The role of glass crystallization processes in preparation of high Li-conductive NASICON-type ceramics
| Autor: | Lada V. Yashina, Mikhail V. Avdeev, Oleksandr I. Ivankov, Victor A. Vizgalov, Tina Nestler, Anastasia Vyalikh, Viktor I. Petrenko, Ivan A. Bobrikov, Daniil M. Itkis |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Neutron diffraction Oxide 02 engineering and technology General Chemistry Neutron scattering 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 0104 chemical sciences law.invention chemistry.chemical_compound Chemical engineering chemistry law visual_art Fast ion conductor visual_art.visual_art_medium Ionic conductivity General Materials Science Ceramic Crystallization 0210 nano-technology Yttria-stabilized zirconia |
| Zdroj: | CrystEngComm. 21:3106-3115 |
| ISSN: | 1466-8033 |
| DOI: | 10.1039/c9ce00386j |
| Popis: | One of the approaches to tackle the problem of limited electrolyte electrochemical stability, which controls the development of novel electrochemical storage devices, is the use of solid electrolytes. Here, we focus on one of the most promising among oxide-based glass-ceramic materials, Li1+xAlxGe2−xP3O12, to investigate the physical and chemical mechanisms that govern the enhancement of Li-conductivity upon variation of its composition and glass crystallization conditions during a two-step heat treatment. Using X-ray and neutron diffraction, small-angle neutron scattering and Raman spectroscopy we found that the addition of 6–18 mol% yttria makes the polyphosphate chains in glass more thermally stable. This leads to sudden and uniform glass crystallization over the whole volume. This peculiar glass structure governs the further crystallization behavior and ensures the optimal organization of intergrain boundaries. The highest Li-conductivity is achieved for a sample with 12 mol% yttria annealed for 2 hours at 750 °C. In addition, nuclear magnetic resonance together with bond valence sum analysis provides further insight into atomistic mechanisms of ionic conductivity in NASICON-based lithium-conductive ceramics. |
| Databáze: | OpenAIRE |
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