Abstract
The dependence of the structural phase transition behavior of Nd 2NiO 4 + δ between the tetragonal and orthorhombic phases on the oxygen partial pressure, P(O 2), has been investigated by differential scanning calorimetry, DSC, and thermogravimetry and differential thermal analysis, TG-DTA. The structural phase transition temperature, T P, decreased with decreasing P(O 2), while the variations of enthalpy, Δ H, entropy, Δ S, estimated from the peak area of DSC signals and oxygen content at the phase transition, Δ δ, determined from TG curves, exhibited little dependence on P(O 2). From the relationship between T p and P(O 2), the variations of standard enthalpy, Δ H°, and entropy, Δ S°, at the phase transition have been evaluated. By considering Δ δ, Δ H° and Δ S° exhibited fair agreement with Δ H and Δ S evaluated by DSC.
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