Journal
NANOTECHNOLOGY
Volume 25, Issue 41, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0957-4484/25/41/415705
Keywords
phase transitions; quantum dots; silver selenide; size stabilization; superionic conductors
Funding
- US Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division
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Superionic materials are multi-component solids in which one sub-lattice exhibits high ionic conductivity within a fixed crystalline structure. This is typically associated with a structural phase transition occurring significantly above room temperature. Here, through combined temperature-resolved x-ray diffraction and differential scanning calorimetry, we map out the nanoscale size-dependence of the Ag2Se tetragonal to superionic phase transition temperature and determine the threshold size for room-temperature stabilization of superionic Ag2Se. For the first time, clear experimental evidence for such stabilization of the highly ionic conducting phase at room temperature is obtained in similar to 2 nm diameter spheres, which corresponds to a >100 degrees C suppression of the bulk phase transition temperature. This may enable technological applications of Ag2Se in devices where high ionic conductivity at room temperature is required.
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