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Fig. 7 | Nanoscale Research Letters

Fig. 7

From: Synthesis and Characterization of Nanoscale Tungsten Particles with Hollow Superstructure Using Spray Drying Combined with Calcination Process

Fig. 7

The XRD pattern and microstructure of products. a The XRD pattern of intermediates in one-step direct calcination at 650 °C. b The XRD pattern of intermediates in two-step calcination in second heating at 650 °C for 20 min. c The XRD pattern of final W powder in two-step calcination. d The microstructure of final W powder in two-step calcination

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