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Effects of calcination on the crystallography and nonbiogenic aragonite formation of ark clam shell under ambient condition


Loy, Chee Wah and Matori, Khamirul Amin and Lim, Way Foong and Schmid, Siegbert and Zainuddin, Norhazlin and Abdul Wahab, Zaidan and Alassan, Zarifah Nadakkavil and Mohd Zaid, Mohd Hafiz (2016) Effects of calcination on the crystallography and nonbiogenic aragonite formation of ark clam shell under ambient condition. Advances in Materials Science and Engineering, 2016. art. no. 2914368. pp. 1-8. ISSN 1687-8434; ESSN: 1687-8442


This paper presents a study of crystallographic evolution of disposed ark clam shell (ACS) after calcination at 400–1400°C which was kept at room temperature under ambient condition in Malaysia during nine months. A better understanding of hydration and recarbonation of ACS powder (≤63 μm) after calcination was discovered by PXRD and FTIR. The research focuses on the crystallographic transformation, biogenic calcite decomposition, and unusual atmospheric aragonite formation in ACS after calcination and atmospheric air exposure. Ex situ PXRD showed calcite present in ACS at ≤900°C. ACS transformed to pyrogenic fcc CaO at ≥800°C after three months. Long term atmospheric air exposure of decarbonized ACS caused nucleation of nonbiogenic aragonite, vaterite, calcite, and portlandite. However, in situ PXRD analysis of ACS at instantaneous temperature without cooling process does not indicate the presence of aragonite, vaterite, and portlandite crystals. FTIR spectra revealed CaO–CO2 bond in ACS dissociated with temperature (600–900°C) to form CaO and CO2. Ca–OH bond was also traced in FTIR spectra of ≥700°C. It resulted by hydroadsorption of CaO with H2O in atmospheric air.

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Additional Metadata

Item Type: Article
Subject: Calcination on the crystallography; Nonbiogenic aragonite formation; Ark clam shell
Divisions: Faculty of Science
Institute of Advanced Technology
DOI Number: https://doi.org/10.1155/2016/2914368
Publisher: Hindawi Publishing Corporation
Depositing User: Nurul Ainie Mokhtar
Date Deposited: 27 Feb 2018 08:45
Last Modified: 27 Feb 2018 08:45
Altmetrics: http://www.altmetric.com/details.php?domain=psasir.upm.edu.my&doi=10.1155/2016/2914368
URI: http://psasir.upm.edu.my/id/eprint/54080
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