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      Permanent link:
      https://www.ias.ac.in/article/fulltext/boms/034/06/1257-1262

    • Keywords

       

      Blue/green inorganic material; barium phosphate/manganate(V); tetrahedral manganate(V); blue/green chromophore; ligand field tuning of colour.

    • Abstract

       

      We describe a blue/green inorganic material, Ba3(P1−𝑥Mn𝑥O4)2 (I) based on tetrahedral MnO$^{3-}_{4}$ :3𝑑2 chromophore. The solid solutions (I) which are sky-blue and turquoise-blue for 𝑥 ≤ 0.25 and dark green for 𝑥 ≥ 0.50, are readily synthesized in air from commonly available starting materials, stabilizing the MnO$^{3-}_{4}$ chromophore in an isostructural phosphate host. We suggest that the covalency/ionicity of P–O/Mn–O bonds in the solid solutions tunes the crystal field strength around Mn(V) such that a blue colour results for materials with small values of 𝑥. The material could serve as a nontoxic blue/green inorganic pigment.

    • Author Affiliations

       

      Sourav Laha1 Rohit Sharma1 S V Bhat2 M L P Reddy3 J Gopalakrishnan1 S Natarajan1

      1. Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560 012, India
      2. Department of Physics, Indian Institute of Science, Bangalore 560 012, India
      3. Chemical Science and Technology Division, National Institute for Interdisciplinary Science and Technology (NIIST), Thiruvananthapuram 695 019, India
    • Dates

       

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