• M S Hegde

      Articles written in Bulletin of Materials Science

    • Thermal behaviour of hydroxides, hydroxysalts and hydrotalcites

      Parthasarathi Bera Michael Rajamathi M S Hegde P Vishnu Kamath

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      Mass spectrometric analysis of gases evolved during thermal decomposition of divalent metal hydroxides, hydroxysalts and hydrotalcites show that all these compounds undergo dehydration in the temperature range 30 <T < 220°C followed by decomposition at temperatures above 250°C. The latter step involves simultaneous deanation and dehydroxylation of the layers. Our observations conclusively prove that alternative mechanisms which envisage CO2 evolution due to deanation at lower temperatures proposed by Kanezaki to be wrong.

    • Solution-combustion synthesis of Bi1–𝑥Ln𝑥O1.5 (Ln = Y and La–Yb) oxide ion conductors

      Manjunath B Bellakki A S Prakash C Shivakumara M S Hegde A K Shukla

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      Cubic fluorite related Bi1–𝑥Ln𝑥O1.5 (Ln = Y and La–Yb) phases are synthesized by solutioncombustion method using glycine as the fuel. The cubic fluorite phase is stabilized with 25 mole% of rare earth cations. The lattice parameter of cubic phase increases linearly with size of the lanthanide ion. The synthesized powders are nano-metric in size and exhibit excellent compactability and reach 98% densification even on short period of sintering. The oxides with relatively larger cations Nd, Sm, Eu, Pr and Gd with 25 mole% composition transform to rhombohedral structure while others retain cubic upon sintering. All the phases show high oxide–ion conductivity and the values obtained are in good agreement with the reported values.

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