DataVXACS Materials LettersPaper
journal article·2024-12-02

Topochemical Synthesis and Formation Mechanism of Garnet Multimetal Fluorides

Keshav Kumar, Prabhat Thapliyal, Divya Bhutani, Rinya Rubu, Shubham Kumar Debadatta, Sheetal Kumar Jain, Premkumar Senguttuvan

ACS Materials Letters· Volume 6· Issue 12
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Source abstract

Abstract

The synthesis of multimetal fluorides (MMFs) is challenged by the usage of toxic fluoride precursors and their thermodynamic instability at higher temperatures. Here, we demonstrate a new topochemical reaction pathway to tailor garnet-type single- and multimetal fluorides from double perovskite (DP) hosts. Our combined X-ray diffraction, Fourier-transformed infrared, and nuclear magnetic spectroscopic techniques reveal the transformation pathway as DP-(NH 4 ) 3 (M/M′) 3+ F 6 to DP-(NH 4 ) 2 (Na/Li)(M/M′) 3+ F 6 to garnet-Na 3 Li 3 (M/M′) 2 F 12 ((M/M′) 3+ = Al 3+, Fe 3+, Cr 3+ and V 3+ ) through ion-exchange reaction between NH 4 + and Li + /Na + ions. The garnet MMF-Na 3 Li 3 (Fe 0.33 Cr 0.33 V 0.33 ) 2 F 12 catalyst displays ultralow overpotential (η 500 of 245 mV) with higher durability.
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Research context

Electronic materialsCatalysis & surfaces

OpenAlex topics: Luminescence Properties of Advanced Materials · Crystal Structures and Properties · Glass properties and applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

New Chemistry Unit, International Centre for Materials Science, and School of Advanced Materials, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bangalore 560064, Karnataka, India

Chemistry and Physics of Materials Unit, and School of Advanced Materials, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bangalore 560064, Karnataka, India

Solid-State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560012, Karnataka, India

Funding

Jawaharlal Nehru Centre for Advanced Scientific Research

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