Mossbauer and mineral magnetic studies on archaeological potteries from Adhichanallur, Tamilnadu, India
Φόρτωση...
Ημερομηνία
Συγγραφείς
Venkatachalapathy, R.
Bakas, T.
Basavaiah, N.
Deenadayalan, K.
Τίτλος Εφημερίδας
Περιοδικό ISSN
Τίτλος τόμου
Εκδότης
Περίληψη
Τύπος
Είδος δημοσίευσης σε συνέδριο
Είδος περιοδικού
peer reviewed
Είδος εκπαιδευτικού υλικού
Όνομα συνεδρίου
Όνομα περιοδικού
Hyperfine Interactions
Όνομα βιβλίου
Σειρά βιβλίου
Έκδοση βιβλίου
Συμπληρωματικός/δευτερεύων τίτλος
Περιγραφή
Megalithic potteries collected from Adhichanallur, Tamilnadu, India ( Lat. 8 44'N; Long. 77. 42'E) have been subjected to various spectroscopic and rock magnetic studies. The type of clay, their origin, level of structural deformation due to firing, firing temperature and atmospheric condition followed during making the potteries are analyzed. The potteries were subjected to Mossbauer and X- ray diffraction studies to analyze the iron phases in them. It is found that the samples were made of local clay ( red clay), fired above 600. C under open atmospheric and/ or reduced atmospheric conditions and air has been allowed during cooling. The Mossbauer spectra reveal the presence of Fe(3+), Fe(2+) and iron oxides of hematite and magnetite. The firing temperature and firing conditions established from Mossbauer studies are similar to the observation made from FT- IR studies. The magnetic mineral types, the mass fractions and the domain states of the constituent magnetic grains were elucidated from a range of rock magnetic measurements including variation of susceptibility with low field, frequency and temperature, hysteresis parameters and isothermal remanence acquisition data. The magnetic mineralogy of most pottery samples was dominated by magnetite/( titano) magnetite, while magnetic grain size spectrum varies from very fine ( super paramagnetic) to fine ( stable single domain, pseudo single domain). The reversible thermo magnetic behavior reflects no mineralogical transformations during reheating and all the samples show same Curie temperature 580C due to magnetite. From the above information it is demonstrated that these samples are suitable for determining the reliable ancient geomagnetic field intensity values existed during that period.
Περιγραφή
Λέξεις-κλειδιά
archaeological pottery, mosssbauer spectroscopy, rock-magnetism, sample selection, ceramics, clays
Θεματική κατηγορία
Παραπομπή
Σύνδεσμος
<Go to ISI>://000261061900012
http://www.springerlink.com/content/w50565383p97215l/fulltext.pdf
http://www.springerlink.com/content/w50565383p97215l/fulltext.pdf
Γλώσσα
en
Εκδίδον τμήμα/τομέας
Όνομα επιβλέποντος
Εξεταστική επιτροπή
Γενική Περιγραφή / Σχόλια
Ίδρυμα και Σχολή/Τμήμα του υποβάλλοντος
Πανεπιστήμιο Ιωαννίνων. Σχολή Επιστημών και Τεχνολογιών. Τμήμα Βιολογικών Εφαρμογών και Τεχνολογιών