Caractérisation de la solution solide In 1- xLi 3 xVO 4 (0 < x ≤ 0,4) dans le système InVO 4Li 3VO 4 et examen des systèmes CrVO 4Li 3VO 4 et InVO 4CrVO 4
In the InVO 4Li 3VO 4 system, a continuous solid solution In 1- xLi (6)a□ (6)bLi (4)c□ (6)dVO 4 exists between InVO 4 and In 0.6Li 1.2VO 4, with a + b = x, c + d = 1, and a + c = 3 x. The solid solution is of two types: in the first, 0 < x ≤ 0.33, a = 0, interstitial Li + ions are in the vacant tetrahedral sites of InVO 4; in the second, 0.33 < x ≤ 0.4, c = 1, Li + ions are also in the octahedral sites vacated by In 3+. The ionic conductivity measured for some compositions is weak, 10 -7 (Ω cm) -1 at 493 K. Solid solution has not been found between CrVO 4 and Li 3VO 4, although CrVO 4 is isostructural with InVO 4. Mutual solid solution between CrVO 4 and InVO 4 is extremely limited. Yellow and weakly hygroscopic monocrystals have been synthetized for R2Li 3(VO 4) 3 compositions ( R = In,Cr,Fe); their chemical formula can be symbolized by LiVO 3: R3+. The R3+ percentage was too low to be detected by analysis of electronic densities based on X-ray diffraction intensities.