Magnetic and thermoelectric properties of layered Li{sub x}Na{sub y}CoO{sub 2}

Journal Article · Thu Nov 15 04:00:00 EST 2007 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2007.09.002· OSTI ID:21043745

Bos, J W.G. , ^[1]; Hertz, J T; Morosan, E; Cava, R J ^[1]

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1. Department of Chemistry, Princeton University, Princeton, New Jersey 08544 (United States)

The magnetic, thermoelectric, and structural properties of Li{sub x}Na{sub y}CoO{sub 2}, prepared by intercalation and deintercalation chemistry from the thermodynamically stable phase Li{sub 0.41}Na{sub 0.31}CoO{sub 2}, which has an alternating Li/Na sequence along the c-axis, are reported. For the high Li-Na content phases Li{sub 0.41}Na{sub 0.31}CoO{sub 2} and Li{sub 0.40}Na{sub 0.43}CoO{sub 2}, a sudden increase in susceptibility is seen below 50 K, whereas for Li{sub 0.21}Na{sub 0.14}CoO{sub 2} an antiferromagnetic-like transition is seen at 10 K, in spite of a change from dominantly antiferromagnetic to dominantly ferromagnetic interactions with decreasing alkali content. The Curie constant decreases linearly with decreasing alkali content, at the same time the temperature-independent contribution to the susceptibility increases, indicating that as the Co becomes more oxidized the electronic states become more delocalized. Consistent with this observation, the low alkali containing phases have metallic-like resistivities. The 300 K thermopowers fall between 30 {mu}V/K (x+y=0.31) and 150 {mu}V/K (x+y=0.83). - Graphical abstract: The ordered layered arrangement of Li{sup +} and Na{sup +} ions between CoO{sub 2} sheets.

• OSTI ID: 21043745
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 11 Vol. 180; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
ANTIFERROMAGNETISM
COBALT OXIDES
INTERACTIONS
LITHIUM COMPOUNDS
LITHIUM IONS
SODIUM COMPOUNDS
SODIUM IONS
TEMPERATURE RANGE 0013-0065 K
TEMPERATURE RANGE 0273-0400 K
THERMOELECTRIC PROPERTIES