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The non-stoichiometric compositions Ln2-xNiO4-3x/2+ (Ln=La, Pr, Nd, 0x0,4) were obtained using coprecipitation method from nitrates solutions by K2CO3 followed by calcination of the obtained blend at 950С. According to X-ray phase analysis compositions in the range La2NiO4.17 -La1.6NiO3.63 are monophase and crystallize in tetragonal symmetry K2NiF4, space group I4/mmm. Nd2-xNiO4-y and Pr2-xNiO4-y in the range 0x0,2 are monophase and have orthorombic and monoclinic(correspodingly) distorted K2NiF4 structure. Samples with 0,2

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