Impact of Bi₂O₃ modifier concentration on barium-zincborate glasses: physical, structural, elastic, and radiation-shielding properties.

And n b showing a negative trend with the Bi 3+ concentration. 15 \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$ n_{\text{b}} = \frac{{N_{\text{A}} }}{{V_{\text{m}} }}\mathop \sum \limits_{i} \left( {xn_{\text{c}} } \right)_{i} = \frac{{N_{\text{A}} }}{{V_{\text{m}} }}{\text{m}} $$\end{document} n b = N A V m ∑ i x n c i = N A V m m where m is the average coordination number, and n c is the coordination number of the cation.

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