### Abstract

Various electrical and dielectric properties were measured on rutile-type compositions Fe_{1-x}Mn_{x}NbTiO_{6} (0 ≤ x ≤ 0.9) between ≈ 100 K and 750 K using impedance spectroscopy. DC conductivity σ_{DC} 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 E_{A} and σ_{DC}(300 K) between x = 0.1 and 0.2 with increase from E_{A} ≈ 0.3–0.6 eV, accompanied by a fall in σ_{DC}(300 K) from ≈10^{−4} to 10^{−8} Ω^{−1}cm^{−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 σ_{DC}. 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. ^{57}Fe Mössbauer parameters exhibit some irregularities between x = 0.05 and 0.2, ascribed predominantly to the influence of local distortions by Jahn-Teller active Mn^{3+} ions.

Original language | English (US) |
---|---|

Pages (from-to) | 343-351 |

Number of pages | 9 |

Journal | Journal of Physics and Chemistry of Solids |

Volume | 124 |

DOIs | |

State | Published - Jan 1 2019 |

Externally published | Yes |

### Fingerprint

### Keywords

- Dielectric capacitance
- Electrical conductivity
- Impedance spectroscopy
- Mössbauer spectroscopy
- Relaxor ferroelectrics

### Cite this

^{3+}ions on electrical and dielectric properties, thermopower and Mössbauer spectra of rutile-type Fe

_{1-x}Mn

_{x}NbTiO

_{6}(0 ≤ x ≤ 0.9).

*Journal of Physics and Chemistry of Solids*,

*124*, 343-351. https://doi.org/10.1016/j.jpcs.2018.09.021

**Influence of Jahn-Teller active Mn ^{3+} ions on electrical and dielectric properties, thermopower and Mössbauer spectra of rutile-type Fe_{1-x}Mn_{x}NbTiO_{6} (0 ≤ x ≤ 0.9).** / Günther, A.; Hochleitner, R.; Schmidbauer, E.; Schöttler-Himmel, A.; Volk, Michael W.

Research output: Contribution to journal › Article

^{3+}ions on electrical and dielectric properties, thermopower and Mössbauer spectra of rutile-type Fe

_{1-x}Mn

_{x}NbTiO

_{6}(0 ≤ x ≤ 0.9)'

*Journal of Physics and Chemistry of Solids*, vol. 124, pp. 343-351. https://doi.org/10.1016/j.jpcs.2018.09.021

^{3+}ions on electrical and dielectric properties, thermopower and Mössbauer spectra of rutile-type Fe

_{1-x}Mn

_{x}NbTiO

_{6}(0 ≤ x ≤ 0.9). Journal of Physics and Chemistry of Solids. 2019 Jan 1;124:343-351. https://doi.org/10.1016/j.jpcs.2018.09.021

}

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

JF - Journal of Physics and Chemistry of Solids

SN - 0022-3697

ER -