J Gopalakrishnan
Articles written in Bulletin of Materials Science
Volume 23 Issue 3 June 2000 pp 169-173
Litty Sebastian A K Shukla J Gopalakrishnan
Perovskite oxides of the general formula, La0.9Sr0.1Ga0.8M0.2O3-δ for M = Mn, Co, Ni, Cu and Zn, have been prepared and investigated. All the oxides exhibit high electrical conductivities (σ R∼ 10−2 S/cm at 800°C) comparable to that of the best perovskite oxide ion conductor, La0.9Sr0.1Ga0.8Mg0.2O2.85 (LSGM) (σ ∼ 8 × 10−2 S/cm at 800°C). While M = Mn, Co, Ni, Cu members appear to be mixed conductors with a variable electronic contribution to the conductivity, especially at high oxygen partial pressures (
Volume 34 Issue 6 October 2011 pp 1257-1262
Ba3(P1−𝑥Mn𝑥O4)2 : Blue/green inorganic materials based on tetrahedral Mn(V)
Sourav Laha Rohit Sharma S V Bhat M L P Reddy J Gopalakrishnan S Natarajan
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.
Volume 46, 2023
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Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
Chemical Sciences 2020
Prof. Surajit Dhara — School of Physics, University of Hyderabad, Hyderabad
Physical Sciences 2020
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