Abstract
Various electrical and dielectric properties were measured on rutile-type compositions Fe1-xMnxNbTiO6 (0 ≤ x ≤ 0.9) between ≈ 100 K and 750 K using impedance spectroscopy. DC conductivity σDC shows Arrhenius behavior for the bulk above room temperature (RT) for all x values. Starting from x = 0, there is a considerable change in activation energy EA and σDC(300 K) between x = 0.1 and 0.2 with increase from EA ≈ 0.3–0.6 eV, accompanied by a fall in σDC(300 K) from ≈10−4 to 10−8 Ω−1cm−1; for x > 0.2 no considerable further variation with rising x is established. For x ≤ 0.1, below RT Mott's variable range hopping T−1/4 law is obeyed for σDC. The known relaxor-type behavior of the dielectric constant ε′ for x = 0 with very high peaks at 500–600 K for low frequencies (163 Hz-6 kHz) changes with rising x to consecutively lower values in ε′ with disappearance of the peaks and with the largest values at the highest applied temperatures; the relaxor-type behavior can originate from a combination of bulk, grain boundary and sample-electrode effects. Below RT, a dramatic decrease in ε′ is noted for low x values, resulting finally at ≈ 100 K for compositions of any x in the bulk value of ε’ < 15. The thermopower above RT is negative, hence n-type conduction occurs and charge transport is attributed to small polaron hopping. 57Fe Mössbauer parameters exhibit some irregularities between x = 0.05 and 0.2, ascribed predominantly to the influence of local distortions by Jahn-Teller active Mn3+ ions.
| Language | English (US) |
|---|---|
| Pages | 343-351 |
| Number of pages | 9 |
| Journal | Journal of Physics and Chemistry of Solids |
| Volume | 124 |
| DOIs | |
| State | Published - Jan 1 2019 |
Fingerprint
Keywords
- Dielectric capacitance
- Electrical conductivity
- Impedance spectroscopy
- Mössbauer spectroscopy
- Relaxor ferroelectrics
Cite this
Influence of Jahn-Teller active Mn3+ ions on electrical and dielectric properties, thermopower and Mössbauer spectra of rutile-type Fe1-xMnxNbTiO6 (0 ≤ x ≤ 0.9). / Günther, A.; Hochleitner, R.; Schmidbauer, E.; Schöttler-Himmel, A.; Volk, Michael W.
In: Journal of Physics and Chemistry of Solids, Vol. 124, 01.01.2019, p. 343-351.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Influence of Jahn-Teller active Mn3+ ions on electrical and dielectric properties, thermopower and Mössbauer spectra of rutile-type Fe1-xMnxNbTiO6 (0 ≤ x ≤ 0.9)
AU - Günther, A.
AU - Hochleitner, R.
AU - Schmidbauer, E.
AU - Schöttler-Himmel, A.
AU - Volk, Michael W
PY - 2019/1/1
Y1 - 2019/1/1
N2 - Various electrical and dielectric properties were measured on rutile-type compositions Fe1-xMnxNbTiO6 (0 ≤ x ≤ 0.9) between ≈ 100 K and 750 K using impedance spectroscopy. DC conductivity σDC shows Arrhenius behavior for the bulk above room temperature (RT) for all x values. Starting from x = 0, there is a considerable change in activation energy EA and σDC(300 K) between x = 0.1 and 0.2 with increase from EA ≈ 0.3–0.6 eV, accompanied by a fall in σDC(300 K) from ≈10−4 to 10−8 Ω−1cm−1; for x > 0.2 no considerable further variation with rising x is established. For x ≤ 0.1, below RT Mott's variable range hopping T−1/4 law is obeyed for σDC. The known relaxor-type behavior of the dielectric constant ε′ for x = 0 with very high peaks at 500–600 K for low frequencies (163 Hz-6 kHz) changes with rising x to consecutively lower values in ε′ with disappearance of the peaks and with the largest values at the highest applied temperatures; the relaxor-type behavior can originate from a combination of bulk, grain boundary and sample-electrode effects. Below RT, a dramatic decrease in ε′ is noted for low x values, resulting finally at ≈ 100 K for compositions of any x in the bulk value of ε’ < 15. The thermopower above RT is negative, hence n-type conduction occurs and charge transport is attributed to small polaron hopping. 57Fe Mössbauer parameters exhibit some irregularities between x = 0.05 and 0.2, ascribed predominantly to the influence of local distortions by Jahn-Teller active Mn3+ ions.
AB - Various electrical and dielectric properties were measured on rutile-type compositions Fe1-xMnxNbTiO6 (0 ≤ x ≤ 0.9) between ≈ 100 K and 750 K using impedance spectroscopy. DC conductivity σDC shows Arrhenius behavior for the bulk above room temperature (RT) for all x values. Starting from x = 0, there is a considerable change in activation energy EA and σDC(300 K) between x = 0.1 and 0.2 with increase from EA ≈ 0.3–0.6 eV, accompanied by a fall in σDC(300 K) from ≈10−4 to 10−8 Ω−1cm−1; for x > 0.2 no considerable further variation with rising x is established. For x ≤ 0.1, below RT Mott's variable range hopping T−1/4 law is obeyed for σDC. The known relaxor-type behavior of the dielectric constant ε′ for x = 0 with very high peaks at 500–600 K for low frequencies (163 Hz-6 kHz) changes with rising x to consecutively lower values in ε′ with disappearance of the peaks and with the largest values at the highest applied temperatures; the relaxor-type behavior can originate from a combination of bulk, grain boundary and sample-electrode effects. Below RT, a dramatic decrease in ε′ is noted for low x values, resulting finally at ≈ 100 K for compositions of any x in the bulk value of ε’ < 15. The thermopower above RT is negative, hence n-type conduction occurs and charge transport is attributed to small polaron hopping. 57Fe Mössbauer parameters exhibit some irregularities between x = 0.05 and 0.2, ascribed predominantly to the influence of local distortions by Jahn-Teller active Mn3+ ions.
KW - Dielectric capacitance
KW - Electrical conductivity
KW - Impedance spectroscopy
KW - Mössbauer spectroscopy
KW - Relaxor ferroelectrics
UR - http://www.scopus.com/inward/record.url?scp=85054428230&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85054428230&partnerID=8YFLogxK
U2 - 10.1016/j.jpcs.2018.09.021
DO - 10.1016/j.jpcs.2018.09.021
M3 - Article
VL - 124
SP - 343
EP - 351
JO - Journal of Physics and Chemistry of Solids
T2 - Journal of Physics and Chemistry of Solids
JF - Journal of Physics and Chemistry of Solids
SN - 0022-3697
ER -