β-(Bi1-xSbx)8Pb5O17has been shown to have very high oxygen-ion conductivity at temperatures as low as 600°C; 1 s/cm has been reported in the literature. This paper describes how the material can be characterised using high temperature Raman spectroscopy. The effect of increasing x allows for a broadening of the peaks in the Raman spectra and a shift towards lower wavenumber. This can be explained in terms of the Sb atom deforming the room temperature tetragonal β-structure and an incipient phase change in the high temperature β-phase. This paper also describes the effect of low oxygen partial pressure on the sample. In general, as x increases, the width of the ionic domain, and hence the low Po2stability, increases down to approximately Po2= 10-13atmospheres. Below this dopant concentration, the stability again reduces.
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