Determining firing temperature of clay-based archaeological materials with FTIR absorptivity method

IF 1.5 3区 地球科学 0 ARCHAEOLOGY
Archaeometry Pub Date : 2025-01-11 DOI:10.1111/arcm.13057
Yi Gao, Siran Liu, Zhenfei Sun
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引用次数: 0

Abstract

FTIR analysis has been proven to be a useful tool in measuring the firing temperature of archaeological sediments and ceramics. A recent development of this method is the finding of a negative correlation between absorptivity of 1030 cm−1 band and the firing temperatures. With potassium ferricyanide (K3[Fe (CN)6]) added as an internal standard, the 1030 cm−1 absorptivity can be measured quantitatively to reflect firing temperature of samples. However, the following investigations show that the 1030 cm−1 absorptivity can also be influenced by a series of other factors including homogeneity of sample, the mixing duration between sample, internal standard, and KBr, as well as grinding time of sample and internal standard. This research quantifies the influence of these factors and recommends the best practice for using this method. The heat-induced absorptivity change of characteristic bands of archaeological clay-based materials is then monitored, revealing that 1030 cm−1 band was the most optimal temperature indicator. Based on a series of Kruskal-Wallis one-way analyses, it is determined that for samples fired over 400°C, the absorptivity ratio of 1030 cm−1/778 cm−1 can be used to estimate its original firing temperature. However, for those fired below 400°C, K3[Fe (CN)6] has to be added and the ratio of 1030 cm−1/2117 cm−1 is more proper for quantifying its original firing temperature. The sediments from two different sites were then artificially fired to varied temperatures and tested following the analytical protocol established in this research. The results demonstrate the high accuracy of this method and its great potential in future study of ancient pyrotechnologies.

用红外光谱法测定粘土基考古材料的烧成温度
FTIR分析已被证明是测量考古沉积物和陶瓷烧成温度的有效工具。该方法的最新发展是发现1030cm−1波段的吸光率与烧制温度之间存在负相关关系。加入铁氰化钾(K3[Fe (CN)6])作为内标,定量测量1030 cm−1的吸光度,反映样品的烧成温度。然而,接下来的研究表明,1030 cm−1的吸光度还会受到一系列其他因素的影响,包括样品的均匀性、样品、内标和KBr之间的混合时间以及样品和内标的研磨时间。本研究量化了这些因素的影响,并推荐了使用该方法的最佳实践。然后对考古粘土基材料特征波段的热吸收率变化进行了监测,发现1030 cm−1波段是最理想的温度指标。基于一系列的Kruskal-Wallis单向分析,确定了在400°C以上烧制的样品,吸收比为1030 cm−1/778 cm−1可以用来估计其原始烧制温度。然而,对于低于400°C的烧制物,必须添加K3[Fe (CN)6],并且1030 cm−1/2117 cm−1的比例更适合用于量化其原始烧制温度。然后将来自两个不同地点的沉积物人工烧制到不同的温度,并按照本研究中建立的分析方案进行测试。结果表明,该方法具有较高的准确性,在今后的古代烟火研究中具有很大的潜力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Archaeometry
Archaeometry 地学-地球科学综合
CiteScore
3.60
自引率
12.50%
发文量
105
审稿时长
6 months
期刊介绍: Archaeometry is an international research journal covering the application of the physical and biological sciences to archaeology, anthropology and art history. Topics covered include dating methods, artifact studies, mathematical methods, remote sensing techniques, conservation science, environmental reconstruction, biological anthropology and archaeological theory. Papers are expected to have a clear archaeological, anthropological or art historical context, be of the highest scientific standards, and to present data of international relevance. The journal is published on behalf of the Research Laboratory for Archaeology and the History of Art, Oxford University, in association with Gesellschaft für Naturwissenschaftliche Archäologie, ARCHAEOMETRIE, the Society for Archaeological Sciences (SAS), and Associazione Italian di Archeometria.
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