Fig. 6From: Synthesis and Characterization of Nanoscale Tungsten Particles with Hollow Superstructure Using Spray Drying Combined with Calcination ProcessCharacterization of W powders. a Microstructure of W particles prepared by one-step calcination. b Microstructure of W particles prepared by two-step calcination. c TEM image of W particles with particle size distribution by two-step calcination and d HRTEM image of W particles with SAED pattern inset by two-step calcinationBack to article page