Fast-conducting
phase-pure cubic Ga-bearing Li7La3Zr2O12 was obtained using solid-state
synthesis methods with 0.08 to 0.52 Ga3+ pfu in the garnet.
An upper limit of 0.72 Ga3+ pfu in garnet was obtained,
but the synthesis was accompanied by small amounts of La2Zr2O12 and LiGaO3. The synthetic
products were characterized by X-ray powder diffraction, electron
microprobe and SEM analyses, ICP-OES measurements, and 71Ga MAS NMR spectroscopy. The unit-cell parameter, a0, of the various garnets does not vary significantly
as a function of Ga3+ content, with a value of about 12.984(4)
Å. Full chemical analyses for the solid solutions were obtained
giving: Li7.08Ga0.06La2.93Zr2.02O12, Li6.50Ga0.15La2.96Zr2.05O12, Li6.48Ga0.23La2.93Zr2.04O12, Li5.93Ga0.36La2.94Zr2.01O12, Li5.38Ga0.53La2.96Zr1.99O12, Li4.82Ga0.60La2.96Zr2.00O12, and Li4.53Ga0.72La2.94Zr1.98O12. The NMR
spectra are interpreted as indicating that Ga3+ mainly
occurs in a distorted 4-fold coordinated environment that probably
corresponds to the general 96h crystallographic site
of garnet.
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