| Budget Amount *help |
¥27,300,000 (Direct Cost: ¥21,000,000、Indirect Cost: ¥6,300,000)
Fiscal Year 2012: ¥15,470,000 (Direct Cost: ¥11,900,000、Indirect Cost: ¥3,570,000)
Fiscal Year 2011: ¥11,830,000 (Direct Cost: ¥9,100,000、Indirect Cost: ¥2,730,000)
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| Research Abstract |
We proposed a procedure of the first principles thermodynamic calculation with considering long-range interactions. First we developed source codes for calculating the long-range interaction and applied the procedure to a point-charge model of the chalcopyrite structure. Then, we applied the procedure to order-disorder behavior on cation sites in MgAl_2O_4 spinel. We found that it is essential to consider the long-range interactions accurately in order to predict the order-disorder behavior accurately in multicomponent system with configurations of heterovalent ions. In addition, we proposed a procedure for evaluating the accuracy of the cluster expansion method based on the structure selection. Using the procedure, the accuracy of the cluster expansion method for a wide range of structures is improved.
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