Dilithium dialuminium trisilicate phase obtained using coal bottom ash

The Li2Al2Si3O10 glass-ceramics well crystallized and with a regular morphology was produced starting from a mixture of Li2CO3, TiO2, Al2O3 and coal bottom ash, after reducing the magnetite phase content. Its measured thermal expansion coefficient in the temperatures range from 25 °C to 300 °C is α(25-300) = −23.4 × 10−7 °C−1. This value is ≈18% smaller than that for the commercial lithium glass-ceramics (−23.4 × 10−7 °C−1 to 50 × 10−7 °C−1).