@article{oai:nagasaki-u.repo.nii.ac.jp:00009560,
 author = {Morimura, Takao and Hasaka, Masayuki and Kondo, Shin-ichiro and Nakashima, Hiromichi and Maeda, Hisamitsu},
 issue = {6},
 journal = {Journal of Electronic Materials},
 month = {Jun},
 note = {Zn- and Ti-doped thermoelectric misfit cobalt oxides Ca 3Co 4-x-y Zn x Ti y O 9 (x = 0 to 0.5, y = 0 to 0.5) were prepared by solid-phase reaction, followed by uniaxial compression molding and sintering at 1173 K for 20 h. Powder x-ray diffraction (XRD) data suggest that Zn and Ti dopants substitute in the rocksalt layer rather than in the CoO 2 layer for x ≤ 0.1 and y ≤ 0.1, respectively. In Zn and Ti single-doped samples for x ≤ 0.1 and y ≤ 0.1, ZT at room temperature increased with x and y through an increase in the absolute Seebeck coefficient despite a decrease in electrical conductivity. In Zn and Ti double-doped samples, minor phases other than the misfit oxides were observed at approximately x + y ≥ 0.1. At x ≤ 0.1 and y ≤ 0.1, double doping improved the thermoelectric properties. ZT at room temperature reached a maximum value of 0.035 at (x, y) = (0.1, 0.03)., Journal of Electronic Materials, 41(6), pp.1217-1221; 2012},
 pages = {1217--1221},
 title = {Microstructures and Thermoelectric Properties of Sintered Ca3Co4O9-Based Oxide},
 volume = {41},
 year = {2012}
}