Synthesis of Li3Cu2SbO6, a New Partially Ordered Rock Salt Structure

“…Different metal ion substitutions at the M site led to further ordered superstructures such as Li 3 M 2 XO 6 (M = Mg, Co, Ni, Cu; X = Nb, Ta, Bi, Sb) and Na 3 M 2 XO 6 (M = Mg Co, Ni, Cu, Zn; X = Sb). [3][4][5][6][7][8][9][10][11] The superstructures crystallizing mostly in space groups P3 1 12, C2/m or C2/c arise from the additional ordering of the two M and one X ions, to form an ordered honeycomb array separated by interleaving Li + or Na + ions (figure 1). This particular arrangement of ions belong to the structure type named as O3 corresponding to the octahedral * For correspondence coordination (O) and the number of layers (3) found in the unit cell.…”

Section: Introductionmentioning

confidence: 99%

“…Akanksha Gupta et al Among the rocksalt-based oxides, the Fe 3+ containing metal oxides are specifically investigated to study the arrangement of Fe 3+ (electronic configuration of d 5 in high spin) ions in the triangular network and also as possible cathode materials for lithium ion batteries. For example, Li 4 FeSbO 6 containing magnetic (LiFeSbO 6 ) 3− honeycomb arrays separated by non-magnetic Li + ions show antiferromagnetic order at T N ≈ 3.6 K. 16 During the investigation of the Na 2 O-Fe 2 O 3 -Sb 2 O 5 phase diagram, the corresponding sodium-containing Na 4 FeSbO 6 21 has also been found to adopt a superstructure of the α-NaFeO 2 type based on the ordering of the (NaFeSbO 6 ) 3− honeycomb slabs. Recently, Schmidt et al 22 reported Na 3 LiFeSbO 6 oxide with a similar rocksalt superstructure and showed that both Na 4 FeSbO 6 and Na 3 LiFeSbO 6 oxides exhibit Curie-Weiss behaviour consistent with the presence of high spin Fe 3+ , but without any long range magnetic ordering.…”

mentioning

confidence: 99%

Interesting cationic (Li+/Fe3+/Te6+) variations in new rocksalt ordered structures

2015

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A new series of layered oxides, Li 3 (Li 1.5x Fe 3−(x+1.5x) Te x)O 6 ,(0. 1≤ x ≤ 1.0) possessing rocksalt superstructures crystallizing in monoclinic (S.G. C2/m) symmetry is reported here. Investigations based on single crystal and powder X-ray diffraction studies for the x = 1 member, Li 3 (Li 1.5 Fe 0.5 Te)O 6 ,(a = 5.1834(1); b = 8.8858(2); c = 5.16840(8) Å; β = 110.660(1) •) confirmed the stabilization of (Li 1.5 Fe 0.5 Te 1.0 O 6) 3− honeycomb arrays with a very high amount of lithium ions. The structure for the x = 0.5 member (Li 3.75 Fe 1.75 Te 0.5 O 6) has also been confirmed by the powder X-ray diffraction Rietveld refinements. Li 3 (Li 1.5 Fe 0.5 Te)O 6 and Li 3 (Li 0.75 Fe 1.75 Te 0.5)O 6 oxides exhibited Curie-Weiss behaviour in the temperature range of 50-300 K with negative θ values. Their respective ionic conductivities were found to be 6.76 × 10 −5 Scm −1 and 2.21 × 10 −6 Scm −1 at 573 K. The UV-visible diffuse reflectance measurements for the different members of the series Li 3 (Li 1.5x Fe 3−(x+1.5x) Te x)O 6 ,(0.1≤ x ≤ 1.0) show the expected shifts in their absorption edges based on the increasing amount of Fe 3+ ions starting from x = 1.0 member to x = 0.1 member.

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“…35 The crystal structure of LMS included four types of octahedrons, where Sb 5+ ions completely occupied a group of octahedral sites and Li/Mg distributed non-randomly over other three groups of octahedral sites. 36 Here, it was more reasonable for Mn 4+ (r ¼ 0.53Å) to substitute the Sb 5+ (r ¼ 0.6Å) than Li + (r ¼ 0.76Å) and Mg 2+ (r ¼ 0.72Å) ions because of the closer radius. 37 Fig.…”

Section: Resultsmentioning

confidence: 89%