Sn And Nb in Dry And Fluid-Rich (H(2)O, F) Silicate Glasses
The speciation of niobium and tin in 29 silicate glasses was investigated by XAFS at the Nb and Sn K-edges using beamline 4-3 and 11-2 at SSRL (Stanford, USA). The metal content in the glasses varies between 100 ppm and 5 wt.% (to examine the effects of Nb{sub 2}O{sub 5} and SnO{sub 2} saturation in the melt composition prior quenching). The glasses show variation in composition from peralkaline to peraluminous, with either zero or {approx}2 wt.% fluorine. In addition, hydrous glasses were quenched from water-saturated melts at 850 C and 2 kbar under relatively reducing conditions. Three 'haplogranitic' compositions (a model granite in the system Na{sub 2}O-K{sub 2}O-AlO{sub 3}-SiO{sub 2}) were investigated: peralkaline (labeled 'ASI 0.6'), metaluminous ('ASI 1.0') and peraluminous ('ASI 1.2'). One series of haplogranitic glasses ('SQ') were synthesized at intermediate oxygen fugacity conditions ({approx}10{sup -9} atm.). In addition, 15 model oxide and silicate compounds of tin and niobium were investigated.
- Research Organization:
- Stanford Linear Accelerator Center (SLAC)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC02-76SF00515
- OSTI ID:
- 894123
- Report Number(s):
- SLAC-REPRINT-2005-309
- Journal Information:
- Phys.Scripta T115:405,2005, Journal Name: Phys.Scripta T115:405,2005
- Country of Publication:
- United States
- Language:
- English
Similar Records
Hafnium in peralkaline and peraluminous boro-aluminosilicate glass, and glass subcomponents: a solubility study.
Fluorine in silicate glasses: A multinuclear nuclear magnetic resonance study