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Aziz Nfissi,Yahya Ababou,Salaheddine Sayouri,Lamiae Mrharrab,Fouzia Saadaoui,Elmaati Ech-chamikh,Taj-dine Lamcharfi 한양대학교 세라믹연구소 2020 Journal of Ceramic Processing Research Vol.21 No.2
A series of Ce-doped BaTi0.97Y0.03O3 powder samples with the composition (Ba1-xCex)(Ti(0.97-x/4)Y0.03)O3 (x = 0.00, 0.01, 0.03, 0.05,0.07 and 0.09) were prepared using the sol gel process and calcined at a relatively low temperature (950°C/4h) and theirstructural and piezoelectric properties investigated. From structural investigations, it was observed that the samples crystallizein the pseudo cubic phase with the presence of secondary phases for concentrations such as x > 0.03. Piezoelectric parameterswere determined and their thermal behavior investigated. The impedance study indicated the dominance of the resistance ofthe grain boundaries compared to that of grains in BaTi0.97Y0.03O3 sample.
Fouzia Saadaoui,Salaheddine Sayouri,Abdelilah Rjeb,Badr Akharkhach,Aziz Nfissi 한양대학교 세라믹연구소 2019 Journal of Ceramic Processing Research Vol.20 No.2
In this work, CuO thin films were deposited by sol gel spin-coating technique on microscope glass substrates. Copper acetatewas used as the starting salt material source, ethanol as solvent and monoethanolamine as stabiliser. The as-coated films werepreheated at 300 oC for 10 min and then annealed using two different temperatures. As the annealing temperature wasincreased from 500 oC to 600 oC, along with thickness, an improvement of the structural properties was concluded from XRDand SEM analyses. I-V characteristics of the films corroborated this result and showed existence of a normal Ohmic behaviourof these films. The average crystallite size estimated from XRD analysis was found to increase from 28.06 to 37.68 nm withthe increase of both thickness and annealing temperature. On the other hand, the two parameters dislocation density andstrain followed an opposite trend and decreased from 1.27 to 0.704 (1015 lines /m2) and from 1.29 × 10−3 to 0.961 × 10−3,respectively