Effect of relative humidity on the interlayer spacing of phosphate intercalated Mg, Al layered double hydroxide (hydrotalcite‐like) crystals

The availability of water and the type of interlayer anions present affect the arrangement and interlayer spacing of layered double hydroxide (LDH). A systematic study of the effect of relative humidity (RH) on the basal spacing of phosphate intercalated, magnesium aluminum LDHs (MgAl–PO4 LDH) was c...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 2025-02, Vol.108 (2), p.n/a
Main Authors: Reed, Titus, Wonderling, Nichole, Gevaudan, Juan Pablo, Mauro, John C.
Format: Article
Language:English
Subjects:
Aluminum
cements
Hydration
Hydroxides
Interlayers
Magnesium
phosphates
Relative humidity
structure
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Summary:The availability of water and the type of interlayer anions present affect the arrangement and interlayer spacing of layered double hydroxide (LDH). A systematic study of the effect of relative humidity (RH) on the basal spacing of phosphate intercalated, magnesium aluminum LDHs (MgAl–PO4 LDH) was conducted, confirming that MgAl‐PO4 LDH exhibit distinct interlayer spacing corresponding to separate low‐ and high‐hydration states produced when exposed to low and high humidity conditions. The transition from the low‐ to high‐hydration form begins when RH exceeds 33% and is accompanied by the transition from one to two interlayers of water. An improved understanding of the effect of RH on MgAl–PO4 LDHs will enable more accurate atomistic modeling and experimental characterization of MgAl–PO4 LDHs and may lead to improvements in the tunability of MgAl‐PO4 LDHs for commercial applications such as slow‐release fertilizer.
ISSN:0002-7820
1551-2916
DOI:10.1111/jace.20178