Impedance spectroscopy and conduction mechanism of LiAlP2O7 material

Taher, Y. Ben; Oueslati, A.; Khirouni, K.; Gargouri, M.

doi:10.1016/j.materresbull.2016.02.033

Cited by 39 publications

(14 citation statements)

References 38 publications

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“…The AC conductivity in the CBH model is articulated as follows: 60 where N is a symbol of the concentration of pair sites and R ω defines the hopping distance, which considered by: 61 …”

Section: Resultsmentioning

confidence: 99%

Structural and morphological studies, and temperature/frequency dependence of electrical conductivity of Ba_0.97La_0.02Ti_1−xNb_4x/5O₃ perovskite ceramics

et al. 2021

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“…The AC conductivity in the CBH model is articulated as follows: 60 where N is a symbol of the concentration of pair sites and R ω defines the hopping distance, which considered by: 61 …”

Section: Resultsmentioning

confidence: 99%

Structural and morphological studies, and temperature/frequency dependence of electrical conductivity of Ba_0.97La_0.02Ti_1−xNb_4x/5O₃ perovskite ceramics

et al. 2021

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“…Maybe the LiAlP 2 O 7 secondary phase, which is not observed in the RAMAN spectroscopy, could be accumulated at the grain boundaries. The conductivity of this phase is 8.8 × 10 −6 Ω −1 •cm −1 at 330 • C, just three orders of magnitude lower than the "bulk" one [37]. With this conductivity, the distribution of this phase at the grain boundaries cannot explain the increase in the blocking behavior.…”

Section: Discussionmentioning

confidence: 85%

“…From the compositional map of the LATPT1 thick-film sample (Figure 4c), an even distribution of this and the other secondary phases is observed. The Raman spectrum of the unknown phase does not match with that of the LiAlP 2 O 7 one (the main Raman bands of this phase are around 669 nm −1 , and 713 nm −1 , because of the υ P-O-P and vs P-O-P modes) [37]. This secondary phase can be sub-micrometer in size, and thus out of the confocal Raman sensitivity.…”

Section: Discussionmentioning

confidence: 91%

Preparation and Characterization of Large Area Li-NASICON Electrolyte Thick Films

et al. 2019

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The preparation of solid electrolyte ceramic membranes is the object of intense study for its fundamental parts in the development of all solid-state batteries and improved battery separators. In this work, the procurement of large area solid electrolyte ceramic thick film membranes of the Li-NASICON Li1.3Al0.3Ti1.7(PO4)3 (LATP) composition is attempted. Through the use of LATP powders from a sol–gel reaction, a slurry is formulated and tape casted. The green tapes are sintered using two sintering times. In both cases, ceramic thick films of a 5.5 × 5.5 cm2 area and 250 µm average thickness were obtained. The characterization indicated almost pure phase samples with a bi-modal microstructure composed of large and smaller grains, being larger for longer sintering time. The samples are porous and brittle, presenting very high “bulk” conductivity but lower total direct current (DC) one, as compared with the commercial Li-NASICON (OHARA) thick films with a similar area. The larger the grains, the poorer the total conductivity and the mechanical properties of the thick-films. The formation of poorly adhering grain boundaries as the grain size grows is responsible for the worsened properties. A better control of the microstructure is mandatory.

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“…[49] In addition, with the increase in frequency and the low DC bias voltage, the values of M′ augmented and demonstrated a dispersion tending towards M∞ (the asymptotic value of M′ at higher frequencies). At lower value of frequencies, M′ was very low (very close to zero) at lower frequencies, [50] and tended to increase with increasing frequency and DC bias voltage. By increasing the DC bias voltage as well as the frequency, this variation was indicated as continuous dispersion.…”

Section: 2electrical Modulus Analysismentioning

confidence: 91%

DC-Bias Dependent Impedance and UV-Vis Diffuse Reflectance Spectroscopy of The Un-Doped and Nb-Doped Ba0.97La0.02TiO3 Ceramics

Jebli

Hamadoui

rayssi

et al. 2021

Preprint

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This report typically discusses the Voltage-Stability (V-S) of the electrical properties of a new perovskite oxide, Ba0.97La0.02Ti1-xNb4x/5O3 (noted BLT, BLT0.9Nb0.08) ceramics which have been meticulously studied. The ceramics typically exhibited a low rise in the real and imaginary parts of the complex impedance on the application of small field levels (up to 5 V). These accurate data, at a low voltage threshold, properly designate a hole-generation process which becomes active. These values considered using AC impedance spectroscopy, nonetheless, were relatively decreased with increasing Nb concentration, as well as increased by this application of a DC bias. For each sample, the complex impedance plot displayed a single impedance semicircle, identified over the high and low frequencies. The equivalent circuit configuration was typically fitted using the Electrochemical Impedance Spectroscopy (EIS) spectra analyzer. Importantly, the electrical properties of our both compounds deduced from the complex electric modulus show a conduction process due to the short-range mobility of charge carriers. An excellent addition of Niobium to some considerable extent can inhibit the grain growth. Conspicuously, the substitution of Nb5+ ions for Ti4+ on B sites leads to the noticeable increase of a band gap. These findings supplied critical insights into the electric mechanisms in BT-based ceramics.

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Impedance spectroscopy and conduction mechanism of LiAlP2O7 material

Cited by 39 publications

References 38 publications

Structural and morphological studies, and temperature/frequency dependence of electrical conductivity of Ba_0.97La_0.02Ti_1−xNb_4x/5O₃ perovskite ceramics

Structural and morphological studies, and temperature/frequency dependence of electrical conductivity of Ba_0.97La_0.02Ti_1−xNb_4x/5O₃ perovskite ceramics

Preparation and Characterization of Large Area Li-NASICON Electrolyte Thick Films

DC-Bias Dependent Impedance and UV-Vis Diffuse Reflectance Spectroscopy of The Un-Doped and Nb-Doped Ba0.97La0.02TiO3 Ceramics

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Impedance spectroscopy and conduction mechanism of LiAlP2O7 material

Cited by 39 publications

References 38 publications

Structural and morphological studies, and temperature/frequency dependence of electrical conductivity of Ba0.97La0.02Ti1−xNb4x/5O3 perovskite ceramics

Structural and morphological studies, and temperature/frequency dependence of electrical conductivity of Ba0.97La0.02Ti1−xNb4x/5O3 perovskite ceramics

Preparation and Characterization of Large Area Li-NASICON Electrolyte Thick Films

DC-Bias Dependent Impedance and UV-Vis Diffuse Reflectance Spectroscopy of The Un-Doped and Nb-Doped Ba0.97La0.02TiO3 Ceramics

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Structural and morphological studies, and temperature/frequency dependence of electrical conductivity of Ba_0.97La_0.02Ti_1−xNb_4x/5O₃ perovskite ceramics

Structural and morphological studies, and temperature/frequency dependence of electrical conductivity of Ba_0.97La_0.02Ti_1−xNb_4x/5O₃ perovskite ceramics