Formation of honeycomb ordered monoclinic Li2M 2TeO6 (M = Cu, Ni) and disordered orthorhombic Li 2Ni2TeO6 oxides

Vinod Kumar, Akanksha Gupta, S. Uma

Research output: Contribution to journalArticlepeer-review

37 Scopus citations

Abstract

Ion-exchange reactions of Na2Cu2TeO6 with excess of lithium nitrate at low temperature (300 °C) readily resulted in an isostructural honeycomb ordered monoclinic layered structure Li 2Cu2TeO6, otherwise inaccessible by direct solid state high temperature reactions. Similarly, Li2Ni 2TeO6(i) stabilized approximately in equal amounts in both of the known P2-type polymorphs (P63/mcm and P6322) was synthesized as an ion-exchange reaction product from Na2Ni 2TeO6 using a melt of lithium nitrate. Additionally, a unique tellurium containing oxide Li2Ni2TeO 6(ii) without the honeycomb ordering of Ni2+/Te 6+ ions has been obtained for the first time by the direct high temperature (800-900 °C) synthesis. The oxides were investigated by refinement of powder X-ray diffraction patterns, room temperature magnetization experiments along with Raman spectroscopy and photoluminescence measurements. A structural model has been suggested for the metastable Li2Ni 2TeO6(ii) and the presence of structural disorder was evidenced in the broadening of the Raman bands and the intense broad photoluminescence (PL) spectra obtained for Li2Ni2TeO 6(ii).

Original languageEnglish
Pages (from-to)14992-14998
Number of pages7
JournalDalton Transactions
Volume42
Issue number42
DOIs
StatePublished - 14 Nov 2013
Externally publishedYes

Fingerprint

Dive into the research topics of 'Formation of honeycomb ordered monoclinic Li2M 2TeO6 (M = Cu, Ni) and disordered orthorhombic Li 2Ni2TeO6 oxides'. Together they form a unique fingerprint.

Cite this