ac impedance analysis of a Ni-Nb-Zr-H glassy alloy with femtofarad capacitance tunnels

Fukuhara, M.; Seto, M.; Inoue, A.
January 2010
Applied Physics Letters;1/25/2010, Vol. 96 Issue 4, p043103
Academic Journal
A Nyquist diagram of a (Ni0.36Nb0.24Zr0.40)90H10 glassy alloy shows a semitrue circle, indicating that it is a conducting material with a total capacitance of 17.8 μF. The Bode plots showing the dependencies of its real and imaginary impedances, and phase on frequency suggest a simpler equivalent circuit having a resistor in parallel with a capacitor. Dividing the total capacitance (17.8 μF) by the capacitance of a single tunnel (0.9 fF), we deduced that this material has a high number of dielectric tunnels, which can be regarded as regular prisms separated from the electric-conducting distorted icosahedral Zr5Ni5Nb3 clusters by an average of 0.225 nm.


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