RT Journal Article
T1 Effects of partial manganese substitution by cobalt on the physical properties of Pr_(0.7)Sr_(0.3)Mn_(1-x)Co_(x)O_(3) (0 = x=0.15) manganites
A1 Zdiri, Feriel
A1 Alonso, José María
A1 Mnasri, Taoufik
A1 Presa Muñoz De Toro, Patricia Marcela De La
A1 Morales, Irene
A1 Martínez, José Luis
A1 Ben Younes, Rached
A1 Marín Palacios, María Pilar
AB We have investigated the structural, magnetic, and electrical transport properties of Pr_(0.7)Sr_(0.3)Mn_(1-x)Co_(x) O_(3) nanopowders (x = 0, 0.05, 0.10 and 0.15). The Pechini Sol-gel method was used to synthesize these nanopowders. X-ray diffraction at room temperature shows that all the nano powders have an orthorhombic structure of Pnma space group crystallography. The average crystallite size of samples x = 0, 0.05, 0.10, and 0.15 are 33.78 nm, 29 nm, 33.61 nm, and 24.27 nm, respectively. Semi-quantitative chemical analysis by energy dispersive spectroscopy (EDS) confirms the expected stoichiometry of the sample. Magnetic measurements indicate that all samples show a ferromagnetic (FM) to paramagnetic (PM) transition with increasing temperature. The Curie temperature T-C gradually decreases (300 K, 270 K, 250 K, and 235 K for x = 0, 0.05, 0.10, and 0.15, respectively) with increasing Co concentrations. The M-H curves for all compounds reveal the PM behavior at 300 K, while the FM behavior characterizes the magnetic hysteresis at low temperature (5 K). The electrical resistivity measurements show that all compounds exhibit metallic behavior at low temperature (T < T rho) well fitted by the relation rho = rho_(0) + rho_(2)T^(2) + rho_(4.5) T^(4.5) and semiconductor behavior above T rho (T > T rho), for which the electronic transport can be explained by the variable range hopping model and the adiabatic small polaron hopping model. All samples have significant magnetoresistance (MR) values, even at room temperature. This presented research provides an innovative and practical approach to develop materials in several technological areas, such as ultra-high density magnetic recording and magneto resistive sensors.
PB MDPI AG
SN 1996-1944
YR 2023
FD 2023-02-13
LK https://hdl.handle.net/20.500.14352/73333
UL https://hdl.handle.net/20.500.14352/73333
LA eng
NO © 2023 by the authors. Licensee MDPIThis research was funded by the Tunisian Ministry of Higher Education and Scientific Research and by the Ministerio de Ciencia e Innovación (MCINN), grant number PID2021-123112OBC21.
NO Ministerio de Ciencia e Innovación (MICINN)
NO Tunisian Ministry of Higher Education and Scientific Research
DS Docta Complutense
RD 11 abr 2025