Transparent Aluminum Is "New State of Matter"

Professor_Quail writes with this interesting excerpt: "Oxford scientists have created a transparent form of aluminum by bombarding the metal with the world's most powerful soft X-ray laser. 'Transparent aluminum' previously only existed in science fiction, featuring in the movie Star Trek IV, but the real material is an exotic new state of matter with implications for planetary science and nuclear fusion."

Comments

"Tansparent"

[4D6963]

If I got TFA right, it's only transparent to ultraviolets, through a tiny hole, and for a few femtoseconds. I'm sure it's great news but it's a bit over my head, and it's definitely nothing as cool as I was picturing.

Re:"Tansparent"

[furby076]

Typically, in research, the first hurdle is to get a repeatable and reliable test case that has almost no practical use (ala this situation). Once they accomplish that hurdle (also sometimes referred to as proof of concept) they can proceed to make it last longer (e.g. make it permenant), make it work better (e.g. invisible to the visible spectrum), make it cheaper for mass production (e.g. so we can build large versions of these) and then continue other improvements.

Basically this was a HUGE hurdle - they were able to show this is possible. Now they will get more funding and they can continue...hopefully we will see (or in this case not see) invisible alumnimum in the future and eventually other items.

BTW - similar systems (recent article) was the Green diode laser. Now with green diode lasers we will eventually have TVs using lasers to draw our images.

Temporary

[drunken_boxer777]

Not to diminish their accomplishments, but from TFA:

This turned the aluminium nearly invisible to extreme ultraviolet radiation.
Whilst the invisible effect lasted for only an extremely brief period - an estimated 40 femtoseconds - it demonstrates that such an exotic state of matter can be created using very high power X-ray sources.

So this doesn't quite have as broad a nerd appeal as the summary would lead us to believe.

Al2O3 is transparent

[OrangeTide]

Sapphire glass has been common place for many decades. It is by weight a little more than half Aluminum and very transparent.

this is proof

[prgrmr]

That the slashdot editors do not RTFA either.

Re:This is a great breakthrough...

[mcgrew]

I saw this at New Scientist yesterday and almost submitted it, until I actually read the article. The bombardment that makes it transparent only lasts for fractions of a nanosecond before the foil is comlpetely destroyed. A few commenters there pointed to some wikipedia articles with other transparent metals. One commenter said

I always thought the "transparent aluminum" of Startrek was a tongue-in-cheek thing - on the basis that it has existed both naturally and man-made for donkeys years. Ok, it is aluminium OXIDE (sapphire) instead of JUST aluminium - but it is transparent, incredibly strong, extremely hard and is made out of nowt more exotic than aluminium and oxygen.

Ruby the same of course but with a few chromium atoms bunged in for good measure and a nice red tint.

Then there's Aluminium oxynitride which comes far closer to the Star Trek windows:

Aluminium oxynitride (AlON) is a transparent ceramic composed of aluminium, oxygen and nitrogen. It is marketed under the name ALON and described in U.S. Patent 4,520,116. The material remains solid up to 1,200 C (2,190 F), and is harder than glass. When formed and polished as a window, the material currently (2005) costs about US$10 to US$15 per square inch (~ US$20,000/m).

It is currently the crucial outer layer of experimental transparent armor being considered by the US Air Force for the windows of armored vehicles. Other applications include semiconductors and retail fixtures.

Transparent ceramics:

Most ceramic materials, such as alumina and its compounds, are formed from fine powders, yielding a fine grained polycrystalline microstructure which is filled with scattering centers comparable to the wavelength of visible light. Thus, they are generally opaque materials, as opposed to transparent materials. Recent nanoscale technology has, however, made possible the production of polycrystalline transparent ceramics such as transparent alumina.

The value of the work described in TFA isn't that they made transparent aluminum, but

for an instant, Wark and his team can create a new state of matter that is as dense as ordinary solid matter, but extremely hot. "That is the sort of matter you would get towards the centre of a giant planet," says Wark.

The team hopes to study the properties of this hot, dense matter using new, more powerful lasers such as the Linac Coherent Light Source at Stanford, California. These lasers produce higher-energy X-rays that could probe the structure of the new material and measure its properties - perhaps providing some insight into the heart of Jupiter and the other giant planets.

How many times now?

[mseeger]

Hi,

please tell me: How many time has transparent aluminium been discovered by now?
I think about five to six times... E.g. in 2005

Please don't wake me up the next time someone discovers it :-).

CU, Martin

Why I do remember crap like this?

[Allicorn]

Dupe!

"Transparent Aluminum a Reality!"
http://science.slashdot.org/article.pl?sid=05/10/18/0337213

From Tuesday October 18 2005.