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Thermophysical Properties of Lithium Aluminum Germanium Phosphate with Different Compositions

Rohde, Magnus; Cui, Yuantao; Ziebert, Carlos; Seifert, Hans Jürgen

Abstract:
The NASICON system LAGP (Li$_{1+x}$Al$_{x}$Ge$_{2-x}$ (PO$_{4}$)$_{3}$ was studied, which is a candidate material for solid state electrolytes. LAGP substrates with different compositions (x = 0.3–0.7) were prepared using a melt quenching route with subsequent heat treatment. In order to develop a better understanding of the relationships between the structure and the ionic as well as the thermal conductivity, respectively, the samples were characterized by X-ray diffraction. The ionic conductivity was measured using impedance spectroscopy while the thermal diffusivity and the specific heat were determined by Laser Flash technique and differential scanning calorimetry, respectively. Additionally, thermal analysis was performed in order to evaluate the thermal stability a higher temperatures and, also to identify the optimum temperature range of the thermal post-processing. The measured values of the ionic conductivities were in the range of 10$^{-4}$Ω$^{-1}$·cm$^{-1}$ to 10$^{-3}$ Ω$^{-1}$·cm$^{-1}$ at room temperature, but exhibited an increasing behavior as a function of temperature reaching a level of the order 10$^{-2}$ Ω$^{-1}$· cm$^{-1}$ above 200 °C. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000105689
Veröffentlicht am 18.02.2020
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien - Angewandte Werkstoffphysik (IAM-AWP)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 03.2020
Sprache Englisch
Identifikator ISSN: 0195-928X, 1572-9567
KITopen-ID: 1000105689
HGF-Programm 37.01.02 (POF III, LK 01)
Components and Cells
Erschienen in International journal of thermophysics
Band 41
Heft 3
Seiten Art. Nr.: 31
Vorab online veröffentlicht am 30.01.2020
Schlagwörter Ionic conductivity, Solid electrolyte, Superionics, Thermal conductivity
Nachgewiesen in Web of Science
Scopus
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