Cubic MgO micro-particles with approximately 5-10 mu m dimensions were synthesized indirectly from magnesium salt solutions through three consecutive steps, namely: wet chemical precipitation, hydrothermal and thermal dissociation. In wet chemical precipitation step Mg(OH)(2) uniform lamellar hexagonal nano-structure with about 30 nm in thickness were synthesized from 0.2 M Mg(NO3)(2) center dot 6H(2)O solution, subsequent hydrothermal processing of synthesized Mg(OH)(2) lamellar hexagonal nano-structure in 10, 20, 30, 60, 120 and 180 min produced 5-10 mu m MgCO3 micro-cubes which calcinations of these particles leads to production of the same size MgO micro-cubes. Most pure MgCO3 micro-cubes were synthesized after 120 min of hydrothermal processing. STA analysis revealed that the best temperature for calcinations is about 700 degrees C.

Keywords: MgO; Nano structure; Cubic morphology; Hydrothermal; Calcinations