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A synthesis and crystal chemical study of the fast ion conductor Li(7-3x)Ga(x)La3 Zr2O12 with x = 0.08 to 0.84.

Rettenwander D, Geiger CA, Tribus M, Tropper P, Amthauer G - Inorg Chem (2014)

Bottom Line: The unit-cell parameter, a0, of the various garnets does not vary significantly as a function of Ga(3+) 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 Ga(3+) mainly occurs in a distorted 4-fold coordinated environment that probably corresponds to the general 96h crystallographic site of garnet.

View Article: PubMed Central - PubMed

Affiliation: Department of Materials Science and Physics, University of Salzburg , Hellbrunnerstrasse 34, A-5020 Salzburg, Austria.

ABSTRACT
Fast-conducting phase-pure cubic Ga-bearing Li7La3Zr2O12 was obtained using solid-state synthesis methods with 0.08 to 0.52 Ga(3+) pfu in the garnet. An upper limit of 0.72 Ga(3+) 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 (71)Ga MAS NMR spectroscopy. The unit-cell parameter, a0, of the various garnets does not vary significantly as a function of Ga(3+) 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 Ga(3+) mainly occurs in a distorted 4-fold coordinated environment that probably corresponds to the general 96h crystallographic site of garnet.

No MeSH data available.


BSE images of the variousLi7–3xGaxLa3Zr2O12 samples with xint = 0.08–0.84.Only garnet crystals are observed from xint = 0.08 to xint = 0.54. The dark regionsare holes in the surface of the sample. The orange circle shows thephase LiGaO3, and green circles show La2Zr2O7. The diameter of each total sample circle is30 μm.
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fig3: BSE images of the variousLi7–3xGaxLa3Zr2O12 samples with xint = 0.08–0.84.Only garnet crystals are observed from xint = 0.08 to xint = 0.54. The dark regionsare holes in the surface of the sample. The orange circle shows thephase LiGaO3, and green circles show La2Zr2O7. The diameter of each total sample circle is30 μm.

Mentions: BSE images of polycrystallinechips made with the EPMA are shownin Figure 3. Examination reveals only garnetand no other phases for compositions from xint = 0.08 up to xint = 0.54. Garnet crystaldiameters are ∼10 μm. La2Zr2O7 could be identified in the sample with xint = 0.64 pfu and La2Zr2O7 and LiGaO3 in the sample with xint = 0.84 pfu. The density of the various samples appearsto increase with increasing Ga3+ content.


A synthesis and crystal chemical study of the fast ion conductor Li(7-3x)Ga(x)La3 Zr2O12 with x = 0.08 to 0.84.

Rettenwander D, Geiger CA, Tribus M, Tropper P, Amthauer G - Inorg Chem (2014)

BSE images of the variousLi7–3xGaxLa3Zr2O12 samples with xint = 0.08–0.84.Only garnet crystals are observed from xint = 0.08 to xint = 0.54. The dark regionsare holes in the surface of the sample. The orange circle shows thephase LiGaO3, and green circles show La2Zr2O7. The diameter of each total sample circle is30 μm.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4061145&req=5

fig3: BSE images of the variousLi7–3xGaxLa3Zr2O12 samples with xint = 0.08–0.84.Only garnet crystals are observed from xint = 0.08 to xint = 0.54. The dark regionsare holes in the surface of the sample. The orange circle shows thephase LiGaO3, and green circles show La2Zr2O7. The diameter of each total sample circle is30 μm.
Mentions: BSE images of polycrystallinechips made with the EPMA are shownin Figure 3. Examination reveals only garnetand no other phases for compositions from xint = 0.08 up to xint = 0.54. Garnet crystaldiameters are ∼10 μm. La2Zr2O7 could be identified in the sample with xint = 0.64 pfu and La2Zr2O7 and LiGaO3 in the sample with xint = 0.84 pfu. The density of the various samples appearsto increase with increasing Ga3+ content.

Bottom Line: The unit-cell parameter, a0, of the various garnets does not vary significantly as a function of Ga(3+) 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 Ga(3+) mainly occurs in a distorted 4-fold coordinated environment that probably corresponds to the general 96h crystallographic site of garnet.

View Article: PubMed Central - PubMed

Affiliation: Department of Materials Science and Physics, University of Salzburg , Hellbrunnerstrasse 34, A-5020 Salzburg, Austria.

ABSTRACT
Fast-conducting phase-pure cubic Ga-bearing Li7La3Zr2O12 was obtained using solid-state synthesis methods with 0.08 to 0.52 Ga(3+) pfu in the garnet. An upper limit of 0.72 Ga(3+) 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 (71)Ga MAS NMR spectroscopy. The unit-cell parameter, a0, of the various garnets does not vary significantly as a function of Ga(3+) 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 Ga(3+) mainly occurs in a distorted 4-fold coordinated environment that probably corresponds to the general 96h crystallographic site of garnet.

No MeSH data available.