Abstract
Abstract Glasses with a constant B 2 O 3 and an increasing La 2 O 3 content in the system La 2 O 3 –SrO–B 2 O 3 were obtained by the usual melt quenching procedure. The crystallization and sinterability of the glasses were investigated by hot stage microscopy (HSM), differential thermal analysis (DTA), X-ray diffraction (XRD) analysis, transmission electron microscopy (TEM) and scanning electron microscopy (SEM). XRD analysis of the bulk samples evidenced the formation of the crystalline phases: La 2 SrB 10 O 19 , SrB 6 O 10 and SrLaBO 4 . XRD and TEM/SAED analyses showed a polymorphic crystallization of the glass sample containing 14.3 mol% La 2 O 3 with precipitation of the La 2 SrB 10 O 19 phase. SEM analysis confirmed the surface crystallization mechanism of this sample. The kinetics of crystallization of the same sample was examined by DTA and the activation energy of crystal growth was calculated by the Kissinger model to be E a =458±63 kJ mol –1 .
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