Abstract
NdBaCo 2− x Fe x O 5+δ (0.0 ≤ x ≤ 2.0) series were prepared by a solid state reaction. Singe phase solid solutions were obtained within the range 0.0 ≤ x ≤ 1.4. The crystal structure of iron substituted solid solutions NdBaCo 2− x Fe x O 5 + δ was described within the tetragonal unit cell a p × a p × 2a p (S.G. P4/mmm). The substitution of cobalt for iron leads to the monotonous increase of the unit cell parameters and the unit cell volume. The values of the oxygen content in NdBaCo 2− x Fe x O 5 + δ ( x = 0; 0.2) as a function of temperature were determined by TGA. The thermal expansion measurements of NdBaCo 2− x Fe x O 5 + δ ( x = 0; 0.2; 0.4; 0.6 and 0.8) were performed. Chemical expansion constituent was separated.
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