R3: 高圧科学・地球深部

[R3-06] 高温高圧下におけるFe₅O₆とFe₄O₅の安定性

彦坂 晃太郎²、*新名 良介^1,2、廣瀬 敬^2,3、石井 貴之⁴、大石 泰生⁵ (1. 明治大、2. 東大、3. 東工大、4. BGI、5. JASRI)

キーワード：酸化鉄、ダイヤモンドアンビルセル、高圧力、Fe4O5、Fe5O6

We performed in-situ X-ray diffraction measurements in a laser-heated diamond-anvil cell to determine the phase relations in Fe₅O₆ and Fe₄O₅ bulk compositions to 61 GPa and to 2720 K. Result indicates that none of the compounds between FeO and Fe₃O₄ are formed beyond ~40 GPa at 1800 K. As some superdeep diamonds have genetic links with these high-pressure iron oxides, our results give constraints on pressure and temperature conditions of their formation.