pH-dependent liquid order at the solid-solution interface of KH{sub 2}PO{sub 4} crystals
- IMM Solid State Chemistry, Radboud University Nijmegen, Toernooiveld 1, 6525 ED Nijmegen (Netherlands)
We have determined the solid-liquid interface structure of the {l_brace}101{r_brace} and {l_brace}100{r_brace} faces of KH{sub 2}PO{sub 4} (KDP) crystals in contact with a growth solution for three different pH values. Using surface x-ray diffraction data we find in all cases several liquid layers with varying degrees of lateral and perpendicular order. The structural changes are large for the {l_brace}101{r_brace} face and small for the {l_brace}100{r_brace}, which correlates with the changes in the macroscopic growth velocity of these faces. The changes at the {l_brace}101{r_brace} face are likely due to the pH-dependent competition between K{sup +} and H{sub 3}O{sup +} bonding. For the highest pH value crystalline preordering is observed.
- OSTI ID:
- 20787765
- Journal Information:
- Physical Review. B, Condensed Matter and Materials Physics, Vol. 72, Issue 24; Other Information: DOI: 10.1103/PhysRevB.72.245404; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1098-0121
- Country of Publication:
- United States
- Language:
- English
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