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. 2023 Mar 20;16(6):2473. doi: 10.3390/ma16062473

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© 2023 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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Na, Al, Ca atomic percentages at the outer and inner areas (A, B: average values of each inner area, see Figure 15b and Figure 18; Numbers: analysis results of the points in the outer area; and Surface: average value of the outer area, see Figure 19).