(color online) (a) Representative TEM micrographs of Cu₃SbSe₄ nanocrystallines, and the corresponding HRTEM images, electron diffraction patterns and EELS analysis results.^[59] Reproduced from Ref. [59] with permission from the Royal Society of Chemistry. [(b) and (c)] Temperature-dependent κ and zT values for micro- and nano-crystalline Cu₃SbSe₄.^[56,59]