Abstract
Using DTA and X-ray diffraction, two new compounds TlNa2V3O9 and TlLi2V3-O9 have been found in these systems. The thallium metavanadate TlVO3, did not exist under two allotropic forms as found before, in the binary system Tl2O-V2O5. Besides, the interpretation of the thermal effects in the binary system TlVO3-NaVO3 was completely different from a previous one. This may arise from the difference of compounds Synthesis methods used in the two studies. TlNa2V3O9 and TlLi2V3O9 showed a solid state decomposition; their X-ray powder diagrams did not allow to characterize them, because of the continuous presence of the initial compounds TlVO3, and MVO3. The examination of the pyroxene structures types occured in the alkaline metavanadates agreed with the existence of such defined mixed compounds : TlLi2(VO3)3 and TlNa2(VO3)3.
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