Phase formation and magnetotransport of alkali metal doped Na[sub 0.75]CoO[sub 2] thermoelectric oxide

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Journal Title
Journal ISSN
Volume Title
School of Chemical Technology | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2010
Major/Subject
Mcode
Degree programme
Language
en
Pages
09D716/1-3
Series
Journal of Applied Physics, Volume 107, Issue 9
Abstract
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.
Description
Keywords
alkali metals, magnetoresistance, doping, sintering, sodium
Other note
Citation
Jood, P. & Peleckis, G. & Wang, X. L. & Dou, S. X. & Yamauchi, H. & Karppinen, Maarit. 2010. Phase formation and magnetotransport of alkali metal doped Na[sub 0.75]CoO[sub 2] thermoelectric oxide. Journal of Applied Physics. Volume 107, Issue 9. 09D716/1-3. ISSN 0021-8979 (printed). DOI: 10.1063/1.3365491.