Observation of a Collapsing Layer Structure in Mg/Al Layered Double Hydroxides with Interlayer Hydrogen Phosphate by High Temperature In Situ X-Ray Diffraction with Synchrotoron Radiation

Abstract:

The collapsing layer structure of hydrogen phosphate intercalated Mg/Al-layered double hydroxides (LDH-HPO₄) was investigated by high temperature in-situ X-ray diffraction with synchrotron radiation (in-situ XRD). The thermal behavior of the layer structure of LDH-HPO₄ showed the same behavior in both in-situ and ex-situ XRD up until 109 °C as previously reported. The basal spacing of LDH-HPO₄ continuously decreases above this temperature and finally the layer structure of LDH-HPO₄ collapses. Another diffraction peak, d₁₁₀, which gives a lattice constant a₀, decreases at 62 °C, keeps constant to 120°C, increases up to 176°C and again keeps constant until the layer collapse. In this study, the different thermal behavior is observed between two reflections by in-situ XRD measurement, which explains the mechanism of the collapse of the layer structure in LDH-HPO₄.

• Periodical: Materials Science Forum (Volume 700)
• Pages: 67-70
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.700.67
• Online since: September 2011
• Authors: Akihiro Shimamura, Linus Perander, Eiji Kanezaki, Mark Ian Jones, James B. Metson
• Keywords: In Situ X-Ray Diffraction (XRD), Layered Double Hydroxides (LDHs), Mg/Al-LDH

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