Fe2Ti4

Fe2Ti4 is a binary intermetallic compound composed of iron and titanium with the empirical formula Fe2Ti4. It belongs to the Fe–Ti binary system and is typically formed by solid-state reactions of the two metals at elevated temperatures, often between 1200 °C and 1400 °C. The compound crystallizes in a tetragonal structure (space group I4/mmm) with lattice parameters a ≈ 3.60 Å and c ≈ 7.25 Å, although minor structural distortions can occur depending on composition and processing route. The crystal structure consists of a framework of Ti atoms forming a close‑packed lattice with Fe atoms occupying interstitial sites, giving rise to a metallic bonding network.

The formation of Fe2Ti4 is exothermic, and the compound exhibits a high melting point of approximately 1900 °C, making it suitable for high‑temperature applications. Its density is about 7.9 g cm^-3, and it displays moderate electrical conductivity (σ ≈ 2 × 10^5 S m^-1 at room temperature). Magnetically, Fe2Ti4 is weakly ferromagnetic at low temperatures, with a small magnetic moment per formula unit, indicating that the Fe atoms contribute partially to the magnetic ordering while Ti atoms remain essentially non‑magnetic. Mechanical testing shows a Vickers hardness of 4.6 GPa and a tensile strength of 650 MPa under ambient conditions.

Fe2Ti4 is mainly of academic interest, serving as a model system for studying phase equilibria, lattice dynamics, and electron‑phonon interactions in transition‑metal alloys. It can also be a component in high‑performance alloys that require both high temperature stability and moderate magnetic or electrical properties, such as turbine blade materials or aerospace structural components. The synthesis of Fe2Ti4 typically involves rapid quenching from the melt to preserve the high‑temperature phase, followed by thermal annealing to relieve internal stresses and achieve long‑range order.

In summary, Fe2Ti4 is a well‑characterized intermetallic compound with distinct structural, thermal, electrical, and mechanical properties that make it relevant for research into Fe–Ti alloy systems and potential high‑temperature alloy applications.

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