Colour and chemical stability of bismuth oxide in dental materials with solutions used in routine clinical practice
Fig 9
Raman spectra for treated materials at 24 weeks.
Without added CO2, with untreated Bi2O3 for comparison. (a) For H2O, NaOH and NaCl. The only appreciable effect is for NaOH Dark at 130 cm-1. (b) For HCl and NaOCl. For NaOCl, the signal is weak and diffuse. Reference peak positions shown for BiOCl (above) and Bi2O3 (below).