Featured Research

from universities, journals, and other organizations

New Form Of Nitrogen: A Semiconductor

Date:
May 10, 2001
Source:
National Science Foundation
Summary:
Scientists at the Carnegie Institution of Washington reported today they have created a new form of nitrogen by subjecting ordinary nitrogen gas, which makes up about 75 percent of the earth's atmosphere, to pressures of up to 2.4 million times the atmospheric pressure at sea level. At these pressures the nitrogen is transformed to an opaque, semiconducting solid.

Scientists at the Carnegie Institution of Washington reported today they have created a new form of nitrogen by subjecting ordinary nitrogen gas, which makes up about 75 percent of the earth's atmosphere, to pressures of up to 2.4 million times the atmospheric pressure at sea level. At these pressures the nitrogen is transformed to an opaque, semiconducting solid. The scientists also reported that, once created, the semiconducting solid can remain stable even when the pressure returns to normal.

The team, which is partially supported by the National Science Foundation (NSF) Division of Materials Research, publishes the results in the May 10 issue of Nature.

"The fact that the major portion of the air has been turned into a semiconducting solid and brought back to be stable at ambient pressure is an important breakthrough for us," said team leader Russell Hemley. Hemley and colleagues Mikhail Eremets, Ho-kwang Mao and Eugene Gregoryanz performed the research at Carnegie's Geophysical Laboratory, a core institution of the NSF's Science and Technology Center for High-Pressure Research.

This is the first time that scientists have been able to make electrical measurements on a condensed gas under such extreme high-pressure conditions.

The new, dense form of nitrogen stores a large amount of energy and could potentially serve as a new semiconducting material. Such a high-density material formed from light elements could account for part of the cores of large gas planets such as those in our own solar system.

For years, theorists have predicted that molecular nitrogen (N2 ) would become either a semiconductor or a metal if subjected to pressures on the order of a million atmospheres (100 gigapascals). A similar theory holds for gaseous hydrogen, which is expected to turn into solid metallic hydrogen under similarly high pressures. Solid metallic hydrogen has yet to be produced in the laboratory.

Previous experiments have been limited in the amount of pressure that could be applied to nitrogen, and in the number of measurements that could be performed on the material while under pressure. Last year, the Carnegie scientists reported signs of the material's transformation at room temperature, using optical techniques alone.

In their recent experiment, the investigators used newly developed techniques that allowed them to measure electrical conductivity at very high pressures and various temperatures. They found that the non-molecular semiconducting form of nitrogen was stable over a remarkably wide pressure range, and some samples - when held at low temperature - even retained this state when decompressed to atmospheric pressure.

The observations of the new from of nitrogen suggest that other novel high-density materials--perhaps even solid metallic hydrogen--could be created at high pressure and recovered at ambient pressure conditions. Equally important, this work confirms theories that have been used to predict new properties such as high-temperature superconductivity in metallic hydrogen.

NSF is an independent federal agency which supports fundamental research and education across all fields of science and engineering, with an annual budget of about $4.5 billion. NSF funds reach all 50 states, through grants to about 1,800 universities and institutions nationwide. Each year, NSF receives about 30,000 competitive requests for funding, and makes about 10,000 new funding awards.


Story Source:

The above story is based on materials provided by National Science Foundation. Note: Materials may be edited for content and length.


Cite This Page:

National Science Foundation. "New Form Of Nitrogen: A Semiconductor." ScienceDaily. ScienceDaily, 10 May 2001. <www.sciencedaily.com/releases/2001/05/010510072220.htm>.
National Science Foundation. (2001, May 10). New Form Of Nitrogen: A Semiconductor. ScienceDaily. Retrieved July 29, 2014 from www.sciencedaily.com/releases/2001/05/010510072220.htm
National Science Foundation. "New Form Of Nitrogen: A Semiconductor." ScienceDaily. www.sciencedaily.com/releases/2001/05/010510072220.htm (accessed July 29, 2014).

Share This




More Matter & Energy News

Tuesday, July 29, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Baluchistan Mining Eyes an Uncertain Future

Baluchistan Mining Eyes an Uncertain Future

AFP (July 29, 2014) Coal mining is one of the major industries in Baluchistan but a lack of infrastructure and frequent accidents mean that the area has yet to hit its potential. Duration: 01:58 Video provided by AFP
Powered by NewsLook.com
Easier Nuclear Construction Promises Fall Short

Easier Nuclear Construction Promises Fall Short

AP (July 29, 2014) The U.S. nuclear industry started building its first new plants using prefabricated Lego-like blocks meant to save time and prevent the cost overruns that crippled the sector decades ago. So far, it's not working. (July 29) Video provided by AP
Powered by NewsLook.com
Lithium Battery 'Holy Grail' Could Provide 4 Times The Power

Lithium Battery 'Holy Grail' Could Provide 4 Times The Power

Newsy (July 28, 2014) Stanford University published its findings for a "pure" lithium ion battery that could have our everyday devices and electric cars running longer. Video provided by Newsy
Powered by NewsLook.com
The Carbon Trap: US Exports Global Warming

The Carbon Trap: US Exports Global Warming

AP (July 28, 2014) AP Investigation: As the Obama administration weans the country off dirty fuels, energy companies are ramping-up overseas coal exports at a heavy price. (July 28) Video provided by AP
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins