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Aragonite–calcite–vaterite: A temperature influenced sequential polymorphic transformation of CaCO3 in the presence of DTPA

DOI: 10.1016/j.materresbull.2013.01.048
Title: Aragonite–calcite–vaterite: A temperature influenced sequential polymorphic transformation of CaCO3 in the presence of DTPA
Journal Title: Materials Research Bulletin
Volume: 48
Issue: 5
Publication Date: May 2013
Start Page: 1906
End Page: 1912
Published online: online 8 February 2013
ISSN: 0025-5408
Author: Shanmukhaprasad Gopi, V.K. Subramanian, K. Palanisamy
Affiliations:
  • Department of Chemistry, Annamalai University, Annamalainagar 608002, Tamilnadu, India
  • Abstract: carbonate was precipitated from calcium chloride using sodium carbonate in the presence of diethylenetriaminepentaacetic acid (DTPA) between 60 and 230 °C. The samples were characterized by FTIR, Raman, XRD and SEM techniques. CaCO3 with different crystal morphologies such as spherolite/datura pod, dumbbell, peanut, were obtained depending on the experimental conditions. The results showed that pure aragonite, calcite and vaterite were formed at low, moderate and high temperatures respectively. A binary mixture of calcite and vaterite was resulted between 150 and 200 °C. The data suggested an unusual conversion of stable calcite to meta stable vaterite at higher temperature in presence of DTPA. The study revealed a novel methodology for the exclusive/individual preparation of different crystalline polymorphs of CaCO3. Formation of pure vaterite above 200 °C divulged the possibility of DTPA as a potential scale inhibitor and boiler sludge conditioner at elevated temperatures.
    Accepted: 23 January 2013
    Received: 28 November 2012
    Keywords: Inorganic compounds; Crystal growth; Electron microscopy; Crystal structure
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