Colour and chemical stability of bismuth oxide in dental materials with solutions used in routine clinical practice
Fig 6
XRD patterns from treated powders exposed to added CO2.
Patterns for Dark and Light conditions were averaged for noise reduction, there being no detectable systematic difference between the two. (a) H2O: the subcarbonate is present (‘*’). “0 weeks” = unexposed control. (b) NaOH: subcarbonate formed more strongly. (c) NaCl: subcarbonate again present, along with an unidentified but transient substance (‘?’); a remnant of NaCl is present. (d) NaOCl: bismuthate formed; some oxide remains; unidentified peaks marked ‘?’; a remnant of NaCl is present. (e) HCl: only BiOCl present.