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

M. Fukuhara; M. Seto; A. Inoue

doi:10.1063/1.3294294

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

M. Fukuhara, M. Seto, A. Inoue

New Industry Creation Hatchery Center (NICHe)

Research output: Contribution to journal › Article › peer-review

28 Citations (Scopus)

Abstract

A Nyquist diagram of a (Ni_0.36Nb_0.24Zr _0.40)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.

Original language	English
Article number	043103
Journal	Applied Physics Letters
Volume	96
Issue number	4
DOIs	https://doi.org/10.1063/1.3294294
Publication status	Published - 2010 Feb 8

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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abstract = "A Nyquist diagram of a (Ni0.36Nb0.24Zr 0.40)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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N2 - A Nyquist diagram of a (Ni0.36Nb0.24Zr 0.40)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.

AB - A Nyquist diagram of a (Ni0.36Nb0.24Zr 0.40)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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