Composition dependence of the dispersive nature of the ac conductivity in ionic conductors Gd2Ti2-yZryO7 and Li0.5-xNaxLa0.5TiO3

J. García-Barriocanal; K. J. Moreno; A. F. Fuentes; J. Santamaría; C. León

doi:10.1016/j.jnoncrysol.2006.04.028

Composition dependence of the dispersive nature of the ac conductivity in ionic conductors Gd₂Ti_2-yZr_yO₇ and Li_0.5-xNa_xLa_0.5TiO₃

J. García-Barriocanal, K. J. Moreno, A. F. Fuentes, J. Santamaría, C. León

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Abstract

We present Admittance Spectroscopy measurements on two different ionically conducting materials, Gd₂Ti_2-yZr_yO₇ and Li_0.5-xNa_xLa_0.5TiO₃. Electrical relaxation data have been found to be well described by stretched exponential functions of the form Φ(t) = exp(-(t/τ)^1-n). In Gd₂Ti_2-yZr_yO₇ the concentration of mobile ions in the whole series is very low, from 1% to 0.02 %, and we find that by strongly decreasing the density of mobile ions the value of the exponent n shows a significant decrease from 0.44 ± 0.01 to 0.16 ± 0.01. In Li_0.5-xNa_xLa_0.5TiO₃ we have investigated changes in ion dynamics when approaching the percolation threshold for lithium diffusion by increasing the number of immoble sodium ions, and found that the exponent n increases towards a value of 0.81 ± 0.01 as the mobility of lithium ions becomes more and more constrained close to the percolation threshold. Both results are discussed in terms of the importance of ion-ion correlations in the dispersive behavior of the electrical conductivity.

Original language	English (US)
Pages (from-to)	5141-5146
Number of pages	6
Journal	Journal of Non-Crystalline Solids
Volume	352
Issue number	42-49 SPEC. ISS.
DOIs	https://doi.org/10.1016/j.jnoncrysol.2006.04.028
State	Published - Nov 15 2006

Bibliographical note

Funding Information:
We thank K.L. Ngai for stimulating discussions. Authors from Universidad Complutense thank financial support from MCYT (MAT2004-3070-C05) and from CAM (GR/MAT/0250/2004). Authors from CINVESTAV thank CONACYT for financial support (Grant SEP-2003-C02-44075). K.J. Moreno thanks CINVESTAV for financial support during her stay at Universidad Complutense.

Keywords

Dielectric properties
Fast ion conduction
Relaxation, electric modulus

Publisher link

10.1016/j.jnoncrysol.2006.04.028

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@article{58797702a4934b9f8f59245007783653,

title = "Composition dependence of the dispersive nature of the ac conductivity in ionic conductors Gd2Ti2-yZryO7 and Li0.5-xNaxLa0.5TiO3",

abstract = "We present Admittance Spectroscopy measurements on two different ionically conducting materials, Gd2Ti2-yZryO7 and Li0.5-xNaxLa0.5TiO3. Electrical relaxation data have been found to be well described by stretched exponential functions of the form Φ(t) = exp(-(t/τ)1-n). In Gd2Ti2-yZryO7 the concentration of mobile ions in the whole series is very low, from 1% to 0.02 %, and we find that by strongly decreasing the density of mobile ions the value of the exponent n shows a significant decrease from 0.44 ± 0.01 to 0.16 ± 0.01. In Li0.5-xNaxLa0.5TiO3 we have investigated changes in ion dynamics when approaching the percolation threshold for lithium diffusion by increasing the number of immoble sodium ions, and found that the exponent n increases towards a value of 0.81 ± 0.01 as the mobility of lithium ions becomes more and more constrained close to the percolation threshold. Both results are discussed in terms of the importance of ion-ion correlations in the dispersive behavior of the electrical conductivity.",

keywords = "Dielectric properties, Fast ion conduction, Relaxation, electric modulus",

author = "J. Garc{\'i}a-Barriocanal and Moreno, {K. J.} and Fuentes, {A. F.} and J. Santamar{\'i}a and C. Le{\'o}n",

note = "Funding Information: We thank K.L. Ngai for stimulating discussions. Authors from Universidad Complutense thank financial support from MCYT (MAT2004-3070-C05) and from CAM (GR/MAT/0250/2004). Authors from CINVESTAV thank CONACYT for financial support (Grant SEP-2003-C02-44075). K.J. Moreno thanks CINVESTAV for financial support during her stay at Universidad Complutense.",

year = "2006",

month = nov,

day = "15",

doi = "10.1016/j.jnoncrysol.2006.04.028",

language = "English (US)",

volume = "352",

pages = "5141--5146",

journal = "Journal of Non-Crystalline Solids",

issn = "0022-3093",

publisher = "Elsevier",

number = "42-49 SPEC. ISS.",

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TY - JOUR

T1 - Composition dependence of the dispersive nature of the ac conductivity in ionic conductors Gd2Ti2-yZryO7 and Li0.5-xNaxLa0.5TiO3

AU - García-Barriocanal, J.

AU - Moreno, K. J.

AU - Fuentes, A. F.

AU - Santamaría, J.

AU - León, C.

N1 - Funding Information: We thank K.L. Ngai for stimulating discussions. Authors from Universidad Complutense thank financial support from MCYT (MAT2004-3070-C05) and from CAM (GR/MAT/0250/2004). Authors from CINVESTAV thank CONACYT for financial support (Grant SEP-2003-C02-44075). K.J. Moreno thanks CINVESTAV for financial support during her stay at Universidad Complutense.

PY - 2006/11/15

Y1 - 2006/11/15

N2 - We present Admittance Spectroscopy measurements on two different ionically conducting materials, Gd2Ti2-yZryO7 and Li0.5-xNaxLa0.5TiO3. Electrical relaxation data have been found to be well described by stretched exponential functions of the form Φ(t) = exp(-(t/τ)1-n). In Gd2Ti2-yZryO7 the concentration of mobile ions in the whole series is very low, from 1% to 0.02 %, and we find that by strongly decreasing the density of mobile ions the value of the exponent n shows a significant decrease from 0.44 ± 0.01 to 0.16 ± 0.01. In Li0.5-xNaxLa0.5TiO3 we have investigated changes in ion dynamics when approaching the percolation threshold for lithium diffusion by increasing the number of immoble sodium ions, and found that the exponent n increases towards a value of 0.81 ± 0.01 as the mobility of lithium ions becomes more and more constrained close to the percolation threshold. Both results are discussed in terms of the importance of ion-ion correlations in the dispersive behavior of the electrical conductivity.

AB - We present Admittance Spectroscopy measurements on two different ionically conducting materials, Gd2Ti2-yZryO7 and Li0.5-xNaxLa0.5TiO3. Electrical relaxation data have been found to be well described by stretched exponential functions of the form Φ(t) = exp(-(t/τ)1-n). In Gd2Ti2-yZryO7 the concentration of mobile ions in the whole series is very low, from 1% to 0.02 %, and we find that by strongly decreasing the density of mobile ions the value of the exponent n shows a significant decrease from 0.44 ± 0.01 to 0.16 ± 0.01. In Li0.5-xNaxLa0.5TiO3 we have investigated changes in ion dynamics when approaching the percolation threshold for lithium diffusion by increasing the number of immoble sodium ions, and found that the exponent n increases towards a value of 0.81 ± 0.01 as the mobility of lithium ions becomes more and more constrained close to the percolation threshold. Both results are discussed in terms of the importance of ion-ion correlations in the dispersive behavior of the electrical conductivity.

KW - Dielectric properties

KW - Fast ion conduction

KW - Relaxation, electric modulus

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DO - 10.1016/j.jnoncrysol.2006.04.028

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EP - 5146

JO - Journal of Non-Crystalline Solids

JF - Journal of Non-Crystalline Solids

IS - 42-49 SPEC. ISS.

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