Dear Enyuan, LiOH is definitely a layered structure. In such kind of structures, it is likely that extra anisotropic broadening can be caused by “stacking faults”. In your case, peaks with mixed kh and l index are generally broader than those 00l or hk0.
It would require a detailed study but you can also look at my paper https://pubs.acs.org/doi/full/10.1021/acs.inorgchem.6b02247 With best regards, Wojciech Slawinski wslawin...@chem.uw.edu.pl From: rietveld_l-requ...@ill.fr <> On Behalf Of Enyuan Hu Sent: Wednesday, July 20, 2022 5:41 AM To: RIETVELD_L Distribution List <rietveld_l@ill.fr> Subject: understanding peak width broadening during LiOH growth Hi all, I am seeking help on understanding why peak broadens during LiOH crystal development. Background: we have identified LiOH as a major component in the interphase of batteries and we are trying to understand how it evolves. We obtained the Williamson-Hall plot for the LiOH phase as shown below. Black: 1st cycle; Red: 5th cycle; Green: 30th cycle. So the green one has obvious anisotropic broadening and we found literature that suggests this is due to pallet-shaped LiOH. But going from 1st cycle to 30th cycle (black to green), the peak width is in general more broadened. We thought LiOH would grow in size so the peaks should become more sharp. So this is sort of against our expectations. Can such a phenomenon be explained by strain and if so, can anyone provide comments or suggestions? Thank you! Regards Enyuan
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