Roland Piquepaille's Technology Trends
How new technologies are modifying our way of life


lundi 19 mai 2003
 

Making silicon is an expensive process, which conventionally involves carbothermal reduction, in which the oxygen is removed from silica by a heterogeneous-homogeneous reaction sequence at approximately 1,700 °C.

Now, Japanese researchers have developed a new technique which uses electricity to remove the oxygen from silica. In this article, Nature tells us more.

A new technique for producing silicon might make this technologically vital element cheaper. It could also give engineers new ways to design silicon chips.
The process, developed by Toshiyuki Nohira and colleagues at Kyoto University in Japan, uses electricity to strip oxygen from silica, the natural oxide of silicon. The method could make large amounts of silicon from mineral silica, such as the quartz that makes up the bulk of sand.

Here is how it works.

They immerse a piece of silica -- a quartz plate, say -- in a bath of molten calcium chloride salt at 850 ºC, and pass an electric current through a metal wire touching the quartz.
Where metal touches silica, the oxygen atoms in the silica become oxide ions, which dissolve in the molten salt -- and the silica turns slowly into silicon.

The researchers also experimented with different kinds of salts, allowing them to reduce the temperature of the bath to 500 ºC.

They think their methodology can be applied to other elements -- Nature mentions zirconium. However, the article doesn't say when this process will be commercially available.

You can read their research paper, "Pinpoint and bulk electrochemical reduction of insulating silicon dioxide to silicon," in PDF format -- providing you're a subscriber to Nature.

Source: Philip Ball, Nature, May 19, 2003


12:10:14 PM  Permalink  Comments []  Trackback []


Click here to visit the Radio UserLand website. © Copyright 2004 Roland Piquepaille.
Last update: 01/11/2004; 11:46:42.

May 2003
Sun Mon Tue Wed Thu Fri Sat
        1 2 3
4 5 6 7 8 9 10
11 12 13 14 15 16 17
18 19 20 21 22 23 24
25 26 27 28 29 30 31
Apr   Jun



Search this blog for

Courtesy of PicoSearch


Personal Links



Other Links

Ars Technica
BoingBoing
Daily Rotation News
Geek.com
Gizmodo
Microdoc News
Nanodot
Slashdot
Smart Mobs
Techdirt
Technorati


People

Dave Barry
Paul Boutin
Dan Bricklin
Dan Gillmor
Mitch Kapor
Lawrence Lessig
Jenny Levine
Karlin Lillington
Jean-Luc Raymond
Ray Ozzie
John Robb
Jean-Yves Stervinou
Dolores Tam
Dylan Tweney
Jon Udell
Dave Winer
Amy Wohl


Drop me a note via Radio
Click here to send an email to the editor of this weblog.

E-mail me directly at
pique@noos.fr

Subscribe to this weblog
Subscribe to "Roland Piquepaille's Technology Trends" in Radio UserLand.

XML Version of this page
Click to see the XML version of this web page.

Technorati Profile

Listed on BlogShares