Nakatsugawa Lab
Hiroshi Nakatsugawa
中津川 博  Hiroshi NAKATSUGAWA
職   名:准教授
       <学  部>固体電子論、計算材料学

専   門:材料物性
連絡先  :E-mail
● 研究テーマと概要 ●
図1. 酸化物熱電変換素子
図1. 酸化物熱電変換素子
● 主な公表論文 ●
(1)中津川博, 井口栄資, “La0.9(Sr1-xCax)1.1CoO4の熱電変換材料への応用”, 日本金属学会誌,Vol.63pp.1393-1399 (1999).
(2) H. Nakatsugawa and E. Iguchi, “Electronic and Magnetic Properties due to Co ions in La0.9Sr0.1Fe1-xCoxO3”, Journal of Solid State Chemistry, Vol. 159 pp.215-222 (2001).
(3) H.Nakatsugawa and K.Nagasawa, “Evidence for the two-dimensional hybridization in Na0.79CoO2 and Na0.84CoO2”, Journal of Solid State Chemistry, Vol. 177 pp.1137-1145 (2004).
(4) H.Nakatsugwa, H.M.Jeong, R.H.Kim and N.Gomi, “Thermoelectric and Magnetic Properties of [(Ca1-xPbx)2CoO3.1]0.62CoO2 (0≦x≦0.03)”, Japanese Journal of Applied Physics, Vol. 46 No. 5A pp.3004-3012 (2007).
(5) H.Nakatsugawa, K.Nagasawa, Y.Okamoto, S.Yamaguchi, S.Fukuda and H.Kitagawa. “The Effects of Polysilastyrene and Au Additions on the Thermoelectric Properties in β-SiC/Si Composites”, Journal of Electronic Materials, in press (2009).

Thermoelectric oxides have been attracting increasing attention from the viewpoint of application to thermoelectric power generation using waste heat, because the candidate oxides are composed of environmentally benign elements and are chemically stable at a high temperature in air atmosphere. [Ca2CoO3]0.62CoO2, known as Ca3Co4O9, have attracted much attention as candidate for p-type thermoelectric materials. The crystallographic structure was analyzed with x-ray and neutron diffraction measurements and the neutron diffraction which was carried out at room temperature using HERMES installed on T1-3 port of JRR-3M reactor in JAERI. The lattice parameters were refined using Rietveld analysis by PREMOS in the REMOS95 package. The magnetic susceptibilities were measured using a SQUID magnetometer (quantum design MPMS) as function of temperature on both field and zerofield cooling.