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Lithium tantalate solid solution, Li 3+5x Ta 1−x O 4  was prepared by conventional solid-state reaction at 925 °C for 48 h. The XRD analysis confirmed that these materials crystallized in a monoclinic symmetry, space group C2/C and Z = 8, which was similar to the reported International Crystal Database (ICDD), No. 98-006-7675. The host structure, β-Li 3 TaO 4  had a rock-salt structure with a cationic order of Li + :Ta 5+  = 3:1 over the octahedral sites. A rather narrow subsolidus solution range, i.e. Li 3+5x Ta 1−x O 4  (0 ⩽ x ⩽ 0.059) was determined and the formation mechanism was proposed as a replacement of Ta 5+  by excessive Li + , i.e. Ta 5+  ↔ 5Li + . Both Scherrer and Williamson-Hall (W-H) methods indicated the average crystallite sizes in the range of 31 nm to 51 nm. Two secondary phases, Li 4 TaO 4:5  and LiTaO 3  were observed at x = 0.070 and x = −0:013, respectively. These materials were moderate lithium ionic conductors with the highest conductivity of ~2.5 × 10 −3  Ω  −1  ˙ cm− 1  at x = 0, at 0 °C and 850 °C; the activation energies were found in the range of 0.63 eV to 0.68 eV.

Subsolidus solution and ionic conductivity of rock-salt structured Li3+5xTa1−xO4 electroceramics

Subsolidus solution and ionic conductivity of rock-salt structured Li_3+5xTa_1−xO₄ electroceramics