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• W1673868478 abstract "The complex dielectric response of ${mathrm{Bi}}_{1.5}{mathrm{Zn}}_{1.0}{mathrm{Nb}}_{1.5}{mathrm{O}}_{7}$ cubic pyrochlore ceramics was investigated between 100 Hz and 100 THz by a combination of low-frequency capacitance bridges, a high-frequency coaxial technique, time domain transmission THz spectroscopy, and infrared spectroscopy. The data obtained between 10 K and 400 K revealed glasslike dielectric behavior: dielectric relaxation is observed over a wide frequency and temperature range, and the dielectric permittivity and loss maxima shift to higher temperature values by almost 200 K with increasing measuring frequency. The distribution of relaxation frequencies broadens on cooling and can be described by a uniform distribution. The high-frequency end of the distribution at $ensuremath{sim}{10}^{11} mathrm{Hz}$ is almost temperature independent and its low-frequency end obeys the Arrhenius Law with an activation energy of $ensuremath{sim}0.2 mathrm{eV}.$ The relaxation is assigned to the local hopping of atoms in the A and O' positions of the pyrochlore structure among several local potential minima. The barrier height for hopping is distributed between 0 and 0.2 eV. Such an anomalously broad distribution may have its origin in the inhomogeneous distribution of ${mathrm{Zn}}^{2+}$ atoms and vacancies on ${mathrm{Bi}}^{3+}$ sites, which gives rise to random fields and nonperiodic interatomic potential. Frequency independent dielectric losses $(1/f$ noise) are observed at low temperatures, which seems to be a universal behavior of disordered systems at low temperatures." @default.
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• W1673868478 date "2002-08-19" @default.
• W1673868478 modified "2023-09-25" @default.
• W1673868478 title "Anomalous broad dielectric relaxation in<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Bi</mml:mi></mml:mrow><mml:mrow><mml:mn>1.5</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Zn</mml:mi></mml:mrow><mml:mrow><mml:mn>1.0</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Nb</mml:mi></mml:mrow><mml:mrow><mml:…" @default.
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• W1673868478 doi "https://doi.org/10.1103/physrevb.66.054106" @default.
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