Anion exchange in Zn–Al layered double hydroxides: In situ X-ray diffraction study

2010 ◽  
Vol 495 (1-3) ◽  
pp. 73-76 ◽  
Author(s):  
Andrei N. Salak ◽  
João Tedim ◽  
Alena I. Kuznetsova ◽  
Mikhail L. Zheludkevich ◽  
Mário G.S. Ferreira
Keyword(s):  
Diffraction Study ◽  
Anion Exchange ◽  
Layered Double Hydroxides ◽  
X Ray Diffraction ◽  
X Ray ◽  
Double Hydroxides

scholarly journals Interlayer intercalation and arrangement of 2-mercaptobenzothiazolate and 1,2,3-benzotriazolate anions in layered double hydroxides: In situ X-ray diffraction study

2016 ◽  
Vol 233 ◽  
pp. 158-165 ◽  
Author(s):  
Maria Serdechnova ◽  
Andrei N. Salak ◽  
Filipe S. Barbosa ◽  
Daniel E.L. Vieira ◽  
João Tedim ◽  
...  
Keyword(s):  
Diffraction Study ◽  
Layered Double Hydroxides ◽  
X Ray Diffraction ◽  
X Ray ◽  
Double Hydroxides

Probing the thermal decomposition process of layered double hydroxides through in situ 57Fe Mössbauer and in situ X-ray diffraction experiments

2006 ◽  
Vol 42 (2) ◽  
pp. 534-538 ◽  
Author(s):  
Daniel X. Gouveia ◽  
Odair P. Ferreira ◽  
Antonio G. Souza Filho ◽  
M. G. da Silva ◽  
J. A. C. de Paiva ◽  
...  
Keyword(s):  
Thermal Decomposition ◽  
Layered Double Hydroxides ◽  
Decomposition Process ◽  
X Ray Diffraction ◽  
Thermal Decomposition Process ◽  
X Ray ◽  
57Fe Mössbauer ◽  
Double Hydroxides

Structural and microstructural changes during anion exchange of CoAl layered double hydroxides: anin situX-ray powder diffraction study

2010 ◽  
Vol 43 (3) ◽  
pp. 434-447 ◽  
Author(s):  
Rune E. Johnsen ◽  
Frank Krumeich ◽  
Poul Norby
Keyword(s):  
Phase Transformation ◽  
Exchange Reaction ◽  
Anion Exchange ◽  
Powder Diffraction ◽  
Layered Double Hydroxides ◽  
Two Phase ◽  
X Ray ◽  
Double Hydroxides ◽  
Anion Exchange Reaction

Anion-exchange processes in cobalt–aluminium layered double hydroxides (LDHs) were studied byin situsynchrotron X-ray powder diffraction (XRPD). The processes investigated were CoAl–CO3→ CoAl–Cl → CoAl–CO3, CoAl–Cl → CoAl–NO3and CoAl–CO3→ CoAl–SO4. The XRPD data show that the CoAl–CO3→ CoAl–Cl process is a two-phase transformation, where the amount of the CoAl–CO3phase decreases exponentially while that of the CoAl–Cl phase increases exponentially. Energy-dispersive X-ray spectroscopy (EDXS) studies of a partially chloride-exchanged CoAl–CO3LDH sample along within situXRPD data suggested that the individual particles in the CoAl–CO3sample are generally anion-exchanged with chloride one at a time. In contrast with the CoAl–CO3→ CoAl–Cl transformation, the XRPD data show that the reverse CoAl–Cl → CoAl–CO3process is a one-phase transformation. Rietveld refinements indicate that the occupancy factors of the carbon and oxygen sites of the carbonate group increase, while that of the chloride site decreases. In the CoAl–Cl → CoAl–NO3anion-exchange reaction, the XRPD patterns reveal the existence of two intermediate phases in addition to the initial CoAl–Cl and final CoAl–NO3phases. Thein situdata indicate that one of these intermediates is a mixed nitrate- and chloride-based LDH phase, where the disorder decreases as the nitrate content increases. The XRPD data of the partial CoAl–CO3→ CoAl–SO4anion-exchange reaction show that the process is a two-phase transformation involving a sulfate-containing LDH with a 1H polytype structure.

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

2011 ◽  
Vol 700 ◽  
pp. 67-70
Author(s):  
Akihiro Shimamura ◽  
Linus Perander ◽  
Eiji Kanezaki ◽  
Mark Ian Jones ◽  
James B. Metson
Keyword(s):  
High Temperature ◽  
Thermal Behavior ◽  
Layered Double Hydroxides ◽  
Layer Structure ◽  
Ex Situ ◽  
X Ray Diffraction ◽  
Hydrogen Phosphate ◽  
X Ray ◽  
Double Hydroxides

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.

scholarly journals Structural analysis of defects in layered double hydroxides and related mixed oxides

2019 ◽  
Vol 62 (1-2) ◽  
pp. 39-54
Author(s):  
N.N. Leont’eva ◽  
V.A. Drozdov ◽  
O.B. Belskaya ◽  
S.V. Cherepanova
Keyword(s):  
Layered Double Hydroxides ◽  
Mixed Oxides ◽  
Simulation Method ◽  
X Ray Diffraction ◽  
Structural Mechanism ◽  
X Ray ◽  
Physicochemical Methods ◽  
The Difference ◽  
Double Hydroxides

This article provides an overview of the results of studying the defects in the structure of MgAl and NiAl layered double hydroxides and their thermal decomposition products up to 1000 °C, obtained over the last 10 years in the laboratory of analytical and physicochemical methods of research at the Institute of Hydrocarbons Processing of the SB RAS. The presented results were performed using the X-ray diffraction pattern simulation method for onedimensional (1D) disordered crystals. Changes in the type of structure defects are found depending on the calcination temperature, including in situ X-ray diffraction. A structural mechanism for the formation of a dehydrated phase at T=200 °C is proposed. New models of MgAl and NiAl oxide structures are presented. The structures of the phases included in the products of hydration of oxides are established. The difference in the behavior of oxides during hydration is explained.

In situ time resolved wide angle X-ray diffraction study of nanotube carpet growth: Nature of catalyst particles and progressive nanotube alignment

Carbon ◽  
2015 ◽  
Vol 87 ◽  
pp. 246-256 ◽  
Author(s):  
Périne Landois ◽  
Mathieu Pinault ◽  
Stéphan Rouzière ◽  
Dominique Porterat ◽  
Cristian Mocuta ◽  
...  
Keyword(s):  
Diffraction Study ◽  
Wide Angle ◽  
X Ray Diffraction ◽  
Time Resolved ◽  
X Ray

Structural evolution of NASICON-type Li1+xAlxGe2−x(PO4)3 using in situ synchrotron X-ray powder diffraction

2016 ◽  
Vol 4 (20) ◽  
pp. 7718-7726 ◽  
Author(s):  
Dorsasadat Safanama ◽  
Neeraj Sharma ◽  
Rayavarapu Prasada Rao ◽  
Helen E. A. Brand ◽  
Stefan Adams
Keyword(s):  
Solid Electrolyte ◽  
Diffraction Study ◽  
Powder Diffraction ◽  
Structural Evolution ◽  
X Ray Diffraction ◽  
X Ray ◽  
Nasicon Type ◽  
Precursor Glass

In situ synchrotron X-ray diffraction study of the synthesis of solid-electrolyte Li1+xAlxGe2−x(PO4)3 (LAGP) from the precursor glass reveals that an initially crystallized dopant poor phase transforms into the Al-doped LAGP at 800 °C.

In situ X-ray diffraction study of chrysotile at high P–T conditions: transformation to the 3.65 Å phase

2021 ◽  
Vol 48 (10) ◽  
Author(s):  
Sergey V. Goryainov ◽  
John S. Tse ◽  
Serge Desgreniers ◽  
Saori I. Kawaguchi ◽  
Yuanming Pan ◽  
...  
Keyword(s):  
Diffraction Study ◽  
X Ray Diffraction ◽  
X Ray
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