Structural control of ionic conductivity in LiAlSi2O6 and LiAlSi4O10 glasses and single crystals
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Anna-Maria Welsch
Abstract
In order to better understand the mechanisms of lithium dynamics and to elucidate the influence of defects in lithium mobility, we have studied the Li-ion propagation through natural single crystals of α-spodumene, LiAlSi2O6 and petalite, LiAlSi4O10 using impedance spectroscopy. Electrical conductivity in petalite and α-spodumene is 4–5 orders of magnitude lower than in glasses of the same composition, and three orders of magnitude lower than in synthetic β-spodumene. Conductivity in α-spodumene is anisotropic with conductivity along the c-axis being 0.3–0.4 log units higher than perpendicular to the c-axis. Contrary to α-spodumene, isotropic conductivity was observed for petalite single crystals. Despite the large difference in conductivity values, the activation energies for ionic conduction of α-spodumene along the c-axis (74 to 86 kJ/mol) are only slightly higher than for LiAlSi2O6 and LiAlSi4O10 glasses (∼67 kJ/mol). On the other hand, much higher activation energies of 112–134 kJ/mol were determined for petalite. Based on our investigation, a vacancy-controlled transport mechanism is indicated for the densely packed α-spodumene structure, while in the open framework structure of petalite formation and movement of Li interstitials is proposed to be dominant mechanism for charge transfer.
© by Oldenbourg Wissenschaftsverlag, Hannover, Germany
Articles in the same Issue
- Preface
- Bombardment Induced Potassium Ion Transport Through a Sodium Ion Conductor: Conductivities and Diffusion Profiles
- Diffusion and Cluster Growth of Binary Alloys on Surfaces
- Synthesis of Novel Lithium Salts containing Pentafluorophenylamido-based Anions and Investigation of their Thermal and Electrochemical Properties
- Dual-ion Cells Based on Anion Intercalation into Graphite from Ionic Liquid-Based Electrolytes
- Ionic Transport and Structure in Doped Plastically Crystalline Solids
- Transport and Electromechanical Properties of Stoichiometric Lithium Niobate at High Temperatures
- Low-Temperature DC Conductivity of LiNbO3 Single Crystals
- Self-Diffusion of Lithium in Amorphous Lithium Niobate Layers
- Theoretical Investigation of Migration Pathways for Li Diffusion in h-LiTiS2
- Kinetics of Lithium Intercalation in Titanium Disulfide Single Crystals
- Structural control of ionic conductivity in LiAlSi2O6 and LiAlSi4O10 glasses and single crystals
- Studying Li Dynamics in a Gas-Phase Synthesized Amorphous Oxide by NMR and Impedance Spectroscopy
- Li Ion Dynamics in Al-Doped Garnet-Type Li7La3Zr2O12 Crystallizing with Cubic Symmetry
Articles in the same Issue
- Preface
- Bombardment Induced Potassium Ion Transport Through a Sodium Ion Conductor: Conductivities and Diffusion Profiles
- Diffusion and Cluster Growth of Binary Alloys on Surfaces
- Synthesis of Novel Lithium Salts containing Pentafluorophenylamido-based Anions and Investigation of their Thermal and Electrochemical Properties
- Dual-ion Cells Based on Anion Intercalation into Graphite from Ionic Liquid-Based Electrolytes
- Ionic Transport and Structure in Doped Plastically Crystalline Solids
- Transport and Electromechanical Properties of Stoichiometric Lithium Niobate at High Temperatures
- Low-Temperature DC Conductivity of LiNbO3 Single Crystals
- Self-Diffusion of Lithium in Amorphous Lithium Niobate Layers
- Theoretical Investigation of Migration Pathways for Li Diffusion in h-LiTiS2
- Kinetics of Lithium Intercalation in Titanium Disulfide Single Crystals
- Structural control of ionic conductivity in LiAlSi2O6 and LiAlSi4O10 glasses and single crystals
- Studying Li Dynamics in a Gas-Phase Synthesized Amorphous Oxide by NMR and Impedance Spectroscopy
- Li Ion Dynamics in Al-Doped Garnet-Type Li7La3Zr2O12 Crystallizing with Cubic Symmetry
