Ionic conductivity and crystal structure for the Li3−2xCr2−xTax(PO4)3 system

Preparation, characterization and conductivity studies of Li3−2x Al2−x Sb x (PO4)3

“…for LASP(x). This indicates that the Li 3 Al 2 (PO 4 ) 3 based system does not have a change in conductivity associated with the structural phase transition as reported for Li 3 Cr 2 (PO 4 ) 3 , Li 3 In 2 (PO 4 ) 3 and Li 3 Sc 2 (PO 4 ) 3 (Nagganovsky and Sigaryov 1992;Aono et al 2004). It is observed from the figure that the conductivity increases with increase in temperature.…”

“…for Li 1⋅4 Al 1⋅2 Sb 0⋅8 (PO 4 ) 3 and Li 1⋅8 Al 1⋅4 Sb 0⋅6 (PO 4 ) 3 ), though majority of observed d-lines correspond to hexagonal NASICON phase, d-lines belonging to monoclinic NASICON phase are noticed. For instance, the two d-lines in the range 2θ ≈ 13-17° corresponding to 020 and 111 planes, respectively belong to monoclinic NASICON phase (Aono et al 2004). These two compositions cannot be regarded as pure monoclinic phase due to the following observations: (i) observation of intense peaks at 2θ ≈ 21, 22, 25, 31 and 34° which are …”

“…However, the electrical properties have not been reported for many of these materials. It is observed that a high lithium ion conductivity of above 10 -4 S cm -1 was shown by the solid solutions, Li 1+x Ti 2-x M(III) x (PO 4 ) 3 (M = Al, Sc, In, etc) and the phase transition does not influence the conductivity of Li 3 M 2 (PO 4 ) 3 (M = Cr, Sc, In) based systems (Subramanian et al 1986;Lin et al 1988;Aono et al 1990Aono et al , 2004Nagganovsky and Sigaryov 1992). Recently, for Li 3-2x Cr 2-x Ta x (PO 4 ) 3 system, the maximum conductivity of 8⋅4 × 10 -6 S cm -1 at 298 K for x = 0⋅8 was obtained and it has been enhanced by about three to five times by the addition of lithium salts like Li 2 O or Li 3 PO 4 or Li 3 BO 3 (Aono et al 2004).…”

“…It is observed that a high lithium ion conductivity of above 10 -4 S cm -1 was shown by the solid solutions, Li 1+x Ti 2-x M(III) x (PO 4 ) 3 (M = Al, Sc, In, etc) and the phase transition does not influence the conductivity of Li 3 M 2 (PO 4 ) 3 (M = Cr, Sc, In) based systems (Subramanian et al 1986;Lin et al 1988;Aono et al 1990Aono et al , 2004Nagganovsky and Sigaryov 1992). Recently, for Li 3-2x Cr 2-x Ta x (PO 4 ) 3 system, the maximum conductivity of 8⋅4 × 10 -6 S cm -1 at 298 K for x = 0⋅8 was obtained and it has been enhanced by about three to five times by the addition of lithium salts like Li 2 O or Li 3 PO 4 or Li 3 BO 3 (Aono et al 2004). In continuation of our work on NASICON related materials, specially Li and Sb containing compositions (Rambabu et al 2006), we report here the preparation, characterization *Author for correspondence (muga_vithal@osmania.ac.in) and conductivity studies of NASICON type solid solution of composition, Li 3-2x Al 2-x Sb x (PO 4 ) 3 (x = 0⋅6-1⋅4) (hereafter abbreviated as LASP(x)).…”

Preparation, characterization, and impedance studies of LiSbM(PO4)3 (M=Al, Fe, and Cr)

“…[15][16][17][18][19][20][21] It is observed that the low conductivity of LiM 2 ͑PO 4 ͒ 3 can be improved by ͑a͒ increasing the lithium content and simultaneously replacing tetravalent M with trivalent MЈ ions such as Al 3+ , Fe 3+ , and Cr ͑Refs. 35 The maximum conductivity of 8.4ϫ 10 −6 S cm −1 at 298 K is obtained for Li 1.4 Cr 1.2 Ta 0.8 ͑PO 4 ͒ 3 , and the conductivity of LiCrTa͑PO 4 ͒ 3 is enhanced about three to five times by the addition of the lithium salt due to the improvement of the sinterability. 18,[26][27][28][29][30] For example, the system Li 1+x Ti 2−x Al x ͑PO 4 ͒ 3 exhibits a high conductivity ͑7 ϫ 10 −4 S cm −1 at 25°C͒ and a low activation energy ͑E a = 0.2-0.3 eV͒ for x = 0.3.…”