Sintering behavior, ac conductivity and dielectric relaxation of Li 1.3 Ti 1.7 Al 0.3 (PO 4 ) 3 NASICON compound

Zangina, Tasiu; Hassan, Jumiah; Матори, Хамирул Амин; Azis, Raba’ah Syahidah; Ahmadu, Umaru; See, Alex

doi:10.1016/j.rinp.2016.10.003

Cited by 53 publications

(24 citation statements)

References 29 publications

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“…The increase of r ac with temperature is attributed to the impurities, which locate at the grain boundaries. Moreover, the increase may be due to thermally activated charge carrier mobility [32][33][34][35][36][37].…”

Section: Complex Electrical Conductivitymentioning

confidence: 99%

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Complex dielectric permittivity, electric modulus and electrical conductivity analysis of Au/Si3N4/p-GaAs (MOS) capacitor

Türkay

Tataroğlu

2021

J Mater Sci: Mater Electron

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RF magnetron sputtering was used to grow silicon nitride (Si3N4) thin film on GaAs substrate to form metal–oxide–semiconductor (MOS) capacitor. Complex dielectric permittivity (ε*), complex electric modulus (M*) and complex electrical conductivity (σ*) of the prepared Au/Si3N4/p-GaAs (MOS) capacitor were studied in detail. These parameters were calculated using admittance measurements performed in the range of 150 K-350 K and 50 kHz-1 MHz. It is found that the dielectric constant (ε′) and dielectric loss (ε″) value decrease with increasing frequency. However, as the temperature increases, the ε′ and ε″ increased. Ac conductivity (σac) was increased with increasing both temperature and frequency. The activation energy (Ea) was determined by Arrhenius equation. Besides, the frequency dependence of σac was analyzed by Jonscher’s universal power law (σac = Aωs). Thus, the value of the frequency exponent (s) were determined.

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Section: Complex Electrical Conductivitymentioning

confidence: 99%

“…The temperature dependence of ac conductivity can be described by Arrhenius equation given as follows [35][36][37][38][39][40][41],…”

Section: Complex Electrical Conductivitymentioning

confidence: 99%

Complex dielectric permittivity, electric modulus and electrical conductivity analysis of Au/Si3N4/p-GaAs (MOS) capacitor

Türkay

Tataroğlu

2021

J Mater Sci: Mater Electron

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“…Normally, the AC conductivity decreases as frequency decreases, and finally reaches a plateau at low frequencies. This plateau can be considered as the DC conductivity [30]. At room temperature, no such plateau is observed.…”

Section: Piezoelectric Charge Constantmentioning

confidence: 95%

The effect of the intrinsic electrical matrix conductivity on the piezoelectric charge constant of piezoelectric composites

Stuber

Mahon

Zwaag

et al. 2019

Mater. Res. Express

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Polymer-piezoceramic composites have drawn a lot of attention for sensor and energy harvesting applications. Poling such materials can be difficult due to the electric field getting mostly distributed over the low dielectric constant matrix. During this process, the electrical matrix conductivity plays a vital role. This work shows how two different polymer materials, loaded with various piezoelectric ceramic fillers, have very different poling efficiencies simply due to their intrinsic matrix conductivity. It is shown how temperature increases the matrix conductivity, and hence, increases the piezoelectric charge constant of the composites. By choosing the proper matrix material under the proper conditions, piezoelectric composites can be poled at electric fields as low as 2 kV mm −1 , which is identical to that of bulk ceramic fillers. In addition, the matrix conductivity can be altered by aging the composites in a high humidity atmosphere, which can increase the piezoelectric charge constant in similar fashion. This is a simple method to increase the matrix conductivity, and hence the piezoelectric charge constant, without the need to add any conductive fillers into the composites, which increase complexity, and leads to an increased dielectric losses.

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“…Powders as received were pressed into pellets to 0.75GPa prior to TGA analysis. All powders showed loss of weight due to increase of temperature, possibly due to retained water [60][61][62] , trapped gases 25 , decomposition 63 , or removal of synthesis residuals 62 . This alone could change the outcome for powders that were annealed then pressed compared to powders that were pressed, and then annealed because these contaminants could be reintroduced when pelletizing annealed powder.…”

Section: Tga Analysismentioning

confidence: 99%

Pressure Induced Changes in Grain Boundary Conditions of Lithium Conducting Ceramics Characterized by Impedance Spectroscopy

Ostrander

Torres

Vullum-Breuer

et al. 2021

Preprint

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Solid state batteries, particularly for lithium ion based architecture have been the focus of development for over 20 years and are receiving even more attention today. Utilizing impedance spectroscopy (IS) measurements we investigate the response of conductivity versus incremental pressure increase by a piston-cylinder-type high pressure cell up to 1 GPa for some lithium conducting ceramics: LATP (Li1.3Al0.3Ti1.7(PO4)3), LLTO (Li5La3Ta2O12), LLT (Li0.33La0.55TiO3), LAGP (Li1.5Al0.5Ge1.5P3O12) and LLZO (Li7La3Zr2O12) for non-annealed and annealed samples.Isothermal, incremental pressure increase of powders allows for an in situ observation of the transition state conditions of poorly consolidated ceramic powders and the effects on grain boundary conditions prior to sintering. Specific conductance (σb) increased by several orders of magnitude in some samples, approaching 10-3 S∙cm-1, yet decreased in other samples. The affect of grain boundaries and affects of bulk capacitance as the sample dimensions are altered due to pressure, are attributed to some of this behavior and will be discussed. The understanding of some of these fundamental processes may be valuable in facilitating these and similar ceramics for use in commercial solid state battery systems.

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Sintering behavior, ac conductivity and dielectric relaxation of Li 1.3 Ti 1.7 Al 0.3 (PO 4 ) 3 NASICON compound

Cited by 53 publications

References 29 publications

Complex dielectric permittivity, electric modulus and electrical conductivity analysis of Au/Si3N4/p-GaAs (MOS) capacitor

Complex dielectric permittivity, electric modulus and electrical conductivity analysis of Au/Si3N4/p-GaAs (MOS) capacitor

The effect of the intrinsic electrical matrix conductivity on the piezoelectric charge constant of piezoelectric composites

Pressure Induced Changes in Grain Boundary Conditions of Lithium Conducting Ceramics Characterized by Impedance Spectroscopy

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