Structural stability of the Li-ion conductor Li7La3Zr2O12 investigated by high-pressure in-situ X-ray diffraction and Raman spectroscopy
- Department of Crystalline Materials Science, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi, 464-8603 (Japan)
- Department of Materials Physics, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi, 464-8603 (Japan)
- National Institute of Advanced Industrial Science and Technology (AIST), AIST Tsukuba Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki, 305-8565 (Japan)
Highlights: • Lithium ion conductor of Garnet-related-type structure Li{sub 7}La{sub 3}Zr{sub 2}O{sub 12}. • Conversion(M.E.) • High-pressure behavior of Li{sub 7}La{sub 3}Zr{sub 2}O{sub 12} is investigated up to 70 GPa. • High pressure in-situ X-ray diffraction measurements and Raman spectroscopy. • Tetragonal Li{sub 7}La{sub 3}Zr{sub 2}O{sub 12} transforms to high-pressure cubic one under high pressure. - Abstract: The high-pressure behavior of Li{sub 7}La{sub 3}Zr{sub 2}O{sub 12} (LLZO) with a garnet-related structure has been investigated for the first time by high pressure in situ X-ray diffraction measurements and Raman spectroscopy using a diamond anvil cell. It was found that the tetragonal LLZO transforms to the high-pressure cubic phase (HP-c-LLZO) at 71.8 GPa in a N{sub 2} medium and at 25.8 GPa in the absence of pressure mediums. Uniaxial compression in the absence of pressure mediums induced the phase transition at much lower pressures than in the hydrostatic case when N{sub 2} was used as the pressure medium. High pressure in situ Raman spectroscopy suggested that the Li coordination in HP-c-LLZO was different from that reported in cubic LLZO, which had been stabilized by doping Al at ambient pressure and room temperature.
- OSTI ID:
- 22805304
- Journal Information:
- Materials Research Bulletin, Vol. 107; Other Information: Copyright (c) 2017 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0025-5408
- Country of Publication:
- United States
- Language:
- English
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