Fig. 5
From: Electrochemically driven conversion reaction in fluoride electrodes for energy storage devices
a In situ X-ray PDF profiles of oxyfluoride during the first cycling. Distances characteristic of rock salt intermediate is indicated by arrows. Relative peak intensity is reflected from the color change. b Simulated PDFs corresponding to pristine and amorphous rutile phases, rock salt phase, and Fe nanoparticles. c Fe contained phase ratio and evolution during conversion reaction, estimated from PDF profile fitting. d Scheme of converted Fe nanostructure comparison among Fe oxyfluorides, fluorides, and oxides. The dominant Fe particle size (bars), average particle–particle separation (arrows), and number of well-defined neighboring particles are indicated (reproduced with permission from ref. 36,38, copyright American Chemical Society 2013 and 2014, respectively)
