Crystal Growth of a Series of Lithium Garnets Ln3Li5Ta2O12 (Ln=La, Pr, Nd): Structural Properties, Alexandrite Effect and Unusual Ionic Conductivity

Document Type

Paper

Subject Area(s)

Chemistry

Abstract

We report the single crystal structures of a series of lanthanide containing tantalates, Ln3Li5Ta2O12 (Ln=La, Pr, Nd) that were obtained out of a reactive lithium hydroxide flux. The structures of Ln3Li5Ta2O12 were determined by single crystal X-ray diffraction, where the Li+ positions and Li+ site occupancies were fixed based on previously reported neutron diffraction data for isostructural compounds. All three oxides crystallize in the cubic space group Ia3¯d (No. 230) with lattice parameters a=12.7735(1), 12.6527(1), and 12.5967(1) Å for La3Li5Ta2O12, Pr3Li5Ta2O12, and Nd3Li5Ta2O12, respectively. A UV–Vis diffuse reflectance spectrum of Nd3Li5Ta2O12 was collected to explain its unusual Alexandrite-like optical behavior. To evaluate the transport properties of Nd3Li5Ta2O12, the impedance data were collected in air in the temperature range 300⩽T(°C)⩽500.

All three oxides crystallize in the cubic space group Ia3¯d">Ia3¯d (No. 230) with lattice parameters a=12.7735(1), 12.6527(1), and 12.5967(1) Å for La3Li5Ta2O12, Pr3Li5Ta2O12, and Nd3Li5Ta2O12, respectively. A UV–Vis diffuse reflectance spectrum of Nd3Li5Ta2O12 was collected to explain its unusual Alexandrite-like optical behavior. To evaluate the transport properties of Nd3Li5Ta2O12, the impedance data were collected in air in the temperature range 300⩽T(°C)⩽500.

Digital Object Identifier (DOI)

https://doi.org/10.1016/j.jssc.2008.10.032

Rights

© Journal of Solid State Chemistry 2008, Elsevier.

APA Citation

Roof, I., Smith, M., Cussen, E., & zur Loye, H.-C. (2008). Crystal Growth of a Series of Lithium Garnets Ln3Li5Ta2O12 (Ln=La, Pr, Nd): Structural Properties, Alexandrite Effect and Unusual Ionic Conductivity. Journal of Solid State Chemistry, 182(2), 295–300. https://doi.org/10.1016/j.jssc.2008.10.032

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