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The Potential of Low Frequency EPR Spectroscopy in Studying Pottery Artifacts and Pigments.

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Abstract

Non-destructive investigation, chemically fingerprinting, and authentication of ceramic cultural artifacts is a challenging analytical problem. Electron paramagnetic resonance (EPR) spectroscopy is capable of distinguishing between clays based on the paramagnetic metals present, and firing temperature (TF) based on the complexes of these metals formed at different TF values. Unfortunately, the 9 GHz frequency of conventional X-band EPR restricts sample size to a few mm and limits its applicability to small fragments. Low frequency EPR (LFEPR) is based on an EPR spectrometer operating at a few hundred MHz. LFEPR can utilize larger samples on the order of a few cm, but has a lower sensitivity due to the smaller Boltzmann ratio. Additionally, LFEPR may not be capable of detecting a spectral transition if the LFEPR operating frequency is less then the zero-field splitting of the paramagnetic metal complex. We utilized an LFEPR operating at 300 MHz which scans the applied magnetic field between the local Earth’s magnetic field and 26 mT to determine the feasibility of detecting EPR signals from clays, pigments, and glazes. Various clay samples were studied at 100 < TF < 1200 °C. Spectral differences were seen as a function of both clay type and TF. Differences in the LFEPR spectra of Han, Egyptian, and Ultramarine blue support the ability to distinguish among pigments. Paramagnetic impurities in glass may allow distinction between glaze spectra. We have also explored the utility of LFESR by the use of a radio frequency surface coil rather than an enclosed resonator. Although the active volume of the surface coil is ∼1 cm3, objects as large as 20 cm in diameter might be easily characterized with our spectrometer.

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Authors and Affiliations

  1. RIT Magnetic Resonance Laboratory, RIT, Rochester, NY, 14623, USA

    William J. Ryan & Joseph P. Hornak

  2. Independent Researcher, Rochester, NY, USA

    Nicholas Zumbulyadis

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  1. William J. Ryan
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Ryan, W.J., Zumbulyadis, N. & Hornak, J.P. The Potential of Low Frequency EPR Spectroscopy in Studying Pottery Artifacts and Pigments.. MRS Online Proceedings Library 1656, 309–317 (2014). https://doi.org/10.1557/opl.2014.708

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