Effect of strontium-to-calcium ratio on the structure, crystallization behavior and functional properties of diopside-based glasses
authors Reddy, AA; Tulyaganov, DU; Mather, GC; Pascual, MJ; Kharton, VV; Bredikhin, SI; Kolotygin, VA; Ferreira, JMF
nationality International
journal INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
author keywords Solid oxide fuel cells; Sealant; Structure; Crystallization; Thermal stability
keywords OXIDE FUEL-CELL; CERAMIC SEALANTS; ALUMINOSILICATE GLASSES; SEALING GLASS; PHYSICAL-PROPERTIES; SINTERING BEHAVIOR; SI-29 NMR; SUBSTITUTION; SILICATE; INTERCONNECT
abstract The role of Sr/Ca ratio, which was varied from 3/6 to 9/0, on the structure, crystallization behavior and properties of diopside-based glass and glass-ceramic sealants targeted to solid oxide fuel cell (SOFC) applications was evaluated. The structural changes undergone by glass-powder compacts during isothermal heat treatment at 850 degrees C for 1-1000 h were investigated using XRD (X-ray diffraction) analysis, including quantitative Rietveld refinement, and MAS-NMR (magic angle spinning nuclear magnetic resonance) techniques. The tendency towards crystallization was retarded with increasing Sr/Ca ratio. Diopside-based phases, strontium akermanite and magnesium silicate were developed under various heat-treatment conditions. MAS-NMR analysis of glasses heat treated for 1000 h revealed that with increasing Sr/Ca ratio, Q(1) and Q(4) structural units were formed at the expenses of Q(2) units. The good thermal stability and chemical compatibility of the new glass-ceramic compositions coupled with their mechanical reliability and high electrical resistivity make them attractive for further experimentation as sealants for SOFCs. Copyright (C) 2013, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
publisher PERGAMON-ELSEVIER SCIENCE LTD
issn 0360-3199
year published 2014
volume 39
issue 7
beginning page 3552
ending page 3563
digital object identifier (doi) 10.1016/j.ijhydene.2013.12.104
web of science category Chemistry, Physical; Electrochemistry; Energy & Fuels
subject category Chemistry; Electrochemistry; Energy & Fuels
unique article identifier WOS:000331917400052
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