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. 2019 Aug 16;9:11959. doi: 10.1038/s41598-019-48497-3

Table 1.

List of the doping elements, sorted according to their ionic radius.

Element Al3+ Fe3+ Fe2+ Cr3+ Co2+ Mn2+ Ni2+ Cu2+ Cu+ Ce4+ Bi3+ Ag+
Ionic radius (pm) 67.5 69 75 75.5 79 81 83 87 91 101 117 129
Ionic radius ratio (% of Zn) 76.7 778.4 85.2 85.8 89.8 92 94.3 98.8 103.4 114.8 133 146.6

Ratio of their ionic radius with respect to Zn2+ ionic radius. The valence state mentioned in the table refers to the one of the doping element in its precursor molecule.