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Figure 3: SE-micrograph images recorded for pure and some selected Mn-doped 212-Bi-Sr-V-O system with two different magnification factors 2000x μm & 5000x μm where (a) Bi2SrV2O9, (c) Bi2SrV1.9Mn0.1O9 and (e) Bi2SrV1.7Mn0.3O9.