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High pressure in-situ synchrotron X-ray diffraction experiments wereperformed on Ag2Te up to 42.6 GPa at room temperature and four phases wereidentified. Phase I ({\beta}-Ag2Te) transformed into phase II at 2.4 GPa, andphase III and phase IV emerged at 2.8 GPa and 12.8 GPa respectively. Combinedwith first-principles calculations, we solved the phase II and phase IIIcrystal structures, and determined the compressional behavior of phase III.Electronic band structure calculations show that the insulating phase I with anarrow band gap first transforms into semi metallic phase II with theperseverance of topologically non trivial nature, and then to bulk metallicphase III. Density of States (DOS) calculations indicate the contrastingtransport behavior for Ag2-{\delta}Te and Ag2+{\delta}Te under compression. Ourresults highlight pressure's dramatic role in tuning Ag2Te's electronic bandstructure, and its novel electrical and magneto transport behaviors.

Pressure induced structural transitions and metallization in Ag2Te