Talk:Magnesium diboride

I haven't seen anything new on Magnesium diboride in years. What are the problems that have inhibited its use? pstudier 22:13, 18 June 2006 (UTC)

Recently, a cryogenic-free 0.5 Tesla open MRI system has been successfully designed and built using 18 Km of MgB2 conductors. I doubt this. Even if there was an MRI built, it would still have to be cooled. Paul Studier 04:24, 28 October 2007 (UTC) Never mind, found reference, and cryogenic free just means that they did not need liquids. Paul Studier 04:34, 28 October 2007 (UTC)

Latice parameters
Is it possible to add the lattice parameters to the info? They are a = 3.086 Å and c = 3.524 Å at room temperature as reported in: Nagamatsu, J., Nakagawa, N., Muranaka, T., Zenitani, Y., & Akimitsu, J. (2001). Superconductivity at 39 K in magnesium diboride. Nature, 410(6824), 63–4. doi:10.1038/35065039 Zyrill (talk) 08:32, 27 June 2013 (UTC)

Recent papers
There has been work on the improvement in Jc and Hc by doping MgB2 with 10% to 30% malic acid (C4H6O5).

M S A Hossain, J H Kim, X Xu, X L Wang, M Rindfleisch, M Tomic, M D Sumption, E W Collings and S X Dou. Supercond. Sci. Technol. 20 No 8 (August 2007) L51-L54 http://www.iop.org/EJ/article/0953-2048/20/8/L03/sust7_8_L03.pdf (18 refs)
 * Significant enhancement of Hc2 and Hirr in MgB2+C4H6O5 bulks at a low sintering temperature of 600 °C.

Also H Yamada, N Uchiyama, A Matsumoto, H Kitaguchi and H Kumakura. Supercond. Sci. Technol. 20 No 6 (June 2007) L30-L33 http://www.iop.org/EJ/article/0953-2048/20/6/L02/sust7_6_L02.pdf (16 refs)
 * The excellent superconducting properties of in situ powder-in-tube processed MgB2 tapes with both ethyltoluene and SiC powder added.

M Eisterer. Supercond. Sci. Technol. 20 No 12 (December 2007) R47-R73 (503 refs) http://www.iop.org/EJ/article/0953-2048/20/12/R01/sust7_12_R01.pdf
 * Magnetic properties and critical currents of MgB2.

I'll try to update the article soon Rod57 (talk) 00:17, 14 June 2008 (UTC)

Wording
Deleted:
 * In 2001 it was regarded as behaving more like a low-Tc metallic than a high-Tc cuprate superconductor.

This sentence is worded poorly. It can mean "like a metallic superconductor (metallic superconductors have low Tc)" or it can mean "like a superconductor which has a low Tc among metallic ones". I initially read it as the second, which didn't make any sense; the first seems to have been intended, so I just took the temperature references out. Ken Arromdee (talk) 15:06, 29 July 2010 (UTC)

Used for record high current : 2014
Round wires (rather than tape) developed for high current (20kA) tests at CERN. - Rod57 (talk) 12:11, 10 June 2014 (UTC)

Thermal conductivity - can we give figures ?
Can we summarise the existing source and add something like "thermal conductivity (below Tc) falls roughly proportional to absolute temperature. At 10 K it is about 1 W/metre-K (polycrystalline) or 20 W/metre-K in single crystals" ? - Rod57 (talk) 19:58, 23 August 2019 (UTC)

Physical mechanical properties
Since/if it is brittle (which makes it hard to use in power cables) can we say at what temperature it becomes brittle, and how much stress or strain it can take before fracturing ? Rod57 (talk) 02:52, 30 December 2019 (UTC)

How are discrete crystals made
Thermal conductivity has been measured in crystals. How are they made ? It can't be melted without decomposing - but is there anything that will dissolve it ? Could crystals be grown from solution ? - Rod57 (talk) 02:57, 30 December 2019 (UTC)