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New misfit-layered cobalt oxide (CaOH)1.14CoO2
Authors:Mitsuyuki Shizuya  Yuji Baba  Takuro Nagai  Minoru Osada  Kosuke Kosuda  Satoshi Takenouchi  Yoshio Matsui  Eiji Takayama-Muromachi
Affiliation:National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
Abstract:
We synthesized a new cobalt oxide (CaOH)1.14CoO2 by utilizing a high-pressure technique. X-ray and electron diffraction studies revealed that the compound has a layered structure that consists of CdI2-type CoO2 layers and rock-salt-type double CaOH atomic layers. The two subcells have incommensurate periodicity along the a-axis, resulting in a misfit-layered structure. From resistivity and Seebeck coefficient measurements, we have shown that the two-dimensional (2-D) variable-range hopping (VRH) regime with hole conduction is dominant at low temperature for this compound. As temperature increases, the conduction mechanism undergoes crossover from the 2-D VRH regime to a thermal activation-energy-type regime.
Keywords:Layered cobalt oxide   Thermoelectric oxide   New-material design   Electron microscopy   Seebeck coefficient   Variable-range hopping
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