Read this CrystEngComm Hot article to discover how the Kirkendall effect can be used to make BiOI nests.
Zhi Zheng and co-workers from Central China Normal University made δ-Bi2O3 spheres, which became the reactive template to make the hierarchical ternary BiOI nest-shaped structures.
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Low temperature synthesis of δ-Bi2O3 solid spheres and their conversion to hierarchical BiOI nests via the Kirkendall effect
Manying Liu, Lizhi Zhang, Kewei Wang and Zhi Zheng
CrystEngComm, 2011, DOI: 10.1039/C1CE05101F