Crystal growth of a series of lithium garnets Ln3Li5Ta2O12 (Ln=La, Pr, Nd): Structural properties, Alexandrite effect and unusual ionic conductivity
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" role="presentation" style="box-sizing: border-box; margin: 0px; padding: 0px; display: inline-block; line-height: normal; font-size: 14.4px; word-spacing: normal; overflow-wrap: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; position: relative;">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.
Published in Journal of Solid State Chemistry, Volume 182, Issue 2, 2009, pages 295-300.
© Journal of Solid State Chemistry 2009, Elsevier
Roof, I. P., Smith, M. D., Cussen, E., zur Loye, H.-C., (2009). Crystal Growth of a Series of Lithium Garnets Ln3Li5Ta2O12 (Ln = La, Pr, Nd): Structural Properties, Alexandrite Effect and Unusual Ionic Conductivity., 182, 295-300