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Research Results

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1998
2003
Sept. 2003
  Co43Fe20Ta5.5B31.5 bulk glassy alloy exhibiting ultrahigh fracture strength of 5,185 MPa, high Young's modulus of 268 GPa, high specific strength of 6.0 ×105 Nm kg-1 and high specific Young's modulus of 31×106 Nm kg-1 was successfully synthesized. The strength, specific strength and specific Young's modulus are higher than previous values reported for any bulk crystalline or glassy alloys. The present result was published in the advanced on-line version of Nature Materials Vol. 2 (2003) on Sept. 21st, followed by press reports in Yomiuri (on Sept. 23), Nikkei (on Sept. 23), Kahoku (on Sept. 23), Asahi (on Sept. 25), NHK News (on Sept. 22, 18 O'clock), and etc.
Prof. Inoue group(Non-equilibrium materials)
Sept. 2003
  We have found that various molecules can be inserted into single walled carbon nanotubes, allowing us to control the conducting properties of carbon nanotubes through the charge transfer from the encapsulated molecules. The present result was published in the advanced on-line version of Nature Materials Vol. 2 (2003) on Sept. 7th, followed by press reports in Mainichi, Nikkei, Sankei, Nikkan-Kogyo, and etc. on Sept. 8th.
Prof. Iwasa group(Low Temperature Condensed State Physics)
June-July. 2003
  A high-performance lithium-based hydrogen storage material was developed. The material, including lithium, boron, and nitrogen, can store hydrogen more than 3 times higher-density than that in the conventional materials, and was thermodynamically modified for the applications by the elemental substitution techniques. The result was reported in the Nikkei NanoTechnology (web-version, June 3, 23, and July 22), and some newspapers of Nikkei (July 19), Asahi (July 23), and Kahokushimpo (July 23).
Prof. Togano group(High-Temperature Materials Science, Environmental Materials Science)
May. 2003
  Germanium-silicon single crystals with Si content 0.73 were successfully grown. GeSi solid solution semiconductors are expected as high-speed electronic devices, substrates, and various functional materials for photo-sensors, X-ray detectors, etc. for band gap and lattice parameter engineering. Large single crystals with Si content 0.73 of diameter and length more than 20 and 70 mm, respectively, have been successfully grown. The result was reported in the Japan Industrial Journal on March 28, and in the Kahoku Shimpo on May 5, 2003.
Prof. Suezawa group(Crystal Lattice Defect group)and LAM
Jan. 2003
  A new lead-free ferroelectric material was developed. Ferroelectric materials are widely used for capacitors and piezoelectric devices. In those applications, xxlead-freexx is an important keyword due to environmental issues. The newly developed material is a Ba-Ti-O double oxide, BaTa2O5. The compound was synthesized in single crystal by a floating zone (FZ) method. Excellent ferroelectricity was discovered in a particular direction of crystal plane. The result was reported in the Japan Industrial Journal on January 17.
Jan. 2003
  Ni-Nb-Ti-Zr system metallic glasses with strength 7 times higher than that of stainless steels and corrosion resistance 1000 times higher than that of stainless steels in hydrochloric acid were developed by using rapid solidification technique. The glassy alloys can be fabricated in a sheet form and the application as a separator material for solid polymer fuel cells can be expected. The result was reported in the newspaper of the Asahi Shimbun on January 14, 2003.
Prof. Inoue group(Non-equilibrium materials)