Here, a series of high-entropy (Sm 0.2 Eu 0.2 Yb 0.2 Y 0.2 RE 0.2 ) 3 Fe 5 O 12 (RE = La, Nd, Gd, Dy, Er, Tm, Lu) garnet ceramics were synthesized by the solid-phase method. Among them, samples (Sm 0.2 Eu 0.2 Yb 0.2 Y 0.2 RE 0.2 ) 3 Fe 5 O 12 (RE = Nd, Gd, Dy, Er, Tm, Lu) forms single-phase garnet structure, and only sample (Sm 0.2 Eu 0.2 Yb 0.2 Y 0.2 La 0.2 ) 3 Fe 5 O 12 did not form single-phase but some second phases appear. Meanwhile, EDS results show that the approximate equimolar ratio of lanthanides were determined. The effects of different rare-earth composition on the structure and magnetic properties of the high-entropy rare-earth garnet ceramics were systematically investigated. Moreover, the combination of different light and heavy rare-earth makes the magnetism of the high-entropy garnet ceramics interesting, which proves the possibility of controlling the magnetism of high-entropy garnet ceramics.
The lithium garnet ceramic has been considered as one of promising solid-state electrolytes for secondary lithium batteries . However, improvement of its ionic conductivity is hindered by the high porosity related to the severe volatilization of lithium components during sintering. In order to find the solution for this problem, Li 2 O additives in concentration of 2–8 wt.% were introduced into the cubic Li 6.75 La 3 Zr 1.75 Ta 0.25 O 12 (LLZTO) at the solid-state reaction processes. It is found that the Li 2 O additives lead to formation of glassy-like phases at the grain boundaries related to the liquid-phase sintering behavior, which eliminates the residual pores therein and increases the relative density from 91.5% to 97.3%. Measurement of conductivity indicates that 6 wt.% is the optimum concentration of Li 2 O which leads to an ionic conductivity of 6.4 × 10 − 4 S cm − 1 at room temperature . This value is approximately 3 times larger than that of the ceramic without the additive.
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