Effects of lanthanum oxide on the properties of barium-free alkaline-earth borosilicate sealant glass

摘要: Abstract We have explored the effects of lanthanum oxide (La 2 O 3 ) on properties barium-free SrO–CaO–ZnO–B –SiO glass system varying its content from 0 to 6 mol%. The coefficient thermal expansion and transition temperature glasses are found be in ranges 10.6–10.8 × 10 − 6 /K (50–600 °C) 650–690 °C respectively. Differential scanning calorimetric studies revealed an increase crystallization peak stability up 4 mol% then decrease further addition. A monotonic characteristic shrinkage powder compact is observed addition La as heating stage microscopic study. X-ray diffraction reduced intensity added glasses. Fourier transformed infrared spectra disclosed that stabilized structure by reducing number non-bridging oxygens. Vickers micro hardness varied range 2.6–5.6 GPa. Scanning electron microscopy formation particulate nature microstructures parent which not Activation energy has increased 331 361 kJ/mol determined Kissinger Augis–Bennett models. Above these clearly advocate their applicability solid fuel cell sealants.