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Microstructural activation of a topochemical reduction reaction

DOI: 10.1021/acsorginorgau.1c00030 DOI Help

Authors: Zhilin Liang (University of Oxford) , Midori Amano Patino (University of Oxford) , Mylène Hendrickx (EMAT, University of Antwerp) , Joke Hadermann (EMAT, University of Antwerp) , Michael A. Hayward (University of Oxford)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Acs Organic & Inorganic Au

State: Published (Approved)
Published: November 2021
Diamond Proposal Number(s): 25166

Open Access Open Access

Abstract: The progress of the topochemical reduction reaction that converts LaSrNiRuO6 into LaSrNiRuO4 depends on the synthesis conditions used to prepare the oxidized phase. Samples of LaSrNiRuO6 that have been quenched from high temperature can be readily and rapidly converted into LaSrNiRuO4. In contrast, samples that have been slow-cooled cannot be completely reduced. This reactivity difference is attributed to the differing microstructures of the quenched and slow-cooled samples, with the former having much smaller average crystalline domain sizes and larger lattice strains than the latter. A mechanism to explain this effect is presented, in which the greater “plasticity” of small crystalline domains helps lower the activation energy of the reduction reaction. In addition, we propose that the enhanced lattice strain in quenched samples also acts to destabilize the host phase, further enhancing reactivity. These observations suggest that the microstructure of a material can be used to “activate” topochemical reactions in the solid state, expanding the scope of phases that can be prepared by this type of reaction.

Journal Keywords: Topochemical reduction; Transition-metal oxides; Solid-state microstructure; Solid-state synthesis; Phase transitions

Subject Areas: Chemistry

Instruments: I11-High Resolution Powder Diffraction

Added On: 16/11/2021 21:03


Discipline Tags:

Chemistry Inorganic Chemistry

Technical Tags:

Diffraction X-ray Powder Diffraction