The phase composition, thermal coefficient of linear expansions (TCLE) and electrical conductivity of (PrXLa1-X)1.85Sr0.15Ni0.9Сu0.1O4 (X=0.0; 0.1; 0.5; 0.9 и 1) (X=0.0; 0.1; 0.5; 0.9 and 1), Pr1-YSrYNiO4 (Y= 0.0; 0.05; 0.1; 0.15; 0.16 and 0.2) and Pr1.84Sr0.16Ni1-ZCuZО4 (Z=0.0; 0.1; 0.5 and 1) are investigated at air in the temperature range 100–1000 °C.The thermal coefficient of linear expansion of (Pr1-XLaX)2-YSrYNi1-ZCuZO4 are in range of (11.6–16.3) 10-6 deg-1 and depends on the size and type of addition.
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