Year
2001
Degree Name
Master of Engineering (Hons.)
Department
Institute for Superconducting and Electronic Materials
Recommended Citation
Sotirova-Haralambeva, Emilia Velinova, Synthesis, structures, transport and magnetic properties in zinc doped La0.8Sr0.2MnO3 perovskite manganite, Master of Engineering (Hons.) thesis, Institute for Superconducting and Electronic Materials, University of Wollongong, 2001. https://ro.uow.edu.au/theses/2541
Abstract
The La0.8Sr0.2Mn1-xZnxO3 system with x = 0, 0.01, 0,03, 0.05, 0.1,0.15, 0,3, 0.5 and 0.75 was prepared by the solid state reaction and investigated by structural, transport and magnetic properties measurements. X-ray powder diffraction results indicate a single orthorhombic phase over the whole range of x values and an increase in the lattice parameters (a, b, c) with an increase in zinc doping concentration in the studied system. Single phase is retained for x < = 0.3. SEM investigation shows that the average grain size of the La0.8Sr0.2Mn1-xZnxO3 system decreases from 3 um to less than 1 um with increases in the zinc doping level in the system. Results of transport measurements performed by the four-probe technique indicate that the insulator to metal transition temperature, Ti-m, decreases with an increase in the zinc substitution in the Mn site, while the resistivity of the La0.8Sr0.2Mn1-xZnxO3 system increases with an increase in the doping concentration for all doping levels.
Unless otherwise indicated, the views expressed in this thesis are those of the author and do not necessarily represent the views of the University of Wollongong.