xxiii πανελληνιο ÏƒÏ Î½ÎµÎ´ÏÎ¹Î¿ Ï†Ï ÏƒÎ¹ÎºÎ·Ï‚ στερεας καταστασης & επιστημης ...

Modeling and quantitative phase analyses of archaic pottery
I.M.Siouris 1 , W. Kockelmann 2
1
Department of Production and Management Engineering , Democritus University of Thrace
Xanthi, 67 1 00 Xanthis, Greece
2 Rutherford Appleton Laboratory, ISIS Facility, OX11 0QX Chilton, United Kingdom
*jsiou@pme.duth.gr
Archaeological pottery fragments from two sites in Greece were investigated with neutron diffraction. The measurements
included 4th-century BC pottery from the area of Krania and fragments from the Karabournaki excavation site in northern
Greece. The neutron diffraction analyses aimed at delivering quantitative phase fractions which are to be used for identifying
characteristic signatures of the types of pottery. Further more, a new computer program (Amphoreas) was developed to deal
with the various problems that mineral analysis of multiphase ceramics presents.
[Fig.1]: Experimental (+), calculated (-)
and difference of the diffraction
patterns from the Krania sample.
[Fig.2]: Initial modeling, Krania sample,
using the program Amphoreas
[Fig.4]:Final model and fitted parameters.
*Bank 2:Indicates forward scattering with detector position at :2θ= 52.6 ◦ and Bank 3:Indicates backscattering with detector
position at:2θ= 122.2°.
Neutron data on two 4th century B.C. pottery fragments from the specified areas was collected at the ROTAX
instrument, using the TOF neutron diffraction facility at ISIS. The data was analysed with the GSAS software and the results
were compared with the analysis from Amphoreas software. The neutron diffraction analyses aimed at determining the main
crystallographic phases in this type of pottery. The Plots [1] and [4] show the analysed diffraction patterns of the two
different fragments. Table [1] shows the final results of the quantitative phase evaluation using both computer software :
full pattern analysis from GSAS and the profile/ phase decomposition software Amphoreas. The results are almost
identical. The deviation in the calculating phases are within 0.03% , a factor well inside the bounds of the experimental
error. The Krania shards are characterised by a high amount of feldspars indicating larger kiln temperatures.
230