• Érenburg, S. B.
• Bausk, N. V.
• Pchelyakov, O. P.
• Gritsenko, V. A.
• Gritsenko, D. V.
• Petrenko, I. P.
• Kim, C. W.
• Shaposhnikov, A. V.
• Smirnova, T. P.
• Badalyan, A. M.
• Shubin, Yu V.

Abstract

The atomic structure of amorphous and crystalline zirconium dioxide (ZrO₂) films is studied using X-ray diffraction and extended X-ray absorption fine structure techniques. The electron structure of ZrO₂ is experimentally determined using X-ray and UV photoelectron spectroscopy, and the electron energy band structure is theoretically calculated using electron density functional method. According to these data, the valence band of ZrO ₂ consists of three subbands separated by an ionic gap. The upper subband is formed by the O2p states and Zr4d states; the medium subband is formed by the O2s states; and the narrow lower subband is formed predominantly by the Zr4p states. The bandgap width in amorphous ZrO₂, as determined using the electron energy loss spectroscopy data, amounts to 4.7 eV. The electron band structure calculations performed for a cubic ZrO₂ phase point to the existence of both light (0.3m ₀) and heavy (3.5m ₀) holes, where m ₀ is the free electron mass. The effective masses of band electrons in ZrO₂ fall within (0.6-2.0)m ₀. © Pleiades Publishing, Inc., 2006.

Topics

• density
• impedance spectroscopy
• amorphous
• phase
• x-ray diffraction
• zirconium
• band structure
• photoelectron spectroscopy
• electron energy loss spectroscopy
• zirconium dioxide