Open AccessCaF 2 solid‐state electrolytes prepared by vapor pressure exposure and solid synthesis for defect and ionic conductivity tuning
Author(s) -
Molaiyan Palanivel,
Witter Raiker
Publication year - 2020
Publication title -
material design & processing communications
Language(s) - English
Resource type - Journals
ISSN - 2577-6576
DOI - 10.1002/mdp2.76
Subject(s) - ionic conductivity , materials science , scanning electron microscope , crystallite , conductivity , dielectric spectroscopy , electrolyte , analytical chemistry (journal) , ionic bonding , fast ion conductor , vapour pressure of water , electrochemistry , vapor pressure , relative humidity , ion , chemistry , composite material , electrode , metallurgy , organic chemistry , chromatography , physics , thermodynamics
CaF 2 nano‐crystalline materials were synthesized by applying vapor pressure (RH 74 %) treatment and high‐energy ball‐milling. The resulting fluoride electrolytes were examined by X‐ray diffraction (XRD), Scanning Electron Microscopy (SEM) and Nuclear Magnetic Resonance (NMR) studies revealing cubic structure with a crystallite size of 13 nm of particles with a typical size of 65 nm. The ionic conductivity was observed by Electrochemical Impedance Spectroscopy (EIS) which provided a maximum of 4.6·10 −6 S·cm −1 at room temperature. Comparing with previous results obtained at higher relative humidity, this parameter can be used for tuning defects and ionic conductivity providing a path to optimize conditions for electrochemical applications.