Change in the crystal structure of germanium-containing lithiophosphate upon heating

The crystal structure of lithiophosphate with phosphorus atoms partially replaced by germanium, Li3.17(P0.69Ge0.24Mo0.07)O4, at temperatures of 25, 150, 300, 450, and 600°C has been refined by the Rietveld method using powder data. New additional Bragg reflections are observed at T = 600°C, which indicate a change in the crystal structure of this compound.