Raman spectra of Nontraditional Compound KO4 and Novel Chemical Reaction of KCl-O2

TL;DR

This study synthesized and characterized the non-traditional compound KO4 at ambient conditions using high-pressure high-temperature methods, revealing new chemical reactions involving unconventional pair-anions relevant for battery research.

Contribution

It reports the synthesis and Raman characterization of KO4 and other novel compounds formed from KCl-O2 under high pressure, providing insights into unconventional chemical reactions.

Findings

KO4 exhibits a characteristic Raman band at 1386 cm-1.

KCl3 decomposes into KCl and Cl2 below 10 GPa.

High pressure facilitates formation of unconventional pair-anions.

Abstract

The non-traditional compound KO4 still existing at ambient conditions was synthesized by the reaction of KCl-O2 under high pressure and high temperature (HPHT) using the diamond anvil cell and the laser heating technology. The KCl-O2 sample was heated at 37 GPa (1800 K) and then the products were measured by Raman technology at room temperature. The acquired 1386 cm-1 characteristic vibration band of KO4 reflects the O-O pair with fractional negative charge. The other reaction products include another non-traditional compound KCl3, a bit KClO4 and intermediate product Cl2. The KCl3 can distinguish 11 Raman peaks and decompose into KCl and Cl2 below 10 GPa during decompression. These novel products show that high pressure promotes oxygen and chlorine forming unconventional pair-anions and polyanions, the novel chemical reaction provides new perspectives for developing new batteries materials and studying batteries reactions.