HfHfO3

HfO₂ (hafnium oxide) is a high-k ceramic compound belonging to the refractory oxide family, characterized by exceptional thermal stability and a wide bandgap. It is primarily used in advanced semiconductor gate dielectrics as a replacement for traditional SiO₂ in sub-28 nm CMOS technology nodes, where it enables continued device scaling while reducing gate leakage currents. The material is also explored for optical coatings, thermal barrier applications, and emerging high-temperature structural ceramics, making it notable for applications requiring both electrical performance and extreme thermal resistance.