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The effect of pressure on the intercalation of an ordered kaolinite

Ray L. Frost, J. Theo Kloprogge, Thu Ha Thi Tran and Janos Kristof
The effect of pressure on the intercalation of an ordered kaolinite
American Mineralogist (December 1998) 83 (11-12, Part 1): 1182-1187


Intercalation of an ordered kaolinite with potassium acetate (KCH (sub 3) COO) under a pressure of 20 bars and 220 degrees C, induced new Raman bands at 3590, 3603, and 3609 cm (super -1) in addition to the normal kaolinite bands. These bands are attributed to the inner surface hydroxyls hydrogen bonded to the acetate. It is proposed that the intercalation under 20 bars pressure at 220 degrees C caused the differentiation of the inner surface hydroxyl groups, resulting in the appearance of these additional bands. Diffuse reflectance infrared spectra of the potassium acetate intercalated kaolinite that was formed at 20 bars and at 220 degrees C showed new bands at 3595 and 3605 cm (super -1) . Upon formation of the intercalate at 2 bars and at 120 degrees C additional infrared (IR) bands were found at 3592, 3600, and 3606 cm (super -1) . These IR bands correspond well with the observed Raman spectra. It is proposed that the effect of intercalation of the highly ordered kaolinite under pressure caused the kaolinite to become disordered and this disordering was dependent on the temperature of intercalation. It is suggested that when pressure is applied to the kaolinite crystal in the presence of an intercalating agent, the hydrogen bonds between adjacent layers are broken to create space for the intercalating agent between the layers. A direct result is that the order of the kaolinite crystals shows a decrease resulting in more defect structures. This is evidenced by the additional spectroscopic bands in both the Raman and IR spectra.

ISSN: 0003-004X
EISSN: 1945-3027
Serial Title: American Mineralogist
Serial Volume: 83
Serial Issue: 11-12, Part 1
Title: The effect of pressure on the intercalation of an ordered kaolinite
Affiliation: Queensland University of Technology, Centre for Instrumental and Developmental Chemistry, Brisbane, Queensl., Australia
Pages: 1182-1187
Published: 199812
Text Language: English
Publisher: Mineralogical Society of America, Washington, DC, United States
References: 18
Accession Number: 2000-001200
Categories: Mineralogy of silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables
Secondary Affiliation: University of Veszprem, HUN, Hungary
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute.
Update Code: 200001
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