Stabilization of cubic Sr2FeMoO6 through topochemical reduction

Area of Science:

• Materials Science
• Solid State Chemistry
• Magnetism

Background:

• Strontium iron molybdate (Sr2FeMoO6) is a promising material for spintronic devices.
• Its high-temperature cubic phase is desirable for device performance.
• Stabilizing this phase at room temperature is a key challenge.

Purpose of the Study:

• To stabilize the high-temperature cubic phase of Sr2FeMoO6 at room temperature.
• To investigate the effect of oxygen de-intercalation on the material's structure and magnetic properties.
• To confirm the preservation of magnetic ordering after structural modification.

Main Methods:

• Topochemical de-intercalation of oxygen anions using metal hydride reduction.
• Synchrotron X-ray powder diffraction for structural analysis.
• Neutron powder diffraction for structural and stoichiometric characterization.

Main Results:

• Successful stabilization of the cubic phase of Sr2FeMoO6 at room temperature.
• The reduction process leaves the magnetic ordering of the material intact.
• Detailed structural and stoichiometric characterization of the reduced oxide was achieved.

Conclusions:

• Metal hydride reduction is an effective method to stabilize the cubic phase of Sr2FeMoO6 at room temperature.
• The method preserves the intrinsic magnetic properties of the material.
• This work paves the way for practical applications of Sr2FeMoO6 in spintronics.