𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Vacuum ultraviolet, photoemission and theoretical studies of the electronic structure of Al2O3 up to 1000°C

✍ Scribed by R.H. French; R.L. Coble; R.V. Kasowski; F.S. Ohuchi

Publisher
Elsevier Science
Year
1988
Weight
227 KB
Volume
150
Category
Article
ISSN
0378-4363

No coin nor oath required. For personal study only.

✦ Synopsis

The high temperature properties of AI203 are important to the processing of this material, for understanding its conductivity and mass transport behavior for sintering, and to the high temperature applications of the material as an optical and structural material. We report the results of a study of the electronic structure of single crystal a-AIzO 3 using results of vacuum ultraviolet and X-ray photoelectron spectroscopies, and pseudofunction band structure calculations of the room-and high-temperature electronic structure, incorporating the lattice expansion and electron-phonon interaction. The optical direct band gap is found to decrease linearly from 8.8 eV at room temperature to 7.2 eV at 1763 K with a temperature coefficient of -1.1 mew K. The effect of thermal expansion and the electron-phonon interaction, on the band gap, is found to be linear in this temperature range. The valence-band width is constant with temperature, while the unoccupied conduction band states broaden and shift toward the valence band.

📜 SIMILAR VOLUMES

Theoretical studies on the structure and
Theoretical studies on the structure and electronic spectra of some isomeric fullerene derivatives C60On (n=2, 3)
✍ Jikang Feng; Aimin Ren; Weiquan Tian; Maofa Ge; Zhiru Li; Chiachung Sun; Xuehe Z 📂 Article 📅 2000 🏛 John Wiley and Sons 🌐 English ⚖ 465 KB 👁 2 views

Possible isomers of Buckminsterfullerene derivatives C O and C O 60 2 60 3 are studied with the semiempirical quantum mechanical INDO method. The C O 60 2 isomer of C symmetry, where the epoxy oxygen atoms are on the 6᎐6 bond of a s hexagon, is found most stable. The C O isomer of C symmetry with a

HeI photoelectron spectroscopic (PES) st
HeI photoelectron spectroscopic (PES) studies of the electronic structure of Al(CH3)3, In(C2H5)3 and Cd(CH3)2 compounds
✍ Dianxun Wang; Sheng Li; Ying Li; Shijun Zheng; Benming Chen; Chuanfan Ding; Yiqi 📂 Article 📅 1996 🏛 Elsevier Science 🌐 English ⚖ 251 KB

HeI photoelectron spectra (PES) of AI(CH3) 3, In(C2Hs) 3 and Cd(CH3) 2 compounds are recorded. The assignment of the PES bands is made on the basis of bandshape and ab initio SCF MO calculations using the 3-21G basis sets. Both PES experiment and theoretical calculation show that the characters of t

Electronically excited oxygen atoms, O(2
Electronically excited oxygen atoms, O(21D2). A time-resolved study of the collisional quenching by the gases H2, D2, CH4, NO, NO2, N2O, and C3O2 using atomic absorption spectroscopy in the vacuum ultraviolet
✍ R. F. Heidner III; D. Husain 📂 Article 📅 1973 🏛 John Wiley and Sons 🌐 English ⚖ 597 KB

Time-resolved atomic absorption spectroscopy in the vacuum ultraviolet has been employed to monitor electronically excited oxygen atoms, 0(2\*D2), following their generation by the flash photolysis of ozone in the Hartley band region. We report the first values for the absolute second-order rate con