When an oxidic system, vitreous or crystalline is subject to a thermal treatment, a series of modifications for steric characteristics at atomic level take place (number of coordination, inter-nuclear distances, angles between orbital bond). Consequently, we expect that these changes to influence a series of properties dependent of system structure at this level.

    In the paper a tentative of quantitative appreciation for thermal treatment effect on basicity of some oxidic system is presented.

    For the beginning, the references are made depending on the simplest silicatic system, SiO₂ respectively. The temperature effect on steric characteristics and implicitly on basicity percentage is pointed out.