observed. In the phase separation of TiO2-free glasses, phosphorus was preferentially distributed into B2O3-rich phase, and after TiO2 addition, phosphorus distribution into SiO 2-rich phase was also observed. With increasing TiO2 content, the amount of phosphorus distributed into SiO2-rich phases increased up to 90%. 31P MAS NMR indicated that phosphorus in the glasses was mainly present in negatively-charged Q2 units with terminal oxygen atoms, and in the TiO2-containing glasses, Q 1 or Q0 units containing P-O-Ti bond were confirmed. Despite the formation of negatively-charged Q1 or Q0 units, phosphorus was distributed into SiO2-rich phase, which was due to the distribution of Ti4+ ions with higher coordination numbers acting as network modifiers.
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U2 - 10.1002/9781118472590.ch16
DO - 10.1002/9781118472590.ch16
M3 - Conference contribution
AN - SCOPUS:84866464886
SN - 9781118273746
T3 - Ceramic Transactions
SP - 145
EP - 149
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 -