Zobrazeno 1 - 10
of 27
pro vyhledávání: '"Venturini, A."'
Publikováno v:
Journal of Materials Research. 14:4482-4488
We report the stability of TlBa{sub 2}CaCu{sub 2}O{sub 7} (Tl-1212) and Tl{sub 2}Ba{sub 2}CaCu{sub 2}O{sub 8} (T1-2212) thin films and by inference, the stability of TlBa{sub 2}Ca{sub 2}Cu{sub 3}O{sub 9} (Tl-1223) and Tl{sub 2}Ba{sub 2}Ca{sub 2}Cu{su
Publikováno v:
IEEE Transactions on Appiled Superconductivity. 9:2292-2295
Elongated, discontinuous defects provide strong vortex pinning and a corresponding large increase in critical current density in highly anisotropic Tl/sub 2/Ba/sub 2/CaCu/sub 2/O/sub x/ (Tl-2212) thin films. We generate controlled, amorphous damage r
Publikováno v:
IEEE Transactions on Appiled Superconductivity. 9:1555-1558
Tl-2212 and Tl-1212 are the two easiest unsubstituted Tl-Ba-Ca-Cu-O superconducting thin films to grow. Both phases exhibit T/sub c//spl ges/95 K, J/sub c/(5 K)>10 MA/cm/sup 2/ and smooth morphologies. We report on the properties of both materials fo
Publikováno v:
IEEE Transactions on Appiled Superconductivity. 7:1592-1595
Furnace anneals of TlBa/sub 2/CaCu/sub 2/O/sub x/ thin films at temperatures above 500/spl deg/C cause partial TlO/sub x/ loss. High resolution transmission electron microscopy images reveal nanometer-scale discontinuities (pinched stacking faults) i
Publikováno v:
IEEE Transactions on Appiled Superconductivity. 7:1887-1890
Microstructural changes in TlBa/sub 2/CaCu/sub 2/O/sub 7-/spl part// (Tl-1212) epitaxial thin films resulting from low oxygen partial pressure furnace anneals at 600/spl deg/C are studied using high resolution transmission electron microscopy (TEM).
Autor:
R. G. Dunn, Eugene L. Venturini, S.S. Sokolowski, R. R. Padilla, Donald L. Overmyer, F. Dominguez, Michael P. Siegal, P.P. Newcomer
Publikováno v:
IEEE Transactions on Appiled Superconductivity. 7:1881-1886
The importance of near-equilibrium thermodynamics in the growth of TlBaCaCuO materials is well-documented; i.e. the independent control of sample temperature, Tl-oxide partial pressure, and oxygen partial pressure. Here we demonstrate how this is acc
Autor:
J.C. Barbour, P.P. Newcomer, E.L. Venturini, Bruno Morosin, Lumin Wang, Rodney C. Ewing, Mark L. Miller, James F. Kwak
Publikováno v:
Physica C: Superconductivity. 267:243-253
Ion irradiation damage creation and recovery were examined in Tl-based high temperature superconductors, HTSC, using TEM, resistivity, and magnetic measurements for irradiation temperatures of 20 to 650 K. During 1.5 MeV Kr + and Xe + ion irradiation
Autor:
R. G. Dunn, Eugene L. Venturini, F. Dominguez, Michael P. Siegal, P.P. Newcomer, Nancy A. Missert
Publikováno v:
IEEE Transactions on Appiled Superconductivity. 5:1343-1346
TlBa/sub 2/CaCu/sub 2/O/sub 7/ superconducting films 5000-6000 /spl Aring/ thick have been grown on LaAlO/sub 3/(100) substrates using oxide precursors in a two-zone thallination furnace. Smooth, nearly phase-pure 1212 films are reported, with transi
Publikováno v:
IEEE Transactions on Appiled Superconductivity. 5:2025-2028
Evidence shows that texturing is necessary to achieve high current densities and strong links in the Tl-based superconductors. Conventional sintering is not sufficient to achieve strong links, but instead, melt processing is required to produce plate
Publikováno v:
Physica C: Superconductivity. 175:241-249
We have shown that crystals in the TlCaBaCuO system are robust to anneals (oxygen, vacuum or 10%H 2 /90%N 2 ) to 500°C. Improvements in the superconducting properties, as determined from Meissner data, are observed for anneals above 300