journal menu
![[Figure 5]](po5083fig5mag.jpg)
|
|
Figure 5
Differential PDF data obtained from CSH_1.47_1d and CSH_1.47_1y. Top panel (a) compares the d-PDF from CSH_1.47_1y (solid black line) and the experimental PDF of a portlandite standard (solid red line). A scheme of the portlandite structure is shown in the top right corner (yellow octahedra represent the O atoms which form the first shell around Ca). Bottom panel (b) compares the d-PDF from CSH_1.47_1d, from top to bottom, with the same experimental portlandite data as in panel (a) (sub-panel 1: structure model shown on the right side), with the calculated PDF of a portlandite-like nanosheet (sub-panel 2: structure model shown on the right side shows the full structure used for calculation; this model contains 17 Ca atoms coordinated to six O, forming regular octahedra, with Ca—O distances = 2.366 Å and Ca—Ca distances = 3.586 Å), with the calculated PDF of a stack of two of the portlandite-like nanosheets (sub-panel 3: structure model shows the full structure used for calculation), and with the calculated PDF of a 2:1 mix of portlandite nanosheets, identical to those of panel 2, and of stacks of two nanosheets, identical to those of sub-panel 3 (sub-panel 4). Note that the portlandite nanosheet has many similarities with the interlayer Ca(OH)2 proposed by several previous studies (Garbev, Bornefeld et al., 2008  ; Grangeon et al., 2016; Richardson, 2014). |
![[Figure 5]](po5083fig5.jpg)
 | JOURNAL OF APPLIED CRYSTALLOGRAPHY |
ISSN: 1600-5767
access
