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![[Figure 4]](po5083fig4mag.jpg)
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Figure 4
Left panel: experimental (black solid line), calculated (red solid line) and residual (grey solid line) PDFs of samples having target Ca/Si ratios of 0.6, 0.8, 1 and 1.2 sorted, from top to bottom, by increasing Ca/Si ratio and then by increasing synthesis time. Right panel: evolution of the abundance of Si vacancies as a function of sample Ca/Si ratio. The present data (filled red stars) are compared with literature data obtained using 29Si NMR [the symbols square, circle, triangles pointing up, down, left and right, diamond, and octahedron, respectively, refer to data from Cong & Kirkpatrick (1996  ), Chen et al. (2004), Cong & Kirkpatrick (1996), Brunet et al. (2004), Beaudoin et al. (2009), Damidot et al. (1995), Noma et al. (1998) and Goñi et al. (2010)]. |
![[Figure 4]](po5083fig4.jpg)
 | JOURNAL OF APPLIED CRYSTALLOGRAPHY |
ISSN: 1600-5767
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