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High-Temperature Proton Conduction in LaSbO₄.

Piotr Winiarz¹, Kacper Dzierzgowski¹, Aleksandra Mielewczyk-Gryń¹

¹Department of Solid State Physics, Faculty of Applied Physics and Mathematics, Gdańsk University of Technology, Narutowicza 11/12, 80233, Gdańsk, Poland.

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|January 25, 2021

Summary

Lanthanum orthoantimonate exhibits protonic conductivity, a novel finding for this material class. Doping with calcium showed potential for improving this property, though conductivity remains modest.

Keywords:

ceramics electrical conductivity fast-ion conductors proton conducting ceramics solid-state reactions

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Area of Science:

Solid-state chemistry
Materials science
Protonic conductivity

Background:

Lanthanum orthoantimonate is a material with potential applications in electrochemical devices.
Investigating protonic conductivity in novel oxide materials is crucial for developing advanced energy technologies.

Purpose of the Study:

To synthesize lanthanum orthoantimonate using a solid-state method.
To investigate the potential for enhanced protonic conductivity through calcium doping.
To characterize the structural and electrical properties of the synthesized materials.

Main Methods:

Solid-state synthesis for lanthanum orthoantimonate and Ca-doped variants.
X-ray diffraction for structural analysis.
Dilatometry for thermal expansion studies.
Electrical conductivity measurements in varying humidity and H/D isotope exchange experiments.

Main Results:

Single-phase lanthanum orthoantimonate and Ca-doped samples were successfully synthesized, crystallizing in the P2₁/n space group.
Non-linear thermal expansion was observed, with a linear thermal expansion coefficient of 9.56×10^-6 K^-1.
Protonic conductivity was confirmed under oxidizing conditions, with conductivity peaking at ~10^-6 S cm^-1 at 800°C.

Conclusions:

This study reports for the first time protonic conductivity in lanthanum orthoantimonates.
Calcium doping shows potential for optimizing protonic conductivity, although further improvements via microstructure and doping are needed.
Lanthanum orthoantimonate is a promising candidate for proton-conducting materials, warranting further research.