Thermal conductivity of argon at high pressures and temperatures

Jun 05, 2012

Diamond anvil cells (DACs) are used routinely in laboratories to apply extreme pressure to materials, recreating conditions that normally only occur deep in planetary interiors or during certain industrial manufacturing techniques. Under these conditions, however, it is difficult to measure how materials conduct heat.

To better understand , researchers from the United States and Sweden placed a thin film of iridium sandwiched between layers of argon in a DAC, subjected it to extreme pressure (50 gigapascals) and then used microsecond laser bursts to heat it to 2,500 degrees K. The researchers measured the temperature history of the iridium foil and used that data to calculate the thermal conductivity of the argon.

Their results confirmed that one model, kinetic theory, better matched observations than another model, Green-Kubo formalism. These results are important for ongoing studies of how minerals behave in the Earth's mantle and core.

Explore further: IHEP in China has ambitions for Higgs factory

More information: "Thermal conductivity of argon at high pressures and high temperatures" Journal of Applied Physics

add to favorites email to friend print save as pdf

Related Stories

Baked Slug: New Method to Test Fireproofing Material

Oct 02, 2008

In a high-temperature blaze, how well does a fireproofing material shield a building’s important steel structures from heat? Answering this question has been surprisingly difficult, but it is important information ...

Recommended for you

IHEP in China has ambitions for Higgs factory

13 hours ago

Who will lay claim to having the world's largest particle smasher?. Could China become the collider capital of the world? Questions tease answers, following a news story in Nature on Tuesday. Proposals for ...

The physics of lead guitar playing

14 hours ago

String bends, tapping, vibrato and whammy bars are all techniques that add to the distinctiveness of a lead guitarist's sound, whether it's Clapton, Hendrix, or BB King.

The birth of topological spintronics

15 hours ago

The discovery of a new material combination that could lead to a more efficient approach to computer memory and logic will be described in the journal Nature on July 24, 2014. The research, led by Penn S ...

The electric slide dance of DNA knots

19 hours ago

DNA has the nasty habit of getting tangled and forming knots. Scientists study these knots to understand their function and learn how to disentangle them (e.g. useful for gene sequencing techniques). Cristian ...

User comments : 0