Phase formation and magnetotransport of alkali metal doped Na0.75CoO2 thermoelectric oxide
Фазообразование и магнитотранспорт термоэлектрического оксида Na0.75CoO2, легированного щелочными металлами
2010-04-21
SCID: 54.1/mw3jtmke
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Alkali metal dopingMagnetoresistanceMagnetotransportNaₓCoO₂ thermoelectric oxidePhase formation
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Abstract (AI)
Synthesis and characterization of bulk NaxCoO2 samples substituted by K and Rb is reported. Phase formation studies revealed a narrow stable region for Na-alkali metal-Co system. Whisker and platelike single crystalline structures have been found to form on the surface of the pellets in case of K doping. All samples were metallic and no characteristic anomaly in R-T curves was observed for Rb doped sample. Magnetoresistance measured has a pronounced positive response only for K-doped and pure NaxCoO2 phases, reaching 11% and 7% at 5 K temperature, respectively.
Key Findings
1
All investigated samples exhibited metallic behavior; Rb-doped samples showed no characteristic anomaly in their resistance–temperature curves.
2
K doping produced whisker-like and platelike single-crystalline structures on the pellet surfaces.
3
K- and Rb-substituted bulk NaxCoO2 samples were synthesized and characterized, revealing a narrow stable phase-formation region in the Na–alkali-metal–Co system.
4
Magnetoresistance displayed a pronounced positive response for K-doped and undoped NaxCoO2, reaching 11% and 7%, respectively, at 5 K.
Research Object
bulk NaxCoO2 thermoelectric oxide samples substituted with K and Rb
Research Subject
phase formation, crystal morphology, metallic transport, temperature-dependent resistance, and magnetoresistance of the doped phases
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Publication Date
2010-04-21
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