<scp>RHX</scp> Dating: measurement of the Activation Energy of Rehydroxylation for Fired‐Clay Ceramics

Clelland, S.; Wilson, Moira; Carter, Margaret; Batt, C. M

doi:10.1111/arcm.12118

Cited by 12 publications

(21 citation statements)

References 8 publications

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“…The data used by H2011 indicate a high variability in the exponent values of 1/ N , similar to that observed in archeological fired‐clay ceramic artifacts . It is worth mentioning that this variability does not originate from the energy of activation characterizing each studied sample . It is possible that the 1/ N value is an intrinsic property of the earthenware, depending on the nature of clays and/or on the temperature reached during the original firing of the ceramics.…”

Section: Resultssupporting

confidence: 61%

“…8 It is worth mentioning that this variability does not originate from the energy of activation characterizing each studied sample. 9,17 It is possible that the 1/N value is an intrinsic property of the earthenware, depending on the nature of clays and/or on the temperature reached during the original firing of the ceramics. It may also be possible that the experimental conditions (temperature, relative humidity) have some influence on the underlying process.…”

Section: Discussionmentioning

confidence: 99%

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Experimental Variability in Kinetics of Moisture Expansion and Mass Gain in Ceramics

Goff

Gallet

2014

J. Am. Ceram. Soc.

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The rehydroxylation dating method of archeological fired‐clay artifacts relies on the reliability of the (time)1/4 power law model considered for long‐term moisture expansion and mass gain in ceramics. Here, we reanalyze different moisture expansion datasets that were previously used to verify this model. We show that these data obey an accurate (time)1/N power law, but they reveal a variability in the values of the exponent 1/N between ~1/2 and ~1/4. It is possible that this value is an intrinsic property of ceramics, naturally varying between a behavior governed by a Brownian process (t1/2 power law) and a behavior controlled by a one‐dimensional diffusion process (t1/4 power law).

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Section: Resultssupporting

confidence: 61%

Section: Discussionmentioning

confidence: 99%

Experimental Variability in Kinetics of Moisture Expansion and Mass Gain in Ceramics

Goff

Gallet

2014

J. Am. Ceram. Soc.

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“…The temperatures are measured in kelvin (K). The activation energy is the minimum energy required to start the chemical reaction . The universal gas constant is R = 8.3144621 J·(K·mol) −1 .…”

Section: Determination Of the Activation Energymentioning

confidence: 99%

“…The samples may come, for example, from the same archeological stratum; provided by an archeologist who determines, based on excavation information, that they have the same age. Clelland et al . found that even ceramic sherds broken from some particular plates had activation energies that differed significantly from one another.…”

Section: Determination Of the Effective Lifetime Temperature And Rhx Agementioning

confidence: 99%

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RHX Dating of Archeological Ceramics Via a New Method to Determine Effective Lifetime Temperature

2014

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Determining the absolute chronology of ceramic artifacts has significant implications for archeological and historical research. Wilson, Hall et al. recently suggested a new technique for direct absolute dating of archeological ceramics based on a moisture‐induced chemical reaction, called rehydroxylation (RHX) dating. RHX dating proceeds by measuring the mass of chemically combined water in the ceramics in the form of OH hydroxyls, and the mass gain rate at the Effective Lifetime Temperature (ELT) that the ceramics experienced over its lifetime. To date, ELT determinations have been based on estimates of the ceramic's lifetime temperature history; taking into account weather and climate data and the depth at which the artifact was found. The uncertainty in determining the ELT can be a major component of the overall dating uncertainty. Here, we propose an alternative method which relies minimally on weather and climate data, and provides more precise determinations of the ELT and the ceramic age. The proposed method (SAS: Same Age Samples) involves a minimum of four measurements of the RHX mass gain rate constant for two ceramic samples of the same age at two temperatures. We show via simulations that the proposed SAS method can determine the ELT with a precision of 0.2 K which is comparable to the best ELT determination based on lifetime temperature history, and also comparable to available microbalance temperature resolutions of around 0.1 K. The corresponding percent age error is then 1.4%, or 43 yr for a 3000‐yr‐old ceramic. The proposed SAS method should be tested with ceramic samples of different ages, whose ELT are well‐known.

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The Future for the Holistic Analysis of Porcelains

Edwards

2020

18th and 19th Century Porcelain Analysis

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RHX Dating: measurement of the Activation Energy of Rehydroxylation for Fired‐Clay Ceramics

Abstract: In rehydroxylation (RHX)

Cited by 12 publications

References 8 publications

Experimental Variability in Kinetics of Moisture Expansion and Mass Gain in Ceramics

Experimental Variability in Kinetics of Moisture Expansion and Mass Gain in Ceramics

RHX Dating of Archeological Ceramics Via a New Method to Determine Effective Lifetime Temperature

The Future for the Holistic Analysis of Porcelains

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