Abstract The synthesis of potassium titanate by treatment of TiO 2 with molten mixtures of KNO 3 and KOH was investigated. The stage of TiO 2 transformation into potassium titanate depends on the temperature of treatment, contents of KOH in the molten salt mixture and admixtures of K 2CO 3. The investigation of the chemical and phase composition as well as the size distribution of the powder produced allowed to consider the product obtained as a potassium polytitanate. The mechanism of the potassium polytitanate synthesis is analyzed. It is shown that the synthesized powder is a promising precursor to produce ceramics based on K 2Ti 6O 13 and characterized with high mechanical properties.