[en] Results of investigations into pH effect and component ratio on composition of base phases of In(NO₃)₃-NaVO₃-H₂O and CsNO₃-In(NO₃)₃-NaVO₃-H₂O solution series, are presented. It is determined, that composition of the extracted compounds does not depend on ratio of initial components in the solution and corresponds to 0.5Na₂O·In₂O₃·2.5V₂O₅·8H₂O (1) and 2Cs₂O·In₂O₃·6V₂O₅·7H₂O (2) empirical formulae. 1 formation range is within pH interval equal to 2,5-4,5, 2-within pH range equal to 2,0-3,0. The extracted compounds are studied via IR, NMR spectroscopy, derivatography and X-ray phase analysis, they are considered to have Na(InOH)₂V₅O₁₅·7H₂O (1), Cs₂InOHV₆O₁₇·3H₂O possible formulae composition