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In article number 1904746, Steven P. Hepplestone and co‐workers investigate the fundamental mechanism behind colossal permittivity exhibited in oxides. This unusual property is attributed to the formation of a thin metallic layer that forms between two insulating oxides, which becomes strongly polarized when under electric fields.
Colossal permittivity materials exhibit extreme polarization in an applied electric field, providing applications in electronics and energy transmission. Understanding the atomic‐scale mechanism behind colossal permittivity remains a challenging task and is key to optimizing materials with this property. The fundamental mechanism of colossal permittivity is reported and, using CaCu3Ti4O12 as an example,...
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