Phase transition of aragonite in abalone nacre

Author: An Yuanlin   Liu Zhiming   Wu Wenjian  

Publisher: Taylor & Francis Ltd

ISSN: 0141-1594

Source: Phase Transitions: A Multinational Journal, Vol.86, Iss.4, 2013-04, pp. : 391-395

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Abstract

Nacre is composed of about 95 vol.% aragonite and 5 vol.% biopolymer and famous for its “brick and mortar” microstructure. The phase transition temperature of aragonite in nacre is lower than the pure aragonite. In situ XRD was used to identify the phase transition temperature from aragonite to calcite in nacre, based on the analysis of TG-DSC of fresh nacre and demineralized nacre. The results indicate that the microstructure and biopolymer are the two main factors that influence the phase transition temperature of aragonite in nacre.