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Volume 7 Issue 3
Sep.  2005
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ZHANG Gang-sheng, JIA Tai-xuan, DING Shi-lei, HAO Yu-lan. Differential Scanning Calorimetry Analysis of Nacreous Layer from Bivalve Shells of Pinctada Martensii[J]. Journal of Gems & Gemmology, 2005, 7(3): 20-22.
Citation: ZHANG Gang-sheng, JIA Tai-xuan, DING Shi-lei, HAO Yu-lan. Differential Scanning Calorimetry Analysis of Nacreous Layer from Bivalve Shells of Pinctada Martensii[J]. Journal of Gems & Gemmology, 2005, 7(3): 20-22.
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Differential Scanning Calorimetry Analysis of Nacreous Layer from Bivalve Shells of Pinctada Martensii

  • College of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China

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  • Received Date: August 11, 2005
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  • The thermal features of nacre aragonite from bivalve shells of Pinctada martensii are analyzed by using differential scanning calorimetry. It is observed that the thermal transformation of nacre aragonite to calcite is exothermal at about 445℃, whereas the transformation of synthetic aragonite is endothermal at about 498℃. The unusual exothermal transformation of nacre aragonite to calcite is perhaps resulted from the stored excess enthalpy in nanometer-size aragonite of nacre.
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    • References (7)
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