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t treatment， seeding by 3 wt%ZrO2 as glass-composite and pulverization affected the amount， size and distribution of crystalline phases. SEM-EDS and XRD results revealed that crystalline phases presented in the devitrified glass–ceramic ... t treatment， seeding by 3 wt%ZrO2 as glass-composite and pulverization affected the amount， size and distribution of crystalline phases. SEM-EDS and XRD results revealed that crystalline phases presented in the devitrified glass–ceramic were barium aluminate (BaAl2O4)， barium aluminosilicate (BaAl2Si2O8) possibly with boron associated in its crystal structure， and barium zirconate (BaZrO3). CTE of the devitrified glass–ceramic was in the range of (10.1–13.0)  106 C1. Good adhesion was obtained both in the cases of glass and devitrified glass–ceramic with YSZ and AISI430 stainless steel. Interfacial phenomena between these components were discussed.  2008 Elsevier B.V. All rights reserved. 1. Introduction Solid oxide fuel cells (SOFCs) are a power source producing electricity via an electrochemical reaction. SOFCs have high energyconversion efficiency [1] and are environmentally friendly due to their low pollutant emission [1–3]. Electrochemical reactions in SOFCs occurred at the temperature range of 600–1000 C and required both oxidizing and reducing atmosphere [4]. Planar SOFCs are a type of SOFCs under development. An important consideration in planar SOFCs fabrication is hermetic sealing of all SOFC components， which are solid electrolyte， metallic interconnect， anode and cathode [5]. The seals must be thermochemically and mechanically compatible with other SOFC materials， should have high electrical resistance， and must be stable and long time durable under operating condition under H2 and H2O atmosphere [4，6]. Rigid sealing using glasses or glass–ceramics is a promising option