Realistic models of amorphous ZrO 2 are generated in a "melt-and-quench" fashion using ab initio molecular dynamics in a plane-wave pseudopotential formulation of density-functional theory. The structural properties of the resulting amorphous models are analyzed, with special attention to coordination statistics. The vibrational and dielectric properties of one of these models are then investigated from first principles using linear-response methods. The electronic dielectric constant and Born effective charges are found to be very similar to those of the crystalline phases. Encouragingly, the predicted total static dielectric constant is ∼22, comparable to that of the monoclinic phase. This work is motivated by the search for improved gate dielectric materials for sub-0.1-μm complementary metal oxide semiconductor technology, and may also have implications for HfO 2 and for silicates of ZrO 2 and HfO 2.
|Original language||English (US)|
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|State||Published - Feb 1 2005|
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics