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Infrared spectroscopic study of modern and ancient ivory from sites at jinsha and Sanxingdui, China

机译:金沙和三星岛现代和古代象牙的红外光谱研究

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摘要

Ancient ivory, from the Chengdu Jinsha and Guanghan Sanxingdui sites in China, has been buried for several thousand years. In order to determine the degradation mechanisms and to provide a scientific basis for protecting them, these ancient ivory samples have been compared with modem ivory using infrared spectroscopy in the frequency range 400-4000 cm . By combining chemical analysis data we compare the crystallinity and crystal chemistry of the apatite component, as well as the structural characteristics of the ivory. These investigations showed that the ancient ivory consists almost entirely of hydroxyl-carbonate apatite as the predominant phase. Compared with the modem ivory, the PO_4~(3-) and CO_3~(2-) bands are stronger, the PO_4RF values are obviously greater, and an extra OH~- band at 3569 cm- is observed in the ancient ivory. These results indicate that there is a greater degree of apatite crystallinity in the ancient ivory and also imply that there has been incorporation and recrystallization of CO_3~(2-) in the apatite during burial. Positive correlations have been found between the apatite crystallinity, CO_3~(2-) and OH~ ion contents, and burial time. The organic matter in ancient ivory has been lost or decomposed as the organic bands (e.g. at 1238 cm~(-1) and 1337 cm~(-1)) have disappeared. This may be the main reason that ancient ivory is easily dewatered and readily friable after being unearthed.
机译:来自中国成都金沙和广州三星岛地区的古代象牙,已被埋葬了数千年。为了确定劣化机制并为保护它们提供科学依据,这些古代象牙样本已经与使用红外光谱法在400-4000cm的频率范围内的调制解调器象牙进行比较。通过组合化学分析数据,我们比较磷灰石成分的结晶度和晶体化学,以及象牙的结构特征。这些研究表明,古代象牙几乎完全由作为主要阶段的羟基碳酸盐磷灰石。与调制解调器象牙相比,PO_4〜(3-)和CO_3〜(2-)频段更强,PO_4RF值显然更大,在古代象牙中观察到3569厘米的额外oh〜波段。这些结果表明,古代象牙具有更大程度的磷灰石结晶度,并且还意味着在埋葬期间磷灰石中的CO_3〜(2-)掺入和重结晶。在磷灰石结晶度,CO_3〜(2-)和OH〜离子含量和埋管时间之间发现了阳性相关性。古代象牙中的有机物已经丢失或分解为有机条带(例如,1238cm〜(-1)和1337cm〜(-1))消失了。这可能是古代象牙在出土后容易脱水和易脆弱的主要原因。

著录项

  • 来源
    《Mineralogical Magazine》 |2007年第5期|共10页
  • 作者

    L. WANG; H. FAN; J. Liu;

  • 作者单位

    College of Materials and Chemistry and Chemical Engineering Chengdu University of Technology Chengdu 610059 P. R. China;

    College of Materials and Chemistry and Chemical Engineering Chengdu University of Technology Chengdu 610059 P. R. China;

    College of Materials and Chemistry and Chemical Engineering Chengdu University of Technology Chengdu 610059 P. R. China;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 地质学;
  • 关键词

    ivory; apatite; hydroxylapatite; IR spectroscopy; China;

    机译:象牙色;磷灰石;羟基磷灰石;IR光谱;中国;

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