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chanerwang

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Éó¸åר¼ÒµÄÆÀÓIn fact it is contradictory because using XPS authors detected the presence of europium on BiVO4 surface, then why authors assume that it is into the crystal structure of compound. Also cell volume is lower when sample contains boron and europium than sample BiVO4, normally when some cation, boron or europium, is incorporated into the lattice volume tends to increase.

On the other hand, authors mentioned that samples contained high amount of surface oxygen vacancies, I would like to mention that by using XRD Rietveld analysis it is possible to determine the oxygen vacancies in samples, it is better if authors try to corroborate such affirmation doing XRD Rietveld analysis.

Additionally, through XRD Rietveld method authors can obtain the cell parameters of all samples and compare them in order to corroborate if boron and europium are into the crystal structure, just the crystal size and volume value are not enough evidence.


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