Synthesis and Properties of Ca₃Co_4-xCu_xO₉ (0≤x≤1.4)

Abstract:

Ca₃Co_4xCu_xO₉ (0x1.4) misfit-layered thermoelectric oxides were prepared by traditional solid-state reaction method which cost less, operate easer, may produce Ca₃Co₄O₉ on large scale. XRD study shows that we obtain Ca₃Co₄O₉ major phase in series Ca₃Co_4xCu_xO₉ (0x1.4) samples which were sintered at the highest temperature 880°C for 8h by two steps. Metallographic microscopic analysis indicates that some samples grain size range at 2~4μm which were doped less Cu. Doping Cu in different way experiment suggests that Ca₃Co_4xCu_xO₉ (x=0.4) sample has lower electric resistivity while Ca₃Co₄O₉+5%Cu samples resistivity increases, compared with Ca₃Co₄O₉ (x=0). The article infers that Ca₃Co_4xCu_xO₉ (0x0.4) can decrease the electric resistivity of Ca₃Co₄O₉.

• Periodical: Advanced Materials Research (Volume 749)
• Pages: 13-17
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.749.13
• Online since: August 2013
• Authors: Yin Liang, Lei Wang, Kun Yu Zhao, Zhi Dong Li, Xue Lian Tang
• Keywords: Ca₃Co₄O₉, Cu Substitution for Co, Electric Resistivity, Thermoelectric Material

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