Nevertheless, the full PDF (𝑔(𝑟)) were also obtained based on applying proper average number density (𝜌_0) (Figure ). The calculated number density for 5Eu and 20Eu were 0.915 ± 5.5x10 -7 and 1.11 ± 7.6x10 -7 Å -3 , respectively. Hence, the coordination number was given in Table . Unfortunately, the calculated coordination number showed significant differences from EXAFS data from previous work, which indicates the inaccuracy of intensity even though no strong texture features were shown in diffraction patterns. The characteristics of TEM only allowed us to get information in a projection view from the sample, which may lead to smaller coordination number. In addition to the atom-atom distance, both PDF and rPDF can provide structural features, including coordination number, average atom density, and atom arrangement periodicity. In this context, the provided reduced PDF adequately described the structural characteristics of Europium in nanosponges and exhibiting a high precision in the average number density. However, the full PDF results diverge slightly from the experimental data obtained through EXAFS result in literature. This variance underscores the need for meticulous consideration in the calculation of the full PDF.