Talk:Bismuth strontium calcium copper oxide

Can anyone help out here? We need some more stuff.

Does BSCCO adopt a perovskite structure ? Rod57 (talk) 23:53, 8 June 2008 (UTC)

Is the diagram of 1 or 2 unit cells ? Rod57 (talk) 23:53, 8 June 2008 (UTC)

What annual production volumes (in Amp-metres ?) Rod57 (talk) 20:33, 11 June 2008 (UTC)

Equation

What is the value of "d" in the equation? —Preceding unsigned comment added by QuackOfaThousandSuns (talk • contribs) 01:01, 27 January 2010 (UTC)

Much less than 1 (close to zero; it accounts for oxygen non-stoichiometry). Materialscientist (talk) 01:09, 27 January 2010 (UTC)

(I changed it, it's usually x, sometimes delta.) x is controlled by the crystal growth conditions. At "optimal" doping (highest Tc), x is generally thought to be around 0.08 per copper atom in the empirical formula, although in general there is no good way to directly measure x. Tc depends on x. x can go quite a bit higher (not sure how high it can be pushed). Gruntler (talk) 02:03, 28 January 2010 (UTC)

I'm dubious whether wires are made in tubes, I thought the crystals were aligned on tape as this ensured the conducting layer was in the same or close to plane.

Anyone have anymore insight or sources? —Preceding unsigned comment added by Joshsiret (talk • contribs) 21:15, 12 August 2010 (UTC) The critical current (480A/cm2) can not be that low, even a copper conductor can withstand 600A/cm2, it has to be 93000 A/cm2 (T=4.2K). http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=919692 Moreover, the value is temperature dependent and can not be given in general. —Preceding unsigned comment added by 82.113.106.91 (talk) 01:57, 4 February 2010 (UTC)

I have corrected the numbers per previous reference. Jc indeed varies strongly with temperature, but the temperature is specified. Further comments? Materialscientist (talk) 02:11, 4 February 2010 (UTC)

That measurement was in a B-field on silver-sheathed filaments. Here's a report [1] of 2*10^6 A/cm^2 in single crystal. The text notes that Jc is highly dependent on the details of the growth process. Not sure what is best to include. Gruntler (talk) 16:23, 6 February 2010 (UTC)

Zero-field as I recall. Crystals are usually the standard material in other areas, but I'm not sure here too, because Jc is a practical parameter, and crystals are not used in applications. Perhaps this is unimportant: because of the strong dependence on several parameters, some value (for well specified conditions) will do. Materialscientist (talk) 01:03, 7 February 2010 (UTC)

Unit cell

This figure of Bi2212 unit cell is right? The lowest layer, BiO, differs from the highest layer. So What happen if it is translated in c axis direction?

Critical current density

a critical current density (maximal amperes per square metre of cross-sectional area) in the Bi-2223 filaments of 5×105 Amps/cm2 -- Should this be Amps/m2 rather than cm2? Danwoodard (talk) 17:43, 14 February 2013 (UTC)