Effect of doping with Co2O3, TiO2, Fe2O3, and Mn2O3 on the properties of Ce0.8Gd0.2O2−δ

Inorganic Materials (Impact Factor: 0.38). 06/2007; 43(7):735-742. DOI: 10.1134/S0020168507070126

ABSTRACT The effects of Co, Fe, Mn, and Ti oxide additions on the sinterability and crystal-chemical, thermal, and electrical properties
of Ce0.8Gd0.2O2−δ have been studied. The results indicate that these oxides enhance the sinterability of the mixed oxide, regardless of whether
they were introduced before or after synthesis. The most effective sintering aid is Co2O3. The lattice parameters of Ce0.8Gd0.2O2−δ samples containing different metal oxide additions (1 mol %) are refined in space group Fm3m. The temperature-dependent thermal expansion data are used to determine the linear thermal expansion coefficients of the
samples. Manganese oxide additions reduce the electrical conductivity of Ce0.8Gd0.2O2−δ, whereas the other dopants increase it in the order Ti < Fe < Co. The activation energy for conduction increases in the order
Co < Ti < Fe < Mn.

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    ABSTRACT: In this paper, a novel hybrid fuzzy/PI controller for an induction motor drive is proposed. The major features of field-oriented control are exploited in the design of the scalar controller. A fuzzy logic slip-frequency controller operates together with a proportional-integral (PI) current controller to yield the desired values of slip-frequency and stator current during the acceleration/deceleration stage and the final steady-state stage. Detailed formulation of the fuzzy sets, the rule base, and the fuzzy inference of the slip frequency controller are presented. Simulation studies on a 150 W induction motor using Matlab/Simulink and hardware implementation based on an ADMC331 DSP board are performed. The simulation and experimental results indicate that the performance of the two-stage controller is comparable with that obtained using field-oriented control
    Electric Machines and Drives Conference, 2001. IEMDC 2001. IEEE International; 02/2001


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