Exploring the Corundum Structure as a Host for Colored Compounds - Synthesis, Structures, and Optical Studies of (MM)(3)TeO6 (M = Mg, Mn, Co, Ni, Zn; M = Mg, Mn, Co, Ni, Cu)

Bhim, Anupam and Gopalakrishnan, Jagannatha and Natarajan, Srinivasan (2018) Exploring the Corundum Structure as a Host for Colored Compounds - Synthesis, Structures, and Optical Studies of (MM)(3)TeO6 (M = Mg, Mn, Co, Ni, Zn; M = Mg, Mn, Co, Ni, Cu). In: EUROPEAN JOURNAL OF INORGANIC CHEMISTRY (20-21,). pp. 2277-2284.

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Abstract

We describe the syntheses, crystal structures, and optical absorption studies of the transition-metal-substituted corundum-related oxides (MM)(3)TeO6 (M = Mg, Mn, Co, Ni, Zn; M = Mg, Mn, Co, Ni, Cu). The oxides are readily synthesized by the solid-state reactions of stoichiometric mixtures of the constituent binaries at 750-860 degrees C. The Rietveld refinements of the crystal structures from the powder X-ray diffraction (XRD) data show that the Mg/Mn/Ni/Co/ZnO6 octahedra are distorted. We have interpreted the unique colors and the optical absorption spectra of these materials in terms of the distorted coordination geometries of the Mg/Mn/Ni/Co/ZnO6 chromophores. We have also identified the role that metal-to-metal charge transfer (MMCT) from the partially filled transition-metal 3d orbitals to the empty Mo 4d orbitals plays in the color changes. We believe that the study of these transition-metal substituted corundum oxides suggests directions for the development of colored inorganic materials featuring distorted octahedra around the 3d transition-metal ions, as they may be useful as pigments.

Item Type:	Journal Article
Publication:	EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
Publisher:	WILEY-V C H VERLAG GMBH, POSTFACH 101161, 69451 WEINHEIM, GERMANY
Additional Information:	Copyright of this article belong to WILEY-V C H VERLAG GMBH, POSTFACH 101161, 69451 WEINHEIM, GERMANY
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	20 Aug 2018 14:48
Last Modified:	20 Aug 2018 14:48
URI:	http://eprints.iisc.ac.in/id/eprint/60454

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