Dear Colleagues,
I prepared YBCO ( 123) heated at 920°C and formed pellet and observed very good levitation.
But, after that, I sintered the pallet at 950°C and then the Levitation reduces to a great extent.
Does this mean that the Superconducting YBCO is damaged and transition experiment is not possible?
Please discuss.
Thanks and Regards
N Das
Prof. Nityananda Das
I found the following research open-access paper, however as I said, let us wait for an experimentalist in the field of HTSC synthesis in the best case to answer:
Article Advantages of Multi-seeded (RE)-Ba-Cu-O Superconductors for ...
Best Regards.
Prof. Nityananda Das
The cc Wiki on levitation has an interesting effect that I did not know previously:
"...The direct diamagnetic levitation
I extract from cc Wiki * the following explanation:
A substance that is diamagnetic repels a magnetic field. All materials have diamagnetic properties, but the effect is very weak and is usually overcome by the object's paramagnetic or ferromagnetic properties, which act in the opposite manner.
But any material in which the diamagnetic component is stronger will be repelled by a magnet.
Direct diamagnetic levitation can be used to levitate very light pieces of pyrolytic graphite or bismuth above a moderately strong permanent magnet. As water is predominantly diamagnetic, this technique has been used to levitate water droplets.
However, the magnetic fields required for this are very high, typically in the range of 16 teslas, and therefore create significant problems if ferromagnetic materials are nearby. The operation of this electromagnet used in the frog levitation experiment required 4 MW (4000000 watts) of power
The minimum criterion for direct diamagnetic levitation is
B dB/dz= μ0 ρ g/χ
where chi χ - is the magnetic susceptibility and g the gravitation field...".
cc Wiki:
* https://en.wikipedia.org/wiki/Magnetic_levitation
Best Regards
Prof. P. Contreras,
Thanks a lot for very interesting information about levitation.
But, I face the problem, that due to sintering the levitation is being lost. Does it imply that superconductivity of the material is lost?
Regards
N Das
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