Design of metastable oxychalcogenide phases by topochemical (de)intercalation of sulfur in La2O2S2

Abstract

Great progress has been made in topochemistry of mobile oxygen anions, but metastable compounds have not yet been achieved by deintercalation of sulfur anions. Here, the authors prepare metastable oxychalcogenide phases by taking advantage of redox-reactive sulfur dimers embedded in a layered oxysulfide.