| Budget Amount *help |
¥15,860,000 (Direct Cost: ¥12,200,000、Indirect Cost: ¥3,660,000)
Fiscal Year 2013: ¥7,020,000 (Direct Cost: ¥5,400,000、Indirect Cost: ¥1,620,000)
Fiscal Year 2012: ¥6,240,000 (Direct Cost: ¥4,800,000、Indirect Cost: ¥1,440,000)
Fiscal Year 2011: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
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| Outline of Final Research Achievements |
The mechanism of the Ca2SiO4-Ca3(PO4)2 solid solutions with respect to the dephosphorization reaction in the steal making process was studied. Thanks to the high temperature X-ray studies, the relationship between nagelschmidtite and silico-carnotite was realized and this leads to remove the inconvenience in the reported phase diagram. The single crystal structural analysis of both minerals can provide the reliable structural images and the structural information allows us to discuss the mechanism of dephosphorization, which is closely associated with the vacant Ca sites together with the random distribution of SiO4 and PO4. This research project succeeded to characterize the unique Ca-silico-phospahte in angrite. The SAED patterns of Ca silico-phosphates in D’Orbigny are consistent with those of the apatite structure. The further single crystal structural analysis of Ca-phosphate in NWA4590 demonstrates the common structural features of Ca silico-phosphates in angrites.
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