Dimorphism, phase transitions, and transport properties in LiZr2(PO4)3

Crystal Structure and Magnetic Properties of Li2Mn2(SO4)3

“…These tests were unfruitful because the lithium ions were trapped in two di!erent tetrahedral sites and they could not be extracted from Li Mn (SO ) . This result is in agreement with the structural arrangement of the Sc (WO ) -type compounds which are poor ionic conductors (24).…”

Structural and electrical characterization of the NASICON-type Li2FeZr(PO4)3 and Li2FeTi(PO4)3 compounds

“…5, the electrical conductivity of Li:FeZr(PO4)3 is always lower than that of Li2FeTi(PO4)3, moreover the latter compound shows resistivity values lower than those of both ~-and ~-LiZrz(PO4) 3 phase at temperatures higher than 350 ~ and in the range 150-300 ~ Below 150 ~ the ~-LiZr2(PO4)~ is the best lithium ion conductor, while [3-LiZrz(PO4) 3 is the best only in a small temperature range (305-350 ~ The high temperature phase of 13-LiZr2(PO4) 3 has the lowest activation energy (0.47 eV) among all the compounds considered here. This result does not agree with the much smaller value (0.28 eV) reported in the literature [9] (where the straightline was obtained by very few data). The value determined here is very close to that of the phase (0.47 eV); on the other hand there results confirm the microscopic Li § ion transport mechanisms suggested from neutron diffraction measurements [1,1 I].…”

“…On the other hand the I~-LiZrz(PO4) 3 compound shows a change in the slope at about 300 ~ (see Fig. 6); this behaviour is attributed to the ~ (orthorhombic) ---) 9' (monoclinic) phase transition [9]. The activation energy was evNuated to be 0.47 and 1.03 eV for the former and the latter phase, respectively.…”

Synthesis, structure, and electric properties of Li1+xScxZr2-x(PO4)3(x= 0.1, 0.2, 0.3) ceramics

“…The authors of [12,13] 573 K temperature was found to be σ = 1.2 S/m and σ = 5·10 −2 S/m respectively [11]. At room temperature the value of ionic conductivity of LiZr 2 (PO 4 ) 3 is lower than 10 −7 S/m.…”

“…At 1423-1473 K temperature sintered LiZr 2 (PO 4 ) 3 pellets belong to rhombohedral symmetry (lattice parameters a = 8.860 Å and c = 22.13 Å). According to whether synthesis is carried out at a temperature of 1473 or 1173 K, two different phases are obtained [11]. The LiZr 2 (PO 4 ) 3 compound prepared at 1473 K shows a NASICON-type structure and a monoclinic rhombohedral first order transition takes place at a temperature of about 313 K. LiZr 2 (PO 4 ) 3 prepared at lower temperature (1173 K) exhibits the β-Fe 2 (SO 4 ) 3 -type structure and a monoclinic-orthorhombic transformation takes place at 573 K temperature.…”