Artificial-neural-network prediction of hexagonal lattice parameters for non-stoichiometric apatites

Kockan, Umit
Ozturk, Fahrettin
Evis, Zafer
In this study, hexagonal lattice parameters (a and c) and unit-cell volumes of non-stoichiometric apatites of M-10(TO4)(6)X-2 are predicted from their ionic radii with artificial neural networks. A multilayer-perceptron network is used for training. The results indicate that the Bayesian regularization method with four neurons in the hidden layer with a tansig activation function and one neuron in the output layer with a purelin function gives the best results. It is found that the errors for the predicted data of the lattice parameters of a and c are less than 1 % and 2 %, respectively. On the other hand, about 3 % errors were encountered for both lattice parameters of the non-stoichiometric apatites with exact formulas in the presence of the T-site ions that are not used for training the artificial neural network.

Citation Formats
U. Kockan, F. Ozturk, and Z. Evis, “Artificial-neural-network prediction of hexagonal lattice parameters for non-stoichiometric apatites,” MATERIALI IN TEHNOLOGIJE, vol. 48, no. 1, pp. 73–79, 2014, Accessed: 00, 2020. [Online]. Available: