Crystal Structure and Li-Ion Conductivity of LiGa 1 − x Al x GeO 4 Phenacite Compounds with 0 ≤ x ≤ 1
2016; Institute of Physics; Volume: 163; Issue: 10 Linguagem: Inglês
10.1149/2.1111610jes
ISSN1945-7111
AutoresKazuhiko Mukai, Naoyoshi Nunotani,
Tópico(s)Semiconductor materials and interfaces
ResumoCompounds of LiGa1−xAlxGeO4 with 0 ≤ x ≤ 1 were examined using powder X-ray diffraction measurements and electrochemical impedance spectroscopy, to clarify their structures and Li-ion conductivity (σLi) as a function of x, and to compare with those for a wide variety of AB2O4-type oxides. The x = 0 and 0.25 samples were found to exhibit a phenacite structure with R space group, whereas the x ≥ 0.5 samples were found to exhibit an ordered phenacite structure with R3 space group due to the 1:1 cation order between Ga3+/Al3+ and Ge4+ ions. The σLi value for the x = 0 sample was 2.81(1) × 10−5 S⋅cm−1 at 973 K. Owing to the 1:1 cation order, both σLi and activation energy (Ea) were slightly improved at x = 1. The structural details of LiGa1−xAlxGeO4, possible conduction pathway of Li+ ions, and correlation between crystal structure and σLi (Ea) are presented.
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