Featured Research

from universities, journals, and other organizations

Quantum simulations uncover hydrogen's phase transitions

Date:
July 17, 2010
Source:
DOE/Lawrence Livermore National Laboratory
Summary:
Hydrogen is the most abundant element in the universe and is a major component of giant planets such as Jupiter and Saturn. But not much is known about what happens to this abundant element under high-pressure conditions when it transforms from one state to another.

Hydrogen is the most abundant element in the universe and is a major component of giant planets such as Jupiter and Saturn.

But not much is known about what happens to this abundant element under high-pressure conditions when it transforms from one state to another.

Using quantum simulations, scientists at the Lawrence Livermore National Laboratory, the University of Illinois at Urbana-Champaign and the University of L'Aquia in Italy were able to uncover these phase transitions in the laboratory similar to how they would occur in the centers of giant planets.

They discovered a first order phase transition, a discontinuity, in liquid hydrogen between a molecular state with low conductivity and a highly conductive atomic state. The critical point of the transition occurs at high temperatures, near 3100 degrees Fahrenheit and more than 1 million atmospheres of pressure.

"This research sheds light on the properties of this ubiquitous element and may aid in efforts to understand the formation of planets," said LLNL's Eric Schwegler.

The team used a variety of sophisticated quantum simulation approaches to examine the onset of molecular diassociation in hydrogen under high-pressure conditions. The simulations indicated there is a range of densities where the electrical conductivity of the fluid increases in a discontinuous fashion for temperatures below 3100 degrees Fahrenheit.

There is a liquid-liquid-solid multiphase coexistence point in the hydrogen phase diagram that corresponds to the intersection of the liquid-liquid phase transition, according to Miguel Morales from the University of Illinois and lead author of a paper appearing online in the Proceedings of the National Academy of Sciences for the week of June 21-25.

Other collaborators include Prof. David Ceperley from the University of Illinois at Urbana-Champaign, and Prof. Carlo Pierleoni from the University of L'Aquila. The work was funded in part by the National Nuclear Security Administration under the Stewardship Science Academic Alliances program.


Story Source:

The above story is based on materials provided by DOE/Lawrence Livermore National Laboratory. Note: Materials may be edited for content and length.


Journal Reference:

  1. M. A. Morales, C. Pierleoni, E. Schwegler, D. M. Ceperley. Evidence for a first-order liquid-liquid transition in high-pressure hydrogen from ab initio simulations. Proceedings of the National Academy of Sciences, 2010; DOI: 10.1073/pnas.1007309107

Cite This Page:

DOE/Lawrence Livermore National Laboratory. "Quantum simulations uncover hydrogen's phase transitions." ScienceDaily. ScienceDaily, 17 July 2010. <www.sciencedaily.com/releases/2010/06/100623165125.htm>.
DOE/Lawrence Livermore National Laboratory. (2010, July 17). Quantum simulations uncover hydrogen's phase transitions. ScienceDaily. Retrieved April 18, 2014 from www.sciencedaily.com/releases/2010/06/100623165125.htm
DOE/Lawrence Livermore National Laboratory. "Quantum simulations uncover hydrogen's phase transitions." ScienceDaily. www.sciencedaily.com/releases/2010/06/100623165125.htm (accessed April 18, 2014).

Share This



More Matter & Energy News

Friday, April 18, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Small Reactors Could Be Future of Nuclear Energy

Small Reactors Could Be Future of Nuclear Energy

AP (Apr. 17, 2014) After the Fukushima nuclear disaster, the industry fell under intense scrutiny. Now, small underground nuclear power plants are being considered as the possible future of the nuclear energy. (April 17) Video provided by AP
Powered by NewsLook.com
Horseless Carriage Introduced at NY Auto Show

Horseless Carriage Introduced at NY Auto Show

AP (Apr. 17, 2014) An electric car that proponents hope will replace horse-drawn carriages in New York City has also been revealed at the auto show. (Apr. 17) Video provided by AP
Powered by NewsLook.com
Honda's New ASIMO Robot, More Human-Like Than Ever

Honda's New ASIMO Robot, More Human-Like Than Ever

AFP (Apr. 17, 2014) It walks and runs, even up and down stairs. It can open a bottle and serve a drink, and politely tries to shake hands with a stranger. Meet the latest ASIMO, Honda's humanoid robot. Duration: 00:54 Video provided by AFP
Powered by NewsLook.com
German Researchers Crack Samsung's Fingerprint Scanner

German Researchers Crack Samsung's Fingerprint Scanner

Newsy (Apr. 16, 2014) German researchers have used a fake fingerprint made from glue to bypass the fingerprint security system on Samsung's new Galaxy S5 smartphone. Video provided by Newsy
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