Genesis of a solid foam: iron(III) metaphosphate transformation in sol-gel crystallization processes

Poorly crystalline iron(III) metaphosphate (IMP) is obtained by admixture of iron nitrate and sodium metaphosphate aqueous solutions. Under heating, this solid undergoes various transformations, which were followed by x-ray diffraction, IR spectrophotometry, ESR spectroscopy, surface area, and densi...

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Bibliographic Details
Published in:Langmuir 1990-05, Vol.6 (5), p.1013-1016
Main Authors: Pereira de Abreu Filho, Pompeu, Galembeck, Fernando, Gandra, Flavio Cesar Guimaraes, Baesso, Mauro Luciano, Correa da Silva, Edson, Vargas, Helion
Format: Article
Language:English
Subjects:
360601 - Other Materials- Preparation & Manufacture
360602 - Other Materials- Structure & Phase Studies
CALCULATION METHODS
CHEMICAL PREPARATION
Chemistry
COHERENT SCATTERING
Colloidal state and disperse state
DATA
DIFFRACTION
ELECTRON SPIN RESONANCE
Exact sciences and technology
EXPERIMENTAL DATA
General and physical chemistry
INFORMATION
IRON COMPOUNDS
IRON PHOSPHATES
MAGNETIC RESONANCE
MATERIALS SCIENCE
NUMERICAL DATA
OXYGEN COMPOUNDS
PHOSPHATES
PHOSPHORUS COMPOUNDS
RESONANCE
SCATTERING
SOL-GEL PROCESS
SPECTROPHOTOMETRY
STRUCTURAL CHEMICAL ANALYSIS
SURFACE AREA
SURFACE PROPERTIES
SYNTHESIS
TRANSITION ELEMENT COMPOUNDS
X-RAY DIFFRACTION
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Description
Summary:Poorly crystalline iron(III) metaphosphate (IMP) is obtained by admixture of iron nitrate and sodium metaphosphate aqueous solutions. Under heating, this solid undergoes various transformations, which were followed by x-ray diffraction, IR spectrophotometry, ESR spectroscopy, surface area, and density and weight loss determinations. At least three different crystalline phases are formed, at different stages; crystalline and noncrystalline phases coexist, in many situations. IMP yields a solid, rigid foam under heating to t > 620{degree}C and a glass at t {approx equal} 1,200{degree}C. Foam formation is explained, by use of the experimental data, as a result of concurrent water release, gaseous cell formation, and crystallization of the solid mass, without simultaneous fragmentation.
ISSN:0743-7463
1520-5827
DOI:10.1021/la00095a022