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Growth and Electrostatic/chemical Properties of Metal/LaAlO3/SrTiO3 Heterostructures

Growth and Electrostatic/chemical Properties of Metal/LaAlO₃/SrTiO₃ Heterostructures

Published on: February 8, 2018

Insight into ramsdellite LI(2)Ti(3)O(7) and its proton-exchange derivative.

Alodia Orera¹, M Teresa Azcondo, Flaviano García-Alvarado

¹Departamento de Química, Universidad San Pablo-CEU, Urbanización Montepríncipe, Boadilla del Monte, E-28668, Madrid, Spain.

Inorganic Chemistry

|July 14, 2009

Summary

The crystal structure of lithium titanate Li(2)Ti(3)O(7) was clarified using advanced techniques. Proton-exchanged H(2)Ti(3)O(7) shows enhanced proton conductivity in humid conditions due to water molecule diffusion.

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Molten-Salt Synthesis of Complex Metal Oxide Nanoparticles

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Published on: October 27, 2018

Area of Science:

Materials Science
Solid-State Chemistry
Crystallography

Background:

The crystal structure of ramsdellite-like Li(2)Ti(3)O(7), a known lithium-ion conductor for 30 years, remained uncertain with two proposed models.
The accepted model, where lithium and titanium occupy octahedral sites, was challenged by (6)Li and (7)Li MAS NMR spectroscopy, indicating ~14% empty octahedral positions.

Purpose of the Study:

To re-examine and clarify the crystal structure of proton-exchanged H(2)Ti(3)O(7), derived from Li(2)Ti(3)O(7) via nitric acid treatment.
To investigate the proton environments, acidity, and electrical conductivity of H(2)Ti(3)O(7), particularly its behavior in the presence of water.

Main Methods:

Combined X-ray diffraction (XRD) and neutron powder diffraction (NPD) for structural analysis.
Utilized (1)H and (7)Li Magic Angle Spinning Nuclear Magnetic Resonance (MAS NMR) spectroscopy for chemical and structural insights.
Investigated proton mobility and electrical conductivity in varying humidity conditions.

Main Results:

The study confirmed the presence of two types of protons in H(2)Ti(3)O(7) with differing acidity based on their oxygen coordination.
H(2)Ti(3)O(7) readily absorbs water, which significantly enhances proton mobility and electrical conductivity in humid atmospheres.
Water molecules appear to facilitate proton diffusion by entering the tunnels within the crystal structure.

Conclusions:

The re-examination provides a clearer understanding of the H(2)Ti(3)O(7) structure and its proton conduction mechanism.
The enhanced proton conductivity in wet conditions highlights the potential of H(2)Ti(3)O(7) as a proton-conducting material, especially in applications involving moisture.