This work presents the results of the analysis done on obsidians samples that belong to three archeological collections at the Museum of Archeology and Anthropology of San Marcos University (MacNeish's collection, • dated toan age 8000- 3500 b. C.) and the I.N.C. Regional Museum at lea (Maymi and Casa Vieja collections, corresponding to the Middle Horizon period 800 a. D.). Additionaly, with the idea ofundertaking future work on the establishment of trade routes and provenience studies in Andean populations, sorne obsidian samples from volcanic sources near to the gathering points are studied. 57Fe Mossbauer spectroscopy (MS), X Ray Fluorescence, Proton Induced X- Ray Emission Spectroscopy (PIXE), Inductively Coupled Plasma-Atomic Emission Spectroscopy (ICP-AES) and Inductively Coupled Plasma-Mass Spectroscopy (ICP-MS) were used to analysis. MS study provides the cation ratio Fe2+/Fe3,...

In this work, we study the synthesis process and structural and magnetic characterization of the ?-Al5Fe2 intermetallic alloy obtained by the arc-melting technique. Subsequently, in order to obtain homogeneous crystalline phase, all melted samples were annealed at 847?C during 2 days, and then quenched into water. The structural and micro-structural characterization of the samples were performed by X-ray diffraction and,57Fe transmission Mössbauer spectroscopy, while the morphological study was performed using scanning electron microscopy. Moreover, magnetic characterization was carried out using vibrating sample magnetometer. X-ray fluorescence was employed for elemental characterization. The results indicate that it is possible to employ the arc-melting technique to synthesize the ?-Al5Fe2 intermetallic phase with high structural quality: orthorhombic crystalline structure and Cmcm sp...