Anomalous broad dielectric relaxation in Bi1.5Zn1.0Nb1.5O7 pyrochlore

Stanislav Kamba, Viktor Porokhonskyy, Alexej Pashkin, Viktor Bovtun, Jan Petzelt, Juan C. Nino, Susan E. Trolier-McKinstry, Michael T. Lanagan, Clive A. Randall

Research output: Contribution to journalArticle

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Abstract

The complex dielectric response of Bi1.5Zn1.0Nb1.5O7 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 ∼1011 Hz is almost temperature independent and its low-frequency end obeys the Arrhenius Law with an activation energy of ∼0.2 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 Zn2+ atoms and vacancies on Bi3+ 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.

Original languageEnglish (US)
Article number054106
Pages (from-to)541061-541068
Number of pages8
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume66
Issue number5
DOIs
StatePublished - Aug 1 2002

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Dielectric relaxation
Temperature
low frequencies
Atoms
Dielectric losses
dielectric loss
Vacancies
atoms
Infrared spectroscopy
Permittivity
Capacitance
Activation energy
frequency ranges
capacitance
infrared spectroscopy
pyrochlore
Spectroscopy
ceramics
permittivity
activation energy

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Kamba, Stanislav ; Porokhonskyy, Viktor ; Pashkin, Alexej ; Bovtun, Viktor ; Petzelt, Jan ; Nino, Juan C. ; Trolier-McKinstry, Susan E. ; Lanagan, Michael T. ; Randall, Clive A. / Anomalous broad dielectric relaxation in Bi1.5Zn1.0Nb1.5O7 pyrochlore. In: Physical Review B - Condensed Matter and Materials Physics. 2002 ; Vol. 66, No. 5. pp. 541061-541068.
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Anomalous broad dielectric relaxation in Bi1.5Zn1.0Nb1.5O7 pyrochlore. / Kamba, Stanislav; Porokhonskyy, Viktor; Pashkin, Alexej; Bovtun, Viktor; Petzelt, Jan; Nino, Juan C.; Trolier-McKinstry, Susan E.; Lanagan, Michael T.; Randall, Clive A.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 66, No. 5, 054106, 01.08.2002, p. 541061-541068.

Research output: Contribution to journalArticle

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T1 - Anomalous broad dielectric relaxation in Bi1.5Zn1.0Nb1.5O7 pyrochlore

AU - Kamba, Stanislav

AU - Porokhonskyy, Viktor

AU - Pashkin, Alexej

AU - Bovtun, Viktor

AU - Petzelt, Jan

AU - Nino, Juan C.

AU - Trolier-McKinstry, Susan E.

AU - Lanagan, Michael T.

AU - Randall, Clive A.

PY - 2002/8/1

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N2 - The complex dielectric response of Bi1.5Zn1.0Nb1.5O7 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 ∼1011 Hz is almost temperature independent and its low-frequency end obeys the Arrhenius Law with an activation energy of ∼0.2 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 Zn2+ atoms and vacancies on Bi3+ 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.

AB - The complex dielectric response of Bi1.5Zn1.0Nb1.5O7 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 ∼1011 Hz is almost temperature independent and its low-frequency end obeys the Arrhenius Law with an activation energy of ∼0.2 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 Zn2+ atoms and vacancies on Bi3+ 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.

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SN - 1098-0121

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Kamba S, Porokhonskyy V, Pashkin A, Bovtun V, Petzelt J, Nino JC et al. Anomalous broad dielectric relaxation in Bi1.5Zn1.0Nb1.5O7 pyrochlore. Physical Review B - Condensed Matter and Materials Physics. 2002 Aug 1;66(5):541061-541068. 054106. https://doi.org/10.1103/PhysRevB.66.054106