Abstract: | The reactions between rubidium carbonate and vanadium pentoxide were performed at different high temperatures. Four reaction products of the compositions: I. Rb2O · V2O5; II. 2 Rb2O · V2O5; III. 3 Rb2O · V2O5; and IV. Rb2O · 4 V2O5 were obtained. According to the determination of Rb and the X-ray powder photographs of the products the existence of rubidium metavanadate (RbVO3) and rubidium pyrovanadate (Rb4V2O7) was confirmed. On the other hand, the preparation of a pure rubidium orthovanadate (Rb3VO4) and rubidium tetravanadate (Rb2O · 4 V2O5) was not successful. The diffraction pattern of Rb2O · V2O5 obeys hexagonal indexing with lattice dimensions a = 7.347 and c = 13.608 Å. |