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Characterization of bronze Roman coins of the fifth century called nummi through different analytical techniques

Canovaro, Caterina ; Calliari, Irene ; Asolati, Michele ; Grazzi, Francesco ; Scherillo, Antonella

Applied Physics A, 2013, Vol.113(4), pp.1019-1028 [Periódico revisado por pares]

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  • Título:
    Characterization of bronze Roman coins of the fifth century called nummi through different analytical techniques
  • Autor: Canovaro, Caterina ; Calliari, Irene ; Asolati, Michele ; Grazzi, Francesco ; Scherillo, Antonella
  • Assuntos: Engineering ; Physics
  • É parte de: Applied Physics A, 2013, Vol.113(4), pp.1019-1028
  • Descrição: Metallographic techniques, Energy-dispersive X-ray fluorescence (EDXRF), Scanning electron microscopy (SEM) in backscattered-electron mode (BSE) with energy-dispersive microanalysis (EDS) and Time-of-Flight Neutron Diffraction (ToF-ND) have been used to investigate the composition and the microstructure of some 5th century A.D. Roman coins, called nummi. The analysis confirms that the coins were produced by casting Cu-Sn-Pb alloys followed by a weak mechanical working. The presence of surface phenomena, more or less severe depending on the samples, has limited the usefulness of the EDXRF analysis for what concerns the determination of bulk properties. The results of ToF-ND and EDS analysis on cross section are in good agreement and, in addition, through ToF-ND it was possible to derive the phase composition in a non destructive way. The results of analysis show that the flans were obtained for solidification in the mold, then hammered to the desired thickness and finally coined. The content of Sn, higher of 5% identifies a western production, in contrast with what happens in the eastern mints.
  • Idioma: Inglês

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