Fig. 1

Conventional cell of the normal spinel type and the CE feature models"

Fig. 2

Constitution elements of the normal spinel oxides AB$_{2}$O$_{4}$"

Table 1

Fundamental features of elements and simple substances"

Table 2

Correlation coefficient $R^{2}$ and RMSE of the predictions of formation energies in the testing data sets by the eight CE feature models"

Table 3

Correlation coefficient $R^{2}$ and RMSE of the prediction of lattice constants in the testing data sets by the eight CE feature models"

Fig. 3

Comparisons of the formation energies between the DFT calculations and the predictions of the eight CE feature models"

Fig. 4

Comparisons of the lattice constants between the DFT calculations and the predictions of the eight CE feature models"

Fig. 5

Statistical distribution histogram of the formation energies and lattice constants predicted by CE-8 feature model"

Fig. 6

Heat map of the formation energies predicted by ML"

Fig. 7

Heat map of the lattice constants after reduction of the average ion radius of A and B cations"

Table 4

Experimental values, DFT calculation values, and ML prediction values of the formation energies of some known spinel oxides"

Table 5

Experimental values, DFT calculation values, and ML prediction values of the band gap of some known spinel oxides"

Fig. 8

Comparisons of the experimental lattice constants of 141 known spinel oxide structures with the results calculated by DFT and predicted by ML"