Solid phase transitions and fast ion transport in LiNaSO[sub 4]: LiCl: Na[sub 2]WO[sub 4] mixed systems

Journal Article · Fri Oct 01 00:00:00 EDT 1993 · Journal of Solid State Chemistry; (United States)

DOI:https://doi.org/10.1006/jssc.1993.1283· OSTI ID:5050019

Prabaharan, S R.S.; Muthusubramanian, P ^[1]; Kulandainathan, M A; Kapali, V ^[2]

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1. Madurai Kamaraj Univ. (India)
2. Central Electro-chemical Research Institute, Karaikudi (India)

LiNaSO[sub 4]: LiCl: Na[sub 2]WO[sub 4] composites of a few different compositions have been prepared by quenching the melt and studied for the first time with a view to improve the ionic conductivity of LiNaSO[sub 4] at the lowest possible temperature. The phase formations of the composites have been analyzed by means of X-ray powder diffraction technique. The transport properties have been studied by DSC and complex ac impedance analysis (to extract the dc electrical conductivity, [sigma][sub dc]). The X-ray diffractograms show evidence for solid solutions (ss) as well as second dispersed phase due to indissolved excess compound (LiCl). The [sigma] enhancement may be attributed to the increase in interfacial conductivity due to the increase in concentration of the charge carriers (ions or vacancies) forming a diffuse space charge layer between the two ion conductors, i.e., the solid solution of LiNaSO[sub 4] with dissolved chloride and tungstate fractions and a chloride phase with dissolved sulfate fraction. DSC measurements show improved thermal properties with respect to [alpha]-LiNaSO[sub 4]. The present composite mixtures offer the choice of lower transition temperatures, but these are accompanied by lower transition enthalpies.

• OSTI ID: 5050019
• Journal Information: Journal of Solid State Chemistry; (United States), Vol. 106:2; ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
25 ENERGY STORAGE
LITHIUM CHLORIDES
IONIC CONDUCTIVITY
PHASE TRANSFORMATIONS
LITHIUM SULFATES
SODIUM SULFATES
SODIUM TUNGSTATES
CALORIMETRY
CHEMICAL PREPARATION
ELECTRIC CONDUCTIVITY
THERMODYNAMIC PROPERTIES
X-RAY DIFFRACTION
ALKALI METAL COMPOUNDS
CHLORIDES
CHLORINE COMPOUNDS
COHERENT SCATTERING
DIFFRACTION
ELECTRICAL PROPERTIES
HALIDES
HALOGEN COMPOUNDS
LITHIUM COMPOUNDS
LITHIUM HALIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SCATTERING
SODIUM COMPOUNDS
SULFATES
SULFUR COMPOUNDS
SYNTHESIS
TUNGSTATES
360202* - Ceramics
Cermets
& Refractories- Structure & Phase Studies
250903 - Energy Storage- Batteries- Materials
Components
& Auxiliaries