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Double NASICON-type cell: ordered Nd3+ distribution in Li0.2Nd0.8/3Zr2(PO4)3
Maud Barré1, Marie-Pierre Crosnier-Lopez, Françoise Le Berre
1Laboratoire des Oxydes et Fluorures (UMR CNRS 6010), Avenue Olivier Messiaen, 72085, Le Mans cedex 09, France.
Dalton Transactions (Cambridge, England : 2003)
|June 4, 2008
Summary
This study characterizes a NASICON compound, Li(0.2)Nd(0.8/3)Zr(2)(PO(4))(3), revealing reversible Nd(3+) ion diffusion above 600°C. This behavior impacts its crystal structure and ionic conductivity, crucial for solid-state applications.
Area of Science:
- Materials Science
- Solid-State Chemistry
- Crystallography
Background:
- NASICON (Na Super Ionic Conductor) materials are known for their potential in solid electrolytes.
- Understanding the structural and ionic transport properties of novel NASICON compositions is critical for advancing battery technology.
- Lithium and Neodymium co-doped Zirconium Phosphate NASICON presents a unique system for investigation.
Purpose of the Study:
- To structurally characterize the NASICON compound Li(0.2)Nd(0.8/3)Zr(2)(PO(4))(3) synthesized via sol-gel.
- To investigate the temperature-dependent behavior of Nd(3+) ion distribution and its effect on the crystal structure.
- To evaluate the ionic conductivity and sintering properties of this NASICON material.
Main Methods:
- Sol-gel synthesis for material preparation.
- Transmission Electron Microscopy (TEM) and powder diffraction (neutron and X-ray) for structural characterization.
- Thermal X-ray diffraction to monitor structural changes with temperature.
- Impedance spectroscopy for ionic conductivity measurements.
Main Results:
- The compound crystallizes in space group R3[combining macron] (No. 148) with an ordered Nd(3+) distribution at room temperature, doubling the c parameter.
- Above 600°C, Nd(3+) diffusion occurs, leading to the loss of the supercell structure at 1000°C.
- This cationic diffusion is reversible and occurs within a stable 3D [Zr(2)(PO(4))(3)](-) network.
- Initial ionic conductivity and sintering data were obtained.
Conclusions:
- The NASICON compound Li(0.2)Nd(0.8/3)Zr(2)(PO(4))(3) exhibits temperature-dependent structural transitions due to reversible Nd(3+) ion diffusion.
- The observed reversible cationic diffusion in a stable framework is a key characteristic for potential solid electrolyte applications.
- Further research into optimizing sintering and conductivity is warranted.
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