| Budget Amount *help |
¥16,640,000 (Direct Cost: ¥12,800,000、Indirect Cost: ¥3,840,000)
Fiscal Year 2017: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Fiscal Year 2016: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2015: ¥12,480,000 (Direct Cost: ¥9,600,000、Indirect Cost: ¥2,880,000)
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| Outline of Final Research Achievements |
Highly coordinated iron, cobalt, nickel and copper nitrides were successfully synthesized via direct chemical reaction between a transition metal and molecular nitrogen at the pressures above approximately 30 GPa. The high pressure in-situ X-ray diffraction and Raman scattering measurements revealed that the synthesized novel transition metal nitrides were found to crystallize into the NiAs-type, marcasite-type or CdI2-type structures, in which NiAs-type FeN and marcasite-type CoN2 could be quenched at ambient pressure while marcasite-type NiN2 and CdI2-type CuN2 were found to be unstable at ambient pressure. A first-principles electronic band calculation suggests that the NiAs-type FeN and marcasite-type CoN2 exhibit metallic characteristics. The present results indicate that the crystal structures are based on the hexagonal closed packing arrangement of nitrogen atoms and the transition metal atoms occupy the highly coordinated octahedral sites.
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