Synthesis and characterization of a solid solution series of the type Bi₂M_xMn_4-xO₁₀ (M = Cr³⁺, Co³⁺ and 0.0 ≤ x ≤ 2.0.)

Abstract

Bi₂Mn₄O₁₀ was synthesized from corresponding metal salts in glycerin by using an organic precursor-based glycerin nitrate method. The precursor was heated at various temperatures (300 – 800 °C) for about 18 hours to determine the lowest synthesis temperature for the formation of Bi₂Mn₄O₁₀. The XRD patterns of the calcined samples revealed that the desired mullite type phase started to form at 600 °C, which became more crystalline with further increase of calcination temperature. Attempts were also taken to prepare chromium and cobalt incorporated solid solution series with nominal composition Bi₂M_xMn_4-xO₁₀ (M = Cr³⁺ and Co³⁺) by the same procedure. The XRD data of these series exhibited mullite type single phase up to x = 0.7 and 0.1 compositions for chromium and cobalt, respectively. For further insertion of M, an extra phase appeared along with the mullite type phase.

J. Bangladesh Acad. Sci. 45(1); 13-26: June 2021