| Budget Amount *help |
¥18,590,000 (Direct Cost: ¥14,300,000、Indirect Cost: ¥4,290,000)
Fiscal Year 2012: ¥5,850,000 (Direct Cost: ¥4,500,000、Indirect Cost: ¥1,350,000)
Fiscal Year 2011: ¥6,630,000 (Direct Cost: ¥5,100,000、Indirect Cost: ¥1,530,000)
Fiscal Year 2010: ¥6,110,000 (Direct Cost: ¥4,700,000、Indirect Cost: ¥1,410,000)
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| Research Abstract |
Physics of magnetostructural correlations in compounds with antiperovskite structure Mn3AX (A=transitional metals; X=light elements such as N) have been investigated, in order to develop various kinds of smart materials. Giant magnetostriction up to 1000 ppm was discovered in tetragonally distorted antiperovskite Mn3SbN. A broad maximum in the temperature-resistivity curve was also discovered in Mn3AgN, despite its overall metallic character. Thermal expansion adjustable metal or plastic matrix composites were fabricated using antiperovskite manganese nitrides exhibiting giant negative thermal expansion. Thermal expansion of the obtained composites is widely tunable, even negative. The physical background of the giant negative thermal expansion in the manganese antiperovskites was also explored in terms of the relation to the magnetic structure and the local structure anomaly.
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