Bi 2 Ca 2− x Na Co O y materials with = 0 ≤ 0.125, have been prepared either by sintering through the classical ceramic method, or textured using laser floating zone technique. XRD results shown that phase is major one, independently of content, in both kind samples. SEM studies a drastic microstructural modification between sintered and laser-textured materials. Na-doping increases density gra...