The high-pressure chemistry of potassium–copper mixtures

• Published in: Solid state communications 2004-07, Vol.131 (3), p.157-161
• Main Authors: Snider, Trent S., Badding, John V.
• Format: Article
• Language: English
• Subjects: C. X-ray scattering; Cross-disciplinary physics: materials science; rheology; D. Phase transitions; E. Strain, high pressure; E. X-ray and X-ray spectroscopies; Exact sciences and technology; Materials science; Phase diagrams and microstructures developed by solidification and solid-solid phase transformations; Phase diagrams of metals and alloys; Physics
• ISSN: 0038-1098; 1879-2766
• DOI: 10.1016/j.ssc.2004.05.017

The chemistry of various potassium-copper mixtures placed in a Mao-Bell diamond anvil cell have been investigated up to pressures near 50 GPa. Characterization of these mixtures via X-ray diffraction suggests that several novel K–Cu phases form at these high-pressure conditions. The formation of intermetallic compounds with transition metals is illustrative of an entirely new body of chemistry for the heavy alkali metals, and has profound ramifications on geophysical research suggesting the presence of potassium in Earth's core. Additionally, such alkali metal–transition metal compounds may possess interesting electronic and structural properties, and this research serves as a welcome addition to the study of the K–Cu phase diagram.