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THERMAL STABILITY AND TRANSPORT PROPERTIES OF Na_0.495CoO₂ SINGLE CRYSTALS

Z. A. XU

Department of Physics, Zhejiang University, Hangzhou 310027, People's Republic of China

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Y. XU

Department of Physics, Zhejiang University, Hangzhou 310027, People's Republic of China

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X. Z. CHEN

Department of Physics, Zhejiang University, Hangzhou 310027, People's Republic of China

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J. Q. SHEN

Department of Physics, Zhejiang University, Hangzhou 310027, People's Republic of China

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G. H. CAO

Department of Physics, Zhejiang University, Hangzhou 310027, People's Republic of China

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Z. H. GAN

Institute of Refrigeration and Cryogenic Engineering, Zhejiang University, Hangzhou 310027, People's Republic of China

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, and

L. M. QIU

Institute of Refrigeration and Cryogenic Engineering, Zhejiang University, Hangzhou 310027, People's Republic of China

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https://doi.org/10.1142/S0217979206035485Cited by:0 (Source: Crossref)

Abstract

Single crystals of Na_0.495CoO₂ were obtained through a flux method followed by de-intercalation of sodium. The resistivity (ρ) and thermal stability were studied for the de-intercalated samples exposed to humid air. It was found that the de-intercalated Na_0.495CoO₂ crystal is vulnerable to water in the air, and a hydration process in which H₂O molecules fill oxygen vacancies in CoO₂ layers instead of being intercalated between CoO₂ layers is suggested to be responsible for the remarkable change in resistivity induced by water absorption. The Na_0.495CoO₂ sample shows a weak localization of carriers just below 200 K and Co³⁺–Co⁴⁺ charge ordering at about 40 K, lower than the corresponding charge ordering transition temperature reported in Na_0.5CoO₂. The lower charge ordering transition temperature might be caused by the slight deviation of Na content (x) from 0.5.

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