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: New microscope collects dynamic images of the molecules that animate life

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

Cooling with molecules

Oct 22, 2014

An international team of scientists have become the first ever researchers to successfully reach temperatures below minus 272.15 degrees Celsius – only just above absolute zero – using magnetic molecules. ...

User comments : 0