Spark plasma versus conventional sintering in the electrical properties of Nasicon-type materials



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Pérez Estébanez, M. and Isasi Marín, Josefa and Rivera Calzada, Alberto Carlos and León Yebra, Carlos and Nygren, M. (2015) Spark plasma versus conventional sintering in the electrical properties of Nasicon-type materials. Journal of alloys and compounds, 651 . pp. 636-642. ISSN 0925-8388

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Li_(1+x)M_(x)Ti_(2−x)(PO_(4))_(3) powders with x = 0 and 0.3 and M = Al, Cr and Fe have been sintered by conventional sintering (CS) and Spark Plasma Sintering (SPS), and the electrical properties have been compared. The use of SPS allows preparing samples with higher density at lower temperature and shorter time than the CS, avoiding segregation of secondary phases and with reduced crystallite size. The introduction of aluminum, chromium and iron in the LiTi_(2)(PO_(4))_(3) (LTP) clearly enhances ionic conductivity even if the samples have similar densities. Despite the different level of density reached with CS and SPS, the activation energies of dc and grain boundary contributions are very similar and the differences in ionic conductivity are determined by pre-exponential factors. The samples produced by SPS showed a well-defined grain boundary meaning a more homogenous electrical contact.

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© 2016 Elsevier B.V. This research has been financed by the “Ministerio de Ciencia e Innovación” (MICINN, Spain) and by the “Fundación Neurociencias y Envejecimiento” (Spain) through grants MAT2010-18432 and 4153592, 4143942 respectively as well as by the MAT2013-40722-R project.

Uncontrolled Keywords:Conducting solid-electrolyte, Lithium secondary battery, Li-ion conductors, Glass-ceramics, Superionic conductivity, LiTi2(PO4)(3), Li2O-Al2O3-TiO2-P2O5, Dependence, Impedance, Chromium.
Subjects:Sciences > Physics > Electricity
Sciences > Physics > Electronics
ID Code:35284
Deposited On:02 Feb 2016 11:10
Last Modified:10 Dec 2018 14:57

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