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Expansion behaviour of commercial vermiculites at 1000°C

Marcos, C. / Rodríguez, I.

AbstractCommercial vermiculites from different places were studied in order to know the cause of their different behaviour after abrupt heating at 1000°C. Mössbauer spectroscopy provided Fe²⁺ and Fe³⁺ contents and allowed identification of both tetrahedral and octahedral iron. The Fe²⁺ content was higher in type-2 vermiculites (with K⁺− or >1 and/or Na⁺ and/or Ca²⁺ with or without Mg²⁺ as the principal interlayer cations) than in type-1 vermiculites (with Mg²⁺ or Mg²⁺ and K⁺ (<1) as the principal interlayer cations). The higher iron content seemed to facilitate the fixing of potassium ions. This was responsible of the larger expansion after abrupt heating at 1000°C for 1min.

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Expansion behaviour of commercial vermiculites at 1000°C

Marcos, C. / Rodríguez, I.

AbstractCommercial vermiculites from different places were studied in order to know the cause of their different behaviour after abrupt heating at 1000°C. Mössbauer spectroscopy provided Fe²⁺ and Fe³⁺ contents and allowed identification of both tetrahedral and octahedral iron. The Fe²⁺ content was higher in type-2 vermiculites (with K⁺− or >1 and/or Na⁺ and/or Ca²⁺ with or without Mg²⁺ as the principal interlayer cations) than in type-1 vermiculites (with Mg²⁺ or Mg²⁺ and K⁺ (<1) as the principal interlayer cations). The higher iron content seemed to facilitate the fixing of potassium ions. This was responsible of the larger expansion after abrupt heating at 1000°C for 1min.

Expansion behaviour of commercial vermiculites at 1000°C

Marcos, C. / Rodríguez, I.

AbstractCommercial vermiculites from different places were studied in order to know the cause of their different behaviour after abrupt heating at 1000°C. Mössbauer spectroscopy provided Fe²⁺ and Fe³⁺ contents and allowed identification of both tetrahedral and octahedral iron. The Fe²⁺ content was higher in type-2 vermiculites (with K⁺− or >1 and/or Na⁺ and/or Ca²⁺ with or without Mg²⁺ as the principal interlayer cations) than in type-1 vermiculites (with Mg²⁺ or Mg²⁺ and K⁺ (<1) as the principal interlayer cations). The higher iron content seemed to facilitate the fixing of potassium ions. This was responsible of the larger expansion after abrupt heating at 1000°C for 1min.

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Title:

Expansion behaviour of commercial vermiculites at 1000°C

Contributors:

Marcos, C. (author) / Rodríguez, I. (author)

Published in:

Applied Clay Science ; 48 ; 492-498

Publication date:

2010-02-12

Size:

7 pages

ISSN:

DOI:

https://doi.org/10.1016/j.clay.2010.02.012

Type of media:

Article (Journal)

Type of material:

Electronic Resource

Language:

English

Keywords:

Commercial vermiculites , Heating , Mössbauer spectra

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