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Current issue

ELEKTRO 7/2018 was released on June 27th 2018. Its digital version will be available on July 27th 2018.

Topic: Cables, conductors and cable engineering; Tools, equipment and accessories for work with cables

Main Article
Parametrization of circuit models of Li-accumulators for electromobility
Smart Cities (part 3 – volume 1)

SVĚTLO (Light) 4/2018 was released on July 30th 2018. Its digital version will be available on August 31th 2018.

Refreshing our memory
Eccentric luminaires of René Roubíček from the years1965 till 1977
Bases of photometry – 1st part
Great personage of Czech science of times after Battle at Bílá hora: doctor, naturalist, philosopher and physicist Jan Marek Marci from Kronland

Optical radiation effects and use
The light and circadian rhythms

Lithium ‘doping’ turns graphene into a superconductor

11.09.2015 | ExtremeTech | www.extremetech.com

Scientists from Canada and Europe have published results showing that “decoration” of graphene samples with lithium can change the behavior of electrons passing through it and turn the super-material into a superconductor.

It’s a property that was first predicted by a super-computer, now confirmed through physical experiment. It’s a breakthrough that could herald a new age of graphene electronics - though it’s still got a long way to go.

Graphene made into superconductor

Graphene is often referred to as having very low electrical resistance - and it does - but the reality is that when compared with a true superconductor, a shielded wire made of graphene may as well be a block of wood. Superconductors are finicky, technical creations that depend on just one property for their definition: 100% of any electricity put into a superconducting system at one end must come out the other, unhindered by resistance of any kind.

There are still very low temperatures involved here. The “decoration” process in which the lithium atoms are attached takes place at just 8K, or -265.15 °C. Their measured transition temperature for superconducting graphene was even lower: 5.9K, or -267.25 °C.

That means that while graphene has been induced to have a truly incredible electrical property, it has not solved all our earthly technological problems. The big problem with the superconductors scientists have managed to create is that they all, like graphene, require cooling to “cryogenic” temperatures to work, meaning that we can’t create large or inexpensive quantities of superconductors for things like large-scale grid power upgrades or cheap fusion containment rigs.

Read more at ExtremeTech

Image Credit: Wikipedia

-jk-