 The study proposes a spatial confined growth strategy to encapsulate small size metal organic frameworks, MOFs, derivatives into hollow carbon nanocages, which significantly affects the dielectric polarization due to phase hybridization with tunable coherent interfaces and heterojunctions owing to size dependent oxidation motion. The study demonstrates that the effect of phase hybridization on dielectric polarization is dominant dissipation mechanism in determining microwave absorption and provides a versatile methodology for manipulating the size of MOFs derivatives and optimizing dielectric polarization and microwave attenuation in theory. This article was authored by Han Chaosu, Guizheng Zhang, Yi Wang, and others.