We have undoped, 1,2 ,3,4 and 5% Mg doped Ceria nanostructures. in its dielectric results (using LCR meter), the AC conductivity is nearly constant at low frequencies and then increases above a certain characteristic point with increase in frequency.
The AC measurements were carried out using LCR meter at room temperature in the frequency range of 0 kHz to 5MHz. The dielectric constant (ε’) was calculated from the equation.
ε' = (t×Cp) / (A×εo)
Where t is thickness of the pellets, Cp is the equivalent parallel capacitance obtained experimentally, A is the area of the pellets and εo is permittivity of vacuum. The dielectric loss (ε”) was calculated from the multiplication of ε_ with the dissipation factor D obtained experimentally. Finally, the AC conductivity was calculated from the equation
σac = 2πfεoε_tanδ, where tanδ = ε”/ ε’
How does AC conductivity of CeO2 nanostructures increase with increasing Mg doping concentration levels. Can anybody please answer with references?
The ionic conductivity of an electrolyte strongly depends on properties of dopant, namely, concentration, ionic radius and formal charge. The concept suggests that ionic conductivity could be enhanced by a decrease of ionic radius mismatch.
read more on : Journal of Asian ceramics ; Volume 2, Issue 2, June 2014, Pages 117–122
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