Engineering Papers⌕ Search

SEARCH · Engineering Papers

Results for “Tl2O”

Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.

Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.

3 records
All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on Tl2O by Materials Project

Tl2O is trigonal omega-like structured and crystallizes in the trigonal R-3m space group. The structure is two-dimensional and consists of six Tl2O sheets oriented in the (0, 0, 1) direction. there are two inequivalent Tl1+ sites. In the first Tl1+ site, Tl1+ is bonded in a distorted T-shaped geometry to three equivalent O2- atoms. All Tl–O bond lengths are 2.58 Å. In the second Tl1+ site, Tl1+ is bonded in a distorted T-shaped geometry to three equivalent O2- atoms. All Tl–O bond lengths are 2.58 Å. O2- is bonded to six Tl1+ atoms to form edge-sharing OTl6 octahedra.

36 MATERIALS SCIENCE↗
NASA NTRS1989

Preparation of high T(c) Tl-Ba-Ca-Cu-O thin films by pulsed laser evaporation and Tl2O3 vapor processing

Tl-Ba-Ca-Cu-O superconducting thin films with zero-resistance temperatures up to 115 K have been prepared using a Tl2O3 vapor process on Ba-Ca-Cu-O precursor thin films. The Ba-Ca-Cu-O thin films were made by laser deposition on Y-stabilized ZrO2 substrates. This technique minimizes problems caused by the toxicity of Tl2O3, and its subsequent decomposition to the volatile and toxic Tl2O upon heating. Therefore, it may have practical application in the fabrication of high T(c) Tl-Ba-Ca-Cu-O superconducting thin-film devices.

Johs, B.↗
NASA NTRS1993

Low temperature phase formation of Tl-based superconducting thin films in reduced oxygen atmosphere

Tl-Ba-Cu-Cu-O superconducting thin films were prepared by magnetron sputtering with postannealing in a reduced oxygen atmosphere. Single-phase Tl2Ba2Ca2Cu3O(x) can form on the MgO substrate at 800 C under P(O2) about 0.1 atm. However the phase formation temperature can be affected by the starting composition of the film. Tl1Ba2Ca2Cu3O(x) phase can be formed by simply lowering the Tl2O pressure. The thermal stability of Tl1Ba2Ca2Cu3O(x) phase was studied by resistivity measurements at high temperatures.

Wu, C. Y.↗