NASICON electrode for detecting sodium ions

Leonhard, Victoria; Erdmann, Helmut; Ilgenstein, M.

doi:10.1016/0925-4005(93)00984-7

Cited by 16 publications

(9 citation statements)

References 5 publications

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“…As early as 1988 [24], ionic conductive polymers based on poly(ethylene)oxide (PEO) have been proposed to replace the internal liquid. Leonhard et al [25] have used NaxWO4 as the internal reference system of NASICON based Na + ISE. Thick film sensors prepared by the screen printing technique were also tested [26,31].…”

Section: Kinetics Study Of the Nasicon/solution Interfacementioning

confidence: 99%

NASICON type ionic conductors for alkali ion sensing

Siebert

Fabry

1999

Ionics

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Abstract. NASICON type ionic conductors can be used as the sensitive membrane of alkali ion sensors. The main advantages compared to the classical glass electrodes are the better selectivity and lower impedance. The mechanism of response of this type of ionic sensors is presented. The sensitivity results from a direct ionic exchange between the ceramic electrolyte and the solution which has been characterized by impedance spectroscopy. The origin of the selectivity in the NASICON framework is discussed in terms of structural and ionic exchange properties. The performance characteristics of sodium and lithium ion sensing devices are presented. Examples of biomedical applications such as the measurement of sodium concentration in the crevicular fluid and the determination of lithium in artificial serum are described.

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Section: Kinetics Study Of the Nasicon/solution Interfacementioning

confidence: 99%

NASICON type ionic conductors for alkali ion sensing

Siebert

Fabry

1999

Ionics

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“…Dense ceramic samples of Na 0.8 2 . Note that, in order to avoid Na 2 O volatilization, the temperature and the time of sintering were chosen minimum necessary to obtain homogeneous dense ceramics.…”

Section: Methodsmentioning

confidence: 99%

“…A similar behavior is characteristic of Na 0.8 Fe 0.8 Ti 0.2 O 2 where no hydrated phase is formed, but the XRD pattern shows the peaks of Na 2 CO 3 ּH 2 O marked in Fig.5 by triangles. The presence of sodium carbonate could be ascribed either to increasing sodium deficiency or to a partial ionic exchange followed by reaction with atmospheric CO 2 (Fig. 5).…”

Section: Conductivity In H 2 O-containing Atmospheresmentioning

confidence: 99%

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Síntesis y caracterización del conductor catiónico de sodio Nax(MyL1-y)O2 (M = Ni2+, Fe3+; L = Ti4+, Sb5+)

Smirnova¹,

Хартон²,

Marques³

2004

Bol. Soc. Esp. Ceram. Vidr.

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The Na + -conducting ceramics of layered Na 0.8 Ni 0.4 Ti 0.6 O 2 , Na 0.8 Fe 0.8 Ti 0.2 O 2 , Na 0.8 Ni 0.6 Sb 0.4 O 2 (structural type O3) and Na 0.68 Ni 0.34 Ti 0.66 O 2 (P2 type) with density higher than 91% were prepared via the standard solid-state synthesis route and characterized by the impedance spectroscopy, thermal analysis, scanning electron microscopy, structure refinement using X-ray powder diffraction data, measurements of Na + concentration cell e.m.f., and dilatometry. The conductivity of antimonate Na 0.8 Ni 0.6 Sb 0.4 O 2 , synthesized first time, was found lower than that of isostructural Na 0.8 Ni 0.4 Ti 0.6 O 2 due to larger ion jump distance between Na + sites. At temperatures above 420 K, transport properties of sodium cationconducting materials are essentially independent of partial water vapor pressure. In the low-temperature range, the conductivity reversibly increases with water vapor pressure varied in the range from approximately 0 (dry air) up to 0.46 atm. The sensitivity to air humidity is influenced by the ceramic microstructure, being favored by increasing boundary area. The average thermal expansion coefficients of layered materials at 300-1173 K are in the range (13.7-16.0)×10 (tipo P2) con densidad mayor del 91%. Las vía de preparación fu la ruta de estandard de síntesis en estado sólido. Las composiciones se caracterizaron mediante espectroscopía de impedancia, análisis térmico, microscopía electrónica de barrido, refinamiento de la estructura usando datos de difracción de rayos X en polvo, medidas de concentración de Na + , f.e.m. de la célula y dilatometría. La conductividad del antimoniate, sintetizado por primera vez, Na 0.8 Ni 0.6 Sb 0.4 O 2 , era menor que la del compuesto isoestructural Na 0.8 Ni 0.4 Ti 0.6 O 2 debido a la mayor distancia de salto iónico entre las posiciones de Na + . A temperaturas por encima de 420 K, las propiedades de transporte de los materiales conductores que contienen cations sodio son esencialmente independientes de la presión parcial de vapor de agua. En el intervalo de baja temperatura, la conductividad aumenta reversiblemente con la presión de vapor de agua variando en un intervalo de aproximadamente 0 (aire seco) hasta 0.46 atm. La sensibilidad a la humedad del aire está influída por la microestructura de la cerámica, estando favorecida al aumentar el área de borde. Los coeficientes de dilatación térmica medios de los materiales laminares entre 300 y 1173 K están en el intervalo (13.7-16.0)×10 -6 K -1 .Palabras clave: conductor con cationes sodio, espectroscopia de impedancia, humedad del aire, dilatación térmica, microestructura cerámica.

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“…Ενδιαφέρουσες μετατροπές έχουν γίνει με σκοπό την βελτίωση των χαρακτηριστικών του, μια από τις οποίες προτείνεται στην αναφορά [87]. Ενδιαφέρον παρουσιάζουν οι στερεοί ηλεκτρολύτες όπως οι Zr0 2 [87], NASICON [88][89], οργανικοί ηλεκτρολύτες [90], λόγω της απλής κατασκευής τους με τεχνολογίες λεπτών και παχέων στρωμάτων. Ως ηλεκτρόδια χρησιμοποιούνται υλικά στα οποία απορροφάται το προς ανίχνευση αέριο, όπως Pt, Ag/AgCl, N^COj ή BaCOj/NajCOj.…”

Section: αισθητήρες τύπου μπαταρίας βασισμένοι σε ηλεκτρολύτες (Solid and Liquid Electrolyte Fuel Cells)unclassified

Αισθητηρες Αεριων Βασισμενοι Σε Ημιαγωγιμες Διαταξεις Λεπτων Στρωματων

Papadopoulos¹,

Παπαδόπουλος²

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NASICON electrode for detecting sodium ions

Cited by 16 publications

References 5 publications

NASICON type ionic conductors for alkali ion sensing

NASICON type ionic conductors for alkali ion sensing

Síntesis y caracterización del conductor catiónico de sodio Na<sub>x</sub>(M<sub>y</sub>L<sub>1-y</sub>)O<sub>2</sub> (M = Ni<sup>2+</sup>, Fe<sup>3+</sup>; L = Ti<sup>4+</sup>, Sb<sup>5+</sup>)

Αισθητηρες Αεριων Βασισμενοι Σε Ημιαγωγιμες Διαταξεις Λεπτων Στρωματων

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