Giant barrier layer capacitance effects in the lithium ion conducting material La0.67Li0.25Ti0.75Al0.25O3

García-Martín, Susana; Morata‐Orrantia, Ainhoa; Aguirre, M. H.; Alario-Franco, M.Á.

doi:10.1063/1.1852717

Cited by 30 publications

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“…25 Ti 0.75 Al 0.25 O 3 . [10] The chemical and physical properties of materials are intimately related to their crystal structure and microstructure. Therefore, the knowledge of the crystal structure of these oxides, in particular the location of the Li ions, is essential to understand their physicochemical behavior.…”

Section: Introductionmentioning

confidence: 99%

Beyond the Structure–Property Relationship Paradigm: Influence of the Crystal Structure and Microstructure on the Li⁺ Conductivity of La_2/3Li_xTi_1−xAl_xO₃ Oxides

García-Martín

Morata‐Orrantia

Alario-Franco

et al. 2007

Chemistry A European J

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The crystal structures of several oxides of the La(2/3)Li(x)Ti(1-x)Al(x)O(3) system have been studied by selected-area electron diffraction, high-resolution transmission electron microscopy, and powder neutron diffraction, and their lithium conductivity has been by complex impedance spectroscopy. The compounds have a perovskite-related structure with a unit cell radical2 a(p)x2 a(p)x radical2 a(p) (a(p)=perovskite lattice parameter) due to the tilting of the (Ti/Al)O(6) octahedra and the ordering of lanthanum and lithium ions and vacancies along the 2 a(p) axis. The Li(+) ions present a distorted square-planar coordination and are located in interstitial positions of the structure, which could explain the very high ionic conductivity of this type of material. The lithium conductivity depends on the oxide composition and its crystal microstructure, which varies with the thermal treatment of the sample. The microstructure of these titanates is complex due to formation of domains of ordering and other defects such as strains and compositional fluctuations.

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Section: Introductionmentioning

confidence: 99%

Beyond the Structure–Property Relationship Paradigm: Influence of the Crystal Structure and Microstructure on the Li⁺ Conductivity of La_2/3Li_xTi_1−xAl_xO₃ Oxides

García-Martín

Morata‐Orrantia

Alario-Franco

et al. 2007

Chemistry A European J

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“…Most of these materials are cubic and hexagonal perovskite oxide ceramics, including CaCu 3 Ti 4 O 12 (CCTO) [1][2][3][4][5][6][7][8], ACu 3 Ti 4 O 12 (A = La 2/3 , Bi 2/ 3 , Na 1/2 Bi 1/2 , etc.) [9][10][11], Ta-doped BaTi 0.85 Zr 0.15 O 3 [12], La 0.67 Li x Ti 1-x Al x O 3 (x = 0.2, 0.25) [13,14], Fe-based complex perovskites B(Fe 1/2 M 1/2 )O 3 (B = Ba, Sr, and Ca, M = Nb, Ta, and Sb) [15][16][17], and Ba 4 YMn 3 O 11.5 [18], with the exception of a non-perovskite Li and Ti doped NiO ceramics [19]. It could be observed that most materials with giant dielectric constant share common features, i.e.…”

Section: Introductionmentioning

confidence: 99%

Giant dielectric properties of nanocrystalline Pb1−xSnxF2 solid solutions

Ahmad

2014

J Mater Sci: Mater Electron

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Nanocrystalline Pb 1-x Sn x F 2 (x = 0.2, 0.3) solid solutions have been synthesized by mechanochemical milling at room temperature with grain size as small as 26 nm. These fluoride ion conducting materials exhibit giant values of the dielectric constant of e 0 [ 10 5 that is independent of temperature and frequency over wide ranges. The giant values of e 0 are suggested to be due to internal effects in the materials. The dielectric response has been analyzed by appropriate equivalent circuit representing the grain and internal effects in the materials. Interestingly, the dielectric constant of the current samples is found to be larger for the samples with smaller grain size, a behavior that is quite opposite to what usually observed in giant dielectric oxide materials, where e 0 is enhanced with substantial growth of the grain size. The possible origin of the giant dielectric constant is discussed in the present study.

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“…[1][2][3][4][5][6] A different explanation to the peculiar dielectric behavior of this material has been given by Sinclair and co-workers. 15 We have reported the dielectric behavior of the 16 This material has a perovskite-related structure and is a lithium ion conductor; in fact, it is the oxide with the highest ionic conductivity of the La 2/3 Li 3x Ti 1−x Al x O 3 family. The conducting phase has been related to the formation of Ti 3+ .…”

Section: Introductionmentioning

confidence: 99%

Influence of the crystal microstructure on the dielectric response of the La0.67Li0.2Ti0.8Al0.2O3

García-Martín

Morata‐Orrantia

Alario-Franco

2006

Journal of Applied Physics

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Articles you may be interested inThe sintering temperature effects on the electrical and dielectric properties of Li 0.05 Ti 0.02 Ni 0.93 O ceramics prepared by a direct thermal decomposition method Polycrystalline samples of La 0.67 Li 0.2 Ti 0.8 Al 0.2 with different crystal microstructures have similar general dielectric behavior. The materials show very high dielectric permittivity ͑Ј Ϸ 300 000͒ over relatively wide frequency and temperature ranges with no apparent dependence on the microstructure. The impedance spectroscopy study indicates that the origin of the high dielectric constant is a barrier layer capacitor effect due to depletion of Li ions at the grain boundaries of these Li-conducting materials. However, influence of the three dimensional microstructure domains on bulk properties such as electrical resistance and capacitance is observed.

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Giant barrier layer capacitance effects in the lithium ion conducting material La0.67Li0.25Ti0.75Al0.25O3

Abstract: Articles you may be interested inThe sintering temperature effects on the electrical and dielectric properties of Li 0.05 Ti 0.02 Ni 0.93 O ceramics prepared by a direct thermal decomposition method

Cited by 30 publications

References 13 publications

Beyond the Structure–Property Relationship Paradigm: Influence of the Crystal Structure and Microstructure on the Li⁺ Conductivity of La_2/3Li_xTi_1−xAl_xO₃ Oxides

Beyond the Structure–Property Relationship Paradigm: Influence of the Crystal Structure and Microstructure on the Li⁺ Conductivity of La_2/3Li_xTi_1−xAl_xO₃ Oxides

Giant dielectric properties of nanocrystalline Pb1−xSnxF2 solid solutions

Influence of the crystal microstructure on the dielectric response of the La0.67Li0.2Ti0.8Al0.2O3

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Giant barrier layer capacitance effects in the lithium ion conducting material La0.67Li0.25Ti0.75Al0.25O3

Abstract: Articles you may be interested inThe sintering temperature effects on the electrical and dielectric properties of Li 0.05 Ti 0.02 Ni 0.93 O ceramics prepared by a direct thermal decomposition method

Cited by 30 publications

References 13 publications

Beyond the Structure–Property Relationship Paradigm: Influence of the Crystal Structure and Microstructure on the Li+ Conductivity of La2/3LixTi1−xAlxO3 Oxides

Beyond the Structure–Property Relationship Paradigm: Influence of the Crystal Structure and Microstructure on the Li+ Conductivity of La2/3LixTi1−xAlxO3 Oxides

Giant dielectric properties of nanocrystalline Pb1−xSnxF2 solid solutions

Influence of the crystal microstructure on the dielectric response of the La0.67Li0.2Ti0.8Al0.2O3

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Beyond the Structure–Property Relationship Paradigm: Influence of the Crystal Structure and Microstructure on the Li⁺ Conductivity of La_2/3Li_xTi_1−xAl_xO₃ Oxides

Beyond the Structure–Property Relationship Paradigm: Influence of the Crystal Structure and Microstructure on the Li⁺ Conductivity of La_2/3Li_xTi_1−xAl_xO₃ Oxides