To study the ambient stability of the synthesized alloys, they were exposed to air and their XRD patterns were measured after several time intervals. Pure titanium VODPs were found to decompose within the time of the XRD measurement (around 10 minutes), so that only CsBr and CsI (for the bromide and iodide respectively) are visible when measuring their XRD in air (Figure ). Focusing on the bromide alloys, with the 23% and 44% tin compositions, CsBr diffraction peaks appeared from the first minutes of air exposure. At this point the VODP peaks are still visible, though slightly shifted to lower angles suggesting a preferential loss of Ti over Sn from the mixed structure (Figure ). As expected, when the tin content is increased to 60%, the stability increases significantly to 5-8 hours in air (Figure ).