Pressure is a fundamental thermodynamic variable that can be used to control the properties
of materials, because it reduces interatomic distances and profoundly modifies electronic …

In the search for new functional materials, quantum mechanics is an exciting starting point.
The fundamental laws that govern the behaviour of electrons have the possibility, at the …

Experimental studies of compressed matter are now routinely conducted at pressures
exceeding 1 mln atm (100 GPa) and occasionally at pressures greater than 10 mln atm (1 …

Uranus and Neptune are generally assumed to have helium only in their gaseous
atmospheres. Here, we report the possibility of helium being fixed in the upper mantles of …

Ammonia is predicted to be one of the major components in the depths of the ice giant
planets Uranus and Neptune. Their dynamics, evolution, and interior structure are …

The high pressure chemistry of transition metals and nitrogen was recently discovered to be
richer than previously thought, due to the synthesis of several transition metal pernitrides …

Solid mixtures of ammonia and water, the so-called ammonia hydrates, are thought to be
major components of solar and extra-solar icy planets. We present here a thorough …

The interior structure of the giant ice planets Uranus and Neptune, but also of newly
discovered exoplanets, is loosely constrained, because limited observational data can be …

New topochemistry in simple molecular systems can be explored at high pressure. Here we
examine the binary nitrogen/hydrogen system using Raman spectroscopy, synchrotron X …

Ammonia is the most stable compound of nitrogen and hydrogen at ambient pressure.
However, the chemical reaction of nitrogen and hydrogen is more complex and difficult to …