Investigation on degradation behavior in citric acid solution for MO-Al2O3-SiO2-B2O3 (M = Ba, Sr) glass and its doped BaTiO3 ceramics

Abstract

This study proposes an innovative strategy for developing a type of BaTiO₃ ceramic, which can degrade in citric acid solution, offering the potential for harmless degradation and recycling of BaTiO₃ ceramics widely used in the electronics field. The degradable BaTiO₃ ceramic has been designed and prepared using chemically active MO-Al₂O₃-SiO₂-B₂O₃ (M = Ba, Sr) (MASB) glass. By adjusting the glass content, the dielectric constant of the material increases from 725 to 1480. By investigating the physical and chemical interactions between MASB glass phases and BaTiO₃ ceramics, we systematically evaluated the degradation behavior in citric acid solution and the dielectric properties of the BaTiO₃ ceramics. The results show that the ratio of [TiO₆] units to [TiO₄] units in glass phases is a crucial factor in determining the chemical stability of BaTiO₃-doped MASB glass in citric acid solution. As the ratio of [TiO₆] units to [TiO₄] units increases from 0.347 to 0.464, the mass loss rate of the BaTiO₃-doped BASB glasses in citric acid decreases from 70% to 36.1%. Through SEM–EDS analysis of the BaTiO₃ ceramics, it was found that the degradation of MASB glass phase between the BaTiO₃ grains in citric acid solution triggers the structural disintegration of the BaTiO₃ ceramics.