Abstract Sol gel processed Pb 1-x M x TiO 3 (PMT x ; M = Co, 0≤ x≤ 0.3; Cu, 0≤ x ≤0.2) powders, calcined at 700°C, were characterized by X-Ray Diffraction (XRD) and Raman spectroscopy. XRD analysis revealed well resolved spectra, and we have followed the influence of addition of Co and Cu with Raman spectroscopy. Indeed, the results showed that solubility limit is reached at the concentration of 10% for the samples PCuT x , and that the structure of the samples is not significantly altered by incorporation of Cu, while addition of Co transforms it from tetragonal to pseudocubic. Moreover, Raman analysis shows that Co occupied both A (Pb) and B (Ti) sites of the ABO 3 (PbTiO 3 ) perovskite structure of these materials for x > 10 %, while Cu occupies the same site A (Pb) in the whole range of concentration. To our knowledge, effects of doping with Co and Cu elements and the study of sites occupation in such materials have not been reported. *Author for correspondence Indian Journal of Science and Technology, Vol 8(12), 56348, June 2015 ISSN (Print) : 0974-6846 ISSN (Online) : 0974-5645 Efect of Doping with Cobalt or Copper on the Structure of Lead Titanate PT A. Elbasset 1* , T. Lamchari 1,2 , F. Abdi 1,2 , L. Mrharrab 2 and S. Sayouri 2 1 LSSC Department of Electrical Engineering, FST, Road Immouzer, Fes, Morocco; elbasset.abdelhalim@gmail.com 2 LPTA, Physics Department, Faculty of Science DM, B.P.1796, Fes-Atlas, Morocco Keywords: Co and Cu Doping, Half-value Width, Incorporation, PT, Raman Shift 1. Introduction Lead titanate PbTiO 3 (PT) is a perovskite-type material (ABO 3 structure) which has received much attention due to its interesting properties: pyroelectricity, the change in polarization as a function of temperature 1 , ferroelectricity, variation of the direction of polarization with the electric ield 2,3 and piezoelectricity, ability to transform mechani- cal energy into electrical energy 4,5 , etc. he best-known industrial applications for this type of material are capaci- tors, information storage, piezoelectric actuators, infrared sensors and ultrasonic transducers in medical applications and sonar 6,7 . he PT is also known by a Curie Weiss transi- tion temperature equal to 490°C, a low constant dielectric value of about 200, a spontaneous polarization of about 8 80.10 -5 cm -2 and by a quadracity ratio of about 1.064 9 . he existence of a structural disorder within perovskite compounds induces drastic changes in the physical prop- erties of these materials. In particular, when making a substitution at the site A or B of the structure, it may in some cases lead to disordered dipolar compounds exhib- iting interesting physical properties in regard to the original multiple industrial applications. In this regard, a great number of works have been devoted to the study and the preparation of the PT ceramics doped with vari- ous elements such as zirconium, lanthanum, erbium, calcium or magnesium 3,9–12 . To our knowledge no pub- lication has been dedicated to the study of Co or Cu doped PT. he present work discussed the efect of the incorporation of Co and Cu elements on the crystal structure of lead titanate ceramics. his incorporation in the PT matrix produces changes in the sites A (and) or B depending on the behavior of the latter during this substitution. With the help of X-Ray Difraction (XRD) and Raman spectroscopy, we have studied the efect of the dopant concentration in Co and Cu on the structure and Raman modes of Co-doped PT (PCoT x , 0≤ x ≤30%) and Cu-doped PT (PCuT x , 0≤ x≤ 20%). he results were then analyzed and interpreted. We used the sol-gel method to elaborate these materials due to its advantages, such as low temperature processing, no