Comment on “Photodetection and scintillation characterizations of novel lead-bismuth double perovskite halides” by F. Maddalena et al., J. Mater. Chem. C, 2022, 10, 11266
Gang
Tang 
c
and
Zewen
Xiao
*b
c
and
Zewen
Xiao
*b
Abstract
This Comment re-examines the synthesis of Cs4PbBi2X12 (X = Br, I) double perovskites reported by Maddalena et al. (J. Mater. Chem. C, 2022, 10, 11266). Thermodynamic calculations reveal strongly negative decomposition energies, favoring decomposition into products involving Cs3Bi2X9. Experimental X-ray diffraction patterns do not match simulated trigonal Cs4PbBi2X12 structures but align with Cs3Bi2X9 phases. Optical bandgaps further coincide with decomposition products Cs3Bi2X9. The combined evidence indicates the synthesized materials are phase mixtures, not the purported double perovskites.
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