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- W1980585168 abstract "Heat capacities of ${mathrm{La}}_{2}{mathrm{NiO}}_{4+ensuremath{delta}}$ crystals were measured in the temperature range 14--400 K and composition range $0.120<~ensuremath{delta}<~0.154$ with an adiabatic calorimeter. Heat-capacity anomalies were observed in the range 240--360 K due to positional order-disorder phase transitions of excess oxygen atoms. The phase relation showed phase separations of eutectoid and peritectoid types in the ranges $0.10<ensuremath{delta}<0.14$ and $ensuremath{delta}>0.14,$ respectively, and the presence of the low-temperature stable phase (designated as the $ensuremath{zeta}$ phase) with $ensuremath{delta}ensuremath{approx}0.14.$ In the low-temperature $ensuremath{zeta}$ phase, in which charge and spin orderings in ${mathrm{NiO}}_{2}$ planes have been reported, a heat-capacity anomaly was observed at around 100 K due to the cooperative antiferromagnetic spin ordering, but no appreciable heat-capacity anomaly indicating the cooperative charge (hole) ordering was observed. The arrangement of excess oxygen atoms in the $ensuremath{zeta}$ phase and the effect of excess oxygen atoms on the spin and charge orderings are discussed." @default.
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- W1980585168 date "1999-12-01" @default.
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- W1980585168 title "Phase diagram and effect of excess oxygen atoms on the spin and charge ordering inLa2NiO4+δcrystals" @default.
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- W1980585168 doi "https://doi.org/10.1103/physrevb.60.14841" @default.
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