Sắt(II,III) diphosphat

Sắt(II,III) diphosphat
Tên khác	Triron đipyrophotphat Triron điđiphotphat Sắt(II,III) điphotphat(V) Triron đipyrophotphat(V) Triron điđiphotphat(V) Sắt(II,III) pyrophotphat Triferrum đipyrophotphat triferrum điđiphotphat Triferrum đipyrophotphat(V) Triferrum điđiphotphat(V)

Nhận dạng
Số CAS	132333-22-3
Thuộc tính
Công thức phân tử	Fe₃(P₂O₇)₂
Khối lượng mol	515,4274 g/mol
Bề ngoài	tinh thể nâu đen^[1]
Khối lượng riêng	3,07 g/cm³^[1]
Điểm nóng chảy
Điểm sôi
Độ hòa tan trong nước	không tan
Cấu trúc
Hằng số mạng	a = 0,895 nm, b = 1,2235 nm, c = 1,0174 nm

Trừ khi có ghi chú khác, dữ liệu được cung cấp cho các vật liệu trong trạng thái tiêu chuẩn của chúng (ở 25 °C [77 °F], 100 kPa). Tham khảo hộp thông tin

Sắt(II,III) điphotphat hay sắt(II,III) pyrophotphat (công thức hóa học: Fe₃(P₂O₇)₂) là một trong những sắt pyrophotphat, chứa cả hai trạng thái hóa trị Fe²⁺ và Fe³⁺. Ngoài ra, sắt pyrophotphat khác bao gồm Fe₂P₂O₇, Fe₇(P₂O₇)₄, Fe₄(P₂O₇)₃ và nhiều hơn.^[2] Trong hợp chất này, tỉ lệ Fe₂P₂O₇:Fe₄(P₂O₇)₃ là 1:1.

Tính chất

Triron đipyrophotphat có hai dạng tinh thể, α- và β-. Pyrophotphat loại α có thể thúc đẩy quá trình khử axit isobutyric.^[3]

Cấu trúc

Fe₃(P₂O₇)₂ kết tinh trong nhóm không gian Pnma, ký hiệu Pearson oP84,62, các hằng số mạng tinh thể a = 0,895 nm, b = 1,2235 nm, c = 1,0174 nm, α = 90°, β = 90°, γ = 90°.^[1]

Tham khảo

^ ^a ^b ^c Handbook of inorganic substances 2017, trang 595 – [1]. Truy cập 26 tháng 3 năm 2020.
^ LK Elbouaanani, B Malaman, R Gerardin, et al. Crystal Structure Refinement and Magnetic Properties of Fe₄(P₂O₇)₃ Studied by Neutron Diffraction and Mössbauer Techniques. Journal of Solid State Chemistry, 2002. 163 (2): 412–420. doi:10.1006/jssc.2001.9415.
^ Jacques C. Védrine. Partial oxidation reactions on phosphate-based catalysts. Topics in Catalysis 11/12 (2000), 147–152.

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