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- W2044186017 abstract "Three methods were used for the synthesis of LiAl{sub y}Ni{sub 1-y}O{sub 2} solid solutions with layered crystal structure: citrate and hydroxide precursor methods at atmospheric pressure and high-pressure synthesis in oxygen-rich atmosphere (3GPa). Structural characterization of the oxides was performed by powder XRD analysis and electron paramagnetic resonance (EPR) spectroscopy. Irrespective of the different preparation techniques used, it was found that LiAl{sub y}Ni{sub 1-y}O{sub 2} solid solutions can be formed in the limited concentration range of 0=<y=<0.5 and 0.75=<y=<1.0. The unit cell parameter a decreases linearly with the Al content whereas the unit cell parameter c increases sharper as compared to the linear interpolation of the c parameter calculated for the two end compositions LiNiO{sub 2} and LiAlO{sub 2}. In these compositions, aluminum substitutes for Ni in the NiO{sub 2}-layer, the mean Al{sub y}Ni{sub 1-y}-O bond length decreasing. The extent of the trigonal distortion of Al{sub y}Ni{sub 1-y}O{sub 6} and LiO{sub 6}-octahedra varies with the aluminum content and depends on the synthesis procedure used. The LiO{sub 6}-octahedra are more flexible to tolerate the increased trigonal distortion as compared to the Al{sub y}Ni{sub 1-y}O{sub 6}-octahedra. High-pressure synthesis favors the formation of oxides with a higher extent of trigonal distortion of bothmore » Al{sub y}Ni{sub 1-y}O{sub 6} and LiO{sub 6}-octahedra. From EPR measurements, it was shown that local cationic distribution in LiAl{sub y}Ni{sub 1-y}O{sub 2} depends on the synthesis temperature. At atmospheric pressure, higher synthesis temperatures promote the reaction of cation mixing between the layers.« less" @default.
- W2044186017 created "2016-06-24" @default.
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- W2044186017 date "2006-10-01" @default.
- W2044186017 modified "2023-09-26" @default.
- W2044186017 title "Formation of LiAlyNi1−yO2 solid solutions under high and atmospheric pressure" @default.
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- W2044186017 doi "https://doi.org/10.1016/j.jssc.2006.06.011" @default.
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