Pressure-induced reentrant structural transition and equation of state of indium

Abstract

The structural stability of indium was investigated under high pressures up to 247 GPa using synchrotron X-ray diffraction techniques. A reentrant structural transition from a face-centered tetragonal (fct-I with c/a > 1) to a face-centered orthorhombic (fco) and further to an fct-I structure was revealed. The first transition (from fct-I to fco) and the second transition (from fco to fct-I) were observed at approximately 50 GPa and 150 GPa, respectively. The second transition was of the second order despite the first transition being of the first order. The theoretically predicted fct-II (c/a < 1) phase was not observed at pressures up to 247 GPa. The equation of state of indium is discussed compared to that of other period 5 elements.

Solid-state electronegativity of atoms: new approaches

“…Experimental data from Sugimoto et al (2014) and Akahama et al (2019Akahama et al ( , 2020. f.c.t = face-centred tetragonal.…”

“…Change of force constants and ENs of metals upon transitions to high-pressure phases.Experimental data fromSugimoto et al (2014) andAkahama et al (2019Akahama et al ( , 2020. f.c.t = face-centred tetragonal.…”

Ab initio calculations of the phase diagrams of tin and lead under pressures up to a few TPa

“…The method proved to perform well in calculations of the properties of different crystals under pressure [9,30,35,36]. In particular, the authors of reference [35] managed to theoretically confirm the existence of the face-centered orthorhombic (fco) structure of indium under pressure [37,38]. In addition to the experimentally observed structures of Sn and Pb (β, bct, bco, bcc, fcc, hcp), we here consider a number of other phases: the simple hexagonal (shex) and cubic (sc) structures, the hexagonal ω-phase, and the double hexagonal close-packed (dhcp) structure.…”