Impedance spectroscopy of pellets made from yttria stabilized zirconia nanoparticles generated via CW and pulsed mode of laser vaporization method

Effect of Bismuth Oxide on the Microstructure and Electrical Conductivity of Yttria Stabilized Zirconia

“…The derived equivalent circuit diagram of the impedance curve is shown in the insert of Figure 8. The high frequency and low frequency semicircle of 2Bi-10YSZ sample shown in Figure 8 represent the grain resistance and grain boundary resistance [17,24,25], respectively. Due to the relaxation properties of different materials and the relatively high measurement temperature, the high-frequency semicircle of the 8YSZ sample represents its grain boundary resistance, and the grain resistance is calculated via the horizontal intercept of the high frequency impedance curve [16,25].…”

Yttria stabilized zirconia derived from metal–organic frameworks

“…20 The low activation energy in these samples showed that oxygen ion transport occurs through vacancies whose nearest neighbor is a Zr 4+ ion, meaning that tripole type vacancies do not contribute to conductivity. 21 Typically, tripole type defects are formed during the condensation process of sintering. However, in this work, we used green powder which was pressed into pellets under a pressure of 900 MPa for electric measurement, which enabled the porous structure of the sample to be maintained and the defect interactions to decrease.…”

X-ray absorption spectroscopy based investigation of local structure in yttria stabilized zirconia nanoparticles generated by laser evaporation method: Effect of pulsed vs CW mode of laser operation

“…Details of nanoparticle generation and characterization have been described elsewhere [28,29]. In short, nanoparticles of YSZ were generated by laser vaporization of pellets prepared by powder metallurgy route from powders of ZrO 2 and Y 2 O 3 .…”

“…We have earlier reported electrical impedance characterization of pellets made from nanoparticles generated by laser evaporation method [28,29]. Comparative studies were performed with respect to mode of particle generation and yttria concentration in laser generated YSZ nanoparticles.…”

“…Nanoparticles were generated under two conditions: (1) the concentration of yttria (10 mol%) in the irradiated pellets was constant but irradiation conditions were different, (2) the concentration of yttria (6, 10 and 16 mol%) in the irradiated pellets was different but irradiation conditions were same [29]. Under first condition nanoparticles were generated using pulsed mode and continuous (CW) mode of laser operation and it has been observed that ionic conductivity of pellet made from nanoparticles generated under pulsed mode of laser vaporization was two orders of magnitude higher than in pellets made from nanoparticles generated under CW mode of laser vaporization [28]. Sintering condition of all these samples was identical and therefore we concluded that the difference in ionic conductivity could be related to the defects in laser generated nanoparticles and sintering would not change the local structure in the interior of the particles.…”