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Abstract  

The elaboration of Na+ super-ionic conductor (NaSICON) ceramics is studied in this work. These solid electrolytes can be used as sensor for detection of polluted gases in air. Two sorts of ceramics with different chemical compositions are synthesised by soft chemistry route: a zirconium-based NaSICON and a hafnium-based NaSICON. DTA-TG and temperature depending X-ray diffractometry were used to follow the thermal decomposition of the precursor phases. The electrical properties of these ceramic sodium ionic conductors are investigated by complex impedance spectroscopy (CIS). The substitution of the zirconium by the hafnium increases the ceramic conductivity and decreases the activation energy E a (from 0.29 to 0.12 eV).

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Journal of Thermal Analysis and Calorimetry
Authors: R. Sridarane, G. Raje, D. Shanmukaraj, B. Kalaiselvi, M. Santhi, S. Subramanian, S. Mohan, B. Palanivel, and R. Murugan

Abstract  

The understanding of molecular level structural information of phosphate glasses is very much essential. The unique microwave-absorbing ability of NaH2PO4·2H2O was found to be very useful for preparing crystal and glassy sodium super ionic conductors (Nasicon's) as a component of batch mixtures. In this work NaPO3 glass was prepared by both conventional melt quench and microwave heating from NaH2PO4·2H2O as a starting material. The structure of NaPO3 glass and their structural evolution upon heating through glass transition were probed by combination of complementary techniques like differential scanning calorimetry (DSC), powder X-ray diffraction (PXRD), Fourier transform infrared (FT-IR) and thermo-Raman spectroscopy.

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Introduction δ-Bi 2 O 3 is the best ionic conductor in intermediate temperature range from 700 to 800 °C. Many attempts have been made to synthesize good ionic conductor which has better stability and ionic conductivity

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support for the fuel cell and simultaneously acts as an O 2− ionic conductor. The anode support must have high degree of porosity (around 40–60%) to supply fuel and remove reaction products. Some authors proposed adding pore-forming particles, such as

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. 9. Mroczkowska , M , Czeppe , T , Nowinski , JL , Garbarczyk , JE , Wasiucionek , M 2008 DSC and XRD studies on crystallization kinetics in AgI rich glassy and glass crystalline ionic conductors of the AgI–Ag 2 O

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. Avagadro , A , Aldrovandi , S , Carini , G , Siri , A 1989 Specific heat and thermal conductivity of ionic conductors and chalcogenide glasses at low temperature . Philos Mag 59 : 33 – 42 10

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such as capacitors or microbatteries where the lamellar compounds are used as solid state ionic conductors. Semiconductors with such novel characteristics are suitable for sensors of small particles and ionizing radiation [ 17 ]. Moreover, the formation

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Reaction Kinetics, Mechanisms and Catalysis
Authors: Viorel Chihaia, Karl Sohlberg, M. Scurtu, C. Hornoiu, M. Caldararu, C. Munteanu, G. Postole, N. I. Ionescu, T. Yuzhakova, and A. Redey

.C. impedance of powdered and sintered solid ionic conductors . J Electroanal Chem Interfacial Electrochem 53 3 389 – 405 10.1016/s0022-0728(74)80077-x . 8. Borisevich , A , Sohlberg , K

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