Nanocomposites obtained by integrating iron oxide magnetic nanoparticles (Fe 3 O 4 ) into a metal-organic framework (HKUST-1 or Cu 3 IJBTC) 2 , BTC = 1,3,5-benzenetricarboxylate) are synthesized through conversion from a composite of a Cu-based ceramic material and Fe 3 O 4 . In situ small-angle X-ray scattering (SAXS) and wide-angle X-ray scattering (WAXS) measurements reveal that the presence of