Synthesis and characterization of new rocksalt superstructure type layered oxides Li4.5M0.5TeO6 (M(III) = Cr, Mn, Al, Ga)

S. Uma; Akanksha Gupta

doi:10.1016/j.materresbull.2015.12.011

Synthesis and characterization of new rocksalt superstructure type layered oxides Li_4.5M_0.5TeO₆ (M(III) = Cr, Mn, Al, Ga)

S. Uma, Akanksha Gupta

University of Delhi

Research output: Contribution to journal › Article › peer-review

12 Scopus citations

Abstract

Oxides of stoichiometry Li_4.5M_0.5TeO₆ (M(III) = Cr, Mn, Al, Ga) have been synthesized by the solid state method and are characterized for the first time. The Rietveld refinements of the PXRD measurements confirmed the structure to be similar to the Li₃(Li_1.5Fe_0.5Te)O₆ (S.G. C2/m; a ∼ 5.183 Å; b ∼ 8.885 Å; c ∼ 5.168 Å; β ∼ 110.6°) oxide. The oxides undergo ion-exchange reactions with Ag⁺ ions. UV-vis diffuse reflectance measurements showed the variation in the band gaps in consistent with the colors observed from brown, brick red to white respectively for Cr³⁺, Mn³⁺ and Al³⁺ or Ga³⁺ containing oxides. The stabilization of Li_4.5M_0.5TeO₆ (M(III) = Cr, Mn, Al, Ga) obtained by varying the alkali metal (Li⁺) ions together with other M³⁺ ions and Te⁶⁺ ions forming the edge shared octahedral layer in the rocksalt ordered structures yet again shows the rich compositional versatility of AMO₂ type oxides.

Original language	English
Pages (from-to)	118-123
Number of pages	6
Journal	Materials Research Bulletin
Volume	76
DOIs	https://doi.org/10.1016/j.materresbull.2015.12.011
State	Published - Apr 2016
Externally published	Yes

Bibliographical note

Publisher Copyright:
© 2015 Elsevier Ltd. All rights reserved.

Funding

This work was supported by the DST (SR/S1/PC-07/2011), DU-DST Purse Grant Phase-II, Government of India and by the University of Delhi under the ‘Scheme to Strengthen R & D Doctoral Research Program’. We thank the USIC, University of Delhi for providing SEM-EDAX facility. AG thanks DST, Government of India for fellowship.

Funders	Funder number
DU-DST
Department of Science and Technology, Ministry of Science and Technology, India	SR/S1/PC-07/2011
University of Delhi

Keywords

Ionic conductivity
Layered compounds
Oxides
X-ray diffraction

Access to Document

10.1016/j.materresbull.2015.12.011

Cite this

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abstract = "Oxides of stoichiometry Li4.5M0.5TeO6 (M(III) = Cr, Mn, Al, Ga) have been synthesized by the solid state method and are characterized for the first time. The Rietveld refinements of the PXRD measurements confirmed the structure to be similar to the Li3(Li1.5Fe0.5Te)O6 (S.G. C2/m; a ∼ 5.183 {\AA}; b ∼ 8.885 {\AA}; c ∼ 5.168 {\AA}; β ∼ 110.6°) oxide. The oxides undergo ion-exchange reactions with Ag+ ions. UV-vis diffuse reflectance measurements showed the variation in the band gaps in consistent with the colors observed from brown, brick red to white respectively for Cr3+, Mn3+ and Al3+ or Ga3+ containing oxides. The stabilization of Li4.5M0.5TeO6 (M(III) = Cr, Mn, Al, Ga) obtained by varying the alkali metal (Li+) ions together with other M3+ ions and Te6+ ions forming the edge shared octahedral layer in the rocksalt ordered structures yet again shows the rich compositional versatility of AMO2 type oxides.",

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