Phase Diagram and Impedance Spectroscopy Study of the La _{0.5+ x−y} Bi _y Li _{0.5−3 x} TiO ₃ System

Abstract

has been studied. Using powder X-ray diffraction, five distinct areas have been found in the triangle Bi 0.5 Li 0.5 TiO 3 /La 2/3 -TiO 3 /La 0.5 Li 0.5 TiO 3 . A region of perovskite-like solid solutions was obtained when the bismuth content in the general formula La 0.5+x−y Bi y Li 0.5−3x TiO 3 was less than y = 0.10. Two

Synthesis and Electrical Properties of the Pr0.5+x−yBiyLi0.5−3xTiO3 System

“…Fast ionic conductors with the general formula RE 0.5+ x Li 0.5−3 x TiO 3 , where RE = La, Pr, Nd, and Sm have been reported,7−12 for which the maximum conductivity was for the La series (1.1·10 −3 S·cm −1 for x = 0.07 at room temperature) 7. More recently the phase diagram, crystal chemistry, and ionic conductivity of the system La 0.5+ x − y Bi y Li 0.5−3 x TiO 3 have been reported 13. The compounds of this system are ionic conductors whose conductivity increases as the amount of lithium increases, up to x = 0.075, but decreases when the amount of bismuth increases.…”

“…The compounds of this system are ionic conductors whose conductivity increases as the amount of lithium increases, up to x = 0.075, but decreases when the amount of bismuth increases. The system with Bi needs less time in the thirst treatment at 1250 °C than a similar system without bismuth 13…”

Crystal Structure and Electrical Properties of La<sub>0.45</sub>Ce<sub>0.1</sub>Li<sub>0.27</sub>TiO<sub>3</sub> Synthesized by Sol-Gel Technique

“…In general, this value is higher in sol-gel obtained samples than in ceramic obtained samples [15]. The activation energy is slightly higher than in grains, which is related with the fact of the grain boundary is a very defective region [11,12]. Anyway, this value is lower than reported in related systems, which suggest that the optimization of this system can result in low conductivity materials.…”

“…This fact has been related to the shortening of cell parameters found as a result of the smaller substitute cation ionic radius [9]. Many other related systems were prepared by substitutional doping for RE or Ti [10][11][12]. As a rule, none of these related solids improves the maximum conductivity value previously reported.…”

Study of the lithium insertion and de-insertion in perovskite praseodymium bismuth lithium titanate

“…[11][12][13][14] Recently, the rare-earth cations were partially substituted by bismuth. 15,16 In the system Pr 0.5+x−y Li 0.5−3x Bi y TiO 3 a pure phase solid solution exists only in the domain 0.033 < x < 0.133 and y ≤ 0.10. 16 The presence of A-site vacancies favors high mobility of lithium ions.…”