منابع مشابه
First principles study of oxygen vacancy defects in tantalum pentoxide
First principles total energy calculations were performed to characterize oxygen vacancy defects in tantalum pentoxide (Ta2O5). A simplified version of the crystalline orthorhombic phase of Ta2O5 was used in this study. Results indicate that O vacancies in Ta2O5 can be broadly classified based on their location in the lattice. One type of vacancy that occupies the ‘‘in-plane’’ sites displays de...
متن کاملSpectroscopy of ytterbium-doped tantalum pentoxide rib waveguides on silicon
The design, fabrication and spectroscopic characterization of ytterbium-doped Ta2O5 rib waveguide are described. The waveguides are fabricated on silicon substrates and operate in a single mode at wavelengths above 970 nm. The peak absorption cross-section was measured to be 2.75 × 10 cm at 975 nm. The emission spectrum was found to have a broad fluorescence spanning from 990 nm to 1090 nm with...
متن کاملFirst principles study of oxygen vacancy migration in tantalum pentoxide
First principles total energy calculations were performed in order to determine oxygen vacancy migration energies in Ta2O5 . A simplified version of the crystalline orthorhombic phase of Ta2O5 was used in this study. O vacancies in the chosen model of Ta2O5 can be broadly classified into ‘cap’ and ‘in-plane’ sites based on their location in the lattice. The cap type of vacancies display the lar...
متن کاملMocvd of Tantalum Pentoxide for Large-area Ulsi Circuit Wafers
Ta2O5 films of 10-150 nm thickness were prepared by oxygen-assisted pyrolytic LPCVD at 450-490°C from tantalum penta ethoxide and 0 2 with N2 diluent. Silicon wafers 150 mm in diameter were used as substrates with a novel LPCVD reactor. The films were annealed in dry 0 2 a t 700-800°C. Compositional, structural, and electrical evaluations demonstrate that these uniform, pure, and conformal Ta2O...
متن کاملWaveguide lasers in ytterbium-doped tantalum pentoxide on silicon.
A waveguide laser in an ytterbium-doped tantalum pentoxide film is reported. The waveguide is formed of a rib of sputtered tantalum pentoxide on top of oxidized silicon with an over-cladding of silica. Emission at a wavelength of 1025 nm was achieved with an absorbed pump power threshold and slope efficiency of ≈29 mW and 27%, respectively, for a cavity formed by a high reflector mirror and an...
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ژورنال
عنوان ژورنال: The Journal of the Society of Chemical Industry, Japan
سال: 1968
ISSN: 0023-2734,2185-0860
DOI: 10.1246/nikkashi1898.71.3_346