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- W2003285645 abstract "Crystal phases, crystal systems and lattice constants of Nd2NiO4 + δ at δ = 0.106–0.224 have been studied up to 970 K to examine the orthorhombic–tetragonal phase transition of Nd2NiO4 + δ. In the room temperature phase diagram of Nd2NiO4 + δ, two orthorhombic phases are found at δ = 0.13–0.17 and 0.205–0.224 and two mixed phases are found at δ = 0.106 and 0.17–0.205. The (b–a) value of the orthorhombic phase at δ = 0.205–0.224 decreases with decreasing the δ value and is expected to become zero at δ = 0.13. A Rietveld analysis of the phase at δ = 0.106 shows that the phase consists of 90% of an orthorhombic phase and 10% of a tetragonal phase. The excess oxygen will be concerned for the orthorhombic–tetragonal phase transition of Nd2NiO4 + δ. However, between the orthorhombic phase at δ = 0.205–0.224 and the phase at δ = 0.106, another orthorhombic phase, which (b–a) value increases with decreasing the δ value, exists at δ = 0.13–0.17. The concernment of the excess oxygen is not clear. For considering the phase transition, the orthorhombic phase just below the phase transition temperature is the phase at δ = 0.205–0.224 or the phase at δ = 0.13–0.17 is important. The phase transition temperature of Nd2NiO4 + δ is 880–890 K in air, and at 760–860 K the (b–a) value increases with increasing the oxygen partial pressure, that is, with increasing the δ value. The orthorhombic phase at 760–860 K is not the phase at δ = 0.13–0.17 but is likely the phase at δ = 0.205–0.224. The phase transition of Nd2NiO4 + δ should be caused by the decrease of the δ value due to the increase of temperature." @default.
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- W2003285645 date "2006-02-01" @default.
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- W2003285645 title "Structural phase transition of Nd2NiO4+δ (0.106≤δ≤0.224)" @default.
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- W2003285645 doi "https://doi.org/10.1016/j.jallcom.2004.12.201" @default.
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