Active research is ongoing that investigates the properties of matter under extreme pressure.
Such condensed matter is found inside planets at millions of atmospheres and thousands of …

Pressure profoundly alters all states of matter. The symbiotic development of ultrahigh-
pressure diamond anvil cells, to compress samples to sustainable multi-megabar pressures; …

Pressure‐stabilized hydrides are a new rapidly growing class of high‐temperature
superconductors, which is believed to be described within the conventional phonon …

Polymorphism and polymorphic transitions are attracting considerable interest because of
their significant effect on the phase stability, switchable properties, and the atomic …

Studies of polynitrogen phases are of great interest for fundamental science and for the
design of novel high energy density materials. Laser heating of pure nitrogen at 140 GPa in …

Water-rich regions in Earth's deeper mantle are suspected to play a key role in the global
water budget and the mobility of heat-generating elements. We show that ice-VII occurs as …

Sodium chloride (NaCl), or rocksalt, is well characterized at ambient pressure. As a result of
the large electronegativity difference between Na and Cl atoms, it has highly ionic chemical …

Following the discovery of high-temperature superconductivity in the La–H system, we
studied the formation of new chemical compounds in the barium-hydrogen system at …

In the phase diagram of water, superionic ices with highly mobile protons within the stable
oxygen sublattice have been predicted at high pressures. However, the existence of …

The pentazolates, the last all-nitrogen members of the azole series, have been notoriously
elusive for the last hundred years despite enormous efforts to make these compounds in …