Bismuth Pyromangenate: Hydrothermal and Solid State Synthesis, Characterization and Optical Properties

Bi۲Mn۲O۷ nano-powders were synthesized via a stoichiometric ۱:۱ Bi:Mn molar ratio hydrothermal method at ۱۸۰ °C for ۴۸ h in a ۱M NaOH aqueous solution; and solid state method, using Bi(NO۳)۳.۵H۲O and MnO۲ as raw materials. The synthesized materials were characterized by powder X-ray diffraction (PXRD) technique. Also, the rietveld analysis was done in FullProf in profile matching mode. It was found that Bi۲Mn۲O۷ crystallizes in a cubic crystal structure with space groupFd۳ ̄m. The size and morphologies of the synthesized materials were studied by transmission electron microscopy (TEM) and field emission scanning electron microscopy (FESEM) techniques, respectively. The FESEM images showed that the synthesized Bi۲Mn۲O۷ has rod like structure in hydrothermal method and a mixture of rod and particle structures in solid state method. Also, BET-BJH analysis investigated for determination of pore size, pore volume, average particle size, pore width and surface area of the obtained materials. Also, photoluminescence spectra of the obtained materials were studied.

Keywords:

Bi۲Mn۲O۷ , Hydrothermal method , Solid state , nano materials , PXRD