scholarly journals Determination of the symmetry of the superconducting pairing state and formation of a low-temperature normal metallic state in YBCO by electron irradiation

1995 ◽  
Author(s):  
J. Giapintzakis ◽  
D.M. Ginsberg ◽  
M.A. Kirk
Keyword(s):  
Low Temperature ◽  
Electron Irradiation ◽  
Metallic State ◽  
Pairing State ◽  
Superconducting Pairing

scholarly journals Experimental determination of the superconducting pairing state in YBCO from the phase coherence of YBCO-Pb dc SQUIDs

1993 ◽  
Vol 71 (13) ◽  
pp. 2134-2137 ◽  
Author(s):  
D. A. Wollman ◽  
D. J. Van Harlingen ◽  
W. C. Lee ◽  
D. M. Ginsberg ◽  
A. J. Leggett
Keyword(s):  
Experimental Determination ◽  
Phase Coherence ◽  
Pairing State ◽  
Superconducting Pairing

The experimental determination of hydromagnesite precipitation rates at 22.5–75ºC

2014 ◽  
Vol 78 (6) ◽  
pp. 1405-1416 ◽  
Author(s):  
U.-N. Berninger ◽  
G. Jordan ◽  
J. Schott ◽  
E. H. Oelkers
Keyword(s):  
Low Temperature ◽  
Experimental Determination ◽  
Closed System ◽  
Equilibrium Constants ◽  
Magnesium Silicate ◽  
Silicate Mineral ◽  
Dissolution Rates ◽  
Dissolution And Precipitation

Natural hydromagnesite (Mg5(CO3)4(OH)2·4H2O) dissolution and precipitation experiments were performed in closed-system reactors as a function of temperature from 22.5 to 75ºC and at 8.6 < pH < 10.7. The equilibrium constants for the reaction Mg5(CO3)4(OH)2·4H2O + 6H+ = 5Mg2+ + 4HCO3– + 6H2O were determined by bracketing the final fluid compositions obtained from the dissolution and precipitation experiments. The resulting constants were found to be 1033.7±0.9, 1030.5±0.5 and 1026.5±0.5 at 22.5, 50 and 75ºC, respectively. Whereas dissolution rates were too fast to be determined from the experiments, precipitation rates were slower and quantified. The resulting BET surface areanormalized hydromagnesite precipitation rates increase by a factor of ~2 with pH decreasing from 10.7 to 8.6. Measured rates are approximately two orders of magnitude faster than corresponding forsterite dissolution rates, suggesting that the overall rates of the low-temperature carbonation of olivine are controlled by the relatively sluggish dissolution of the magnesium silicate mineral.

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