New high nickel-containing glass-ceramics based on Li2O-CaO-SiO2 eutectic (954 °C) system for magnetic applications

In the present work, the authors partially introduce NiO in the place of CaO into the 23.5Li(2)O-11.5CaO-55SiO(2) eutectic (954 +/- 4 degrees C) glass system to study the effect of composition modification on crystallization characteristics and magnetic behavior. Also, the effects of NiO contents on density, microhardness and chemical durability were examined. Lithium-based silicate glasses were prepared by a conventional melt-quenching technique, followed by a two-step heat-treatment to prepare glass-ceramics. The DTA results indicated that Tg of the synthesised glasses decreased with the increase of NiO content. The XRD indicated that Li-disilicate and their solid solution (Li,Ni)(2)Si2O6, Li2Ca3Si6O16 and quartz phases were crystallized, in addition to Niopside-CaNiSi2O6 and Ni2SiO4 phases. Adding NiO instead of CaO in the prepared glass-ceramics led to the formation of a dense structure with density values rising from 2.48 to 2.62 g/cm(3) and greatly improved in hardness number from 4410 to 5311 MPa. The chemical durability has also improved dramatically. The examined glass-ceramics had excellent magnetic properties with saturation magnetization (0.053 -0.44 emu/g), remanence magnetization (1.7-5.4 emu/g), and coercivity force (50-157 G).The study shows glass-ceramic with excellent properties that have attracted considerable attention in electronic devices, wear-resistance uses, and biomedicine applications.

Automated summary

In this study, the authors investigated the effects of composition modification on crystallization characteristics and magnetic behavior by partially introducing NiO into the 23.5Li(2)O-11.5CaO-55SiO(2) eutectic glass system. The addition of NiO improved the density, hardness, and chemical durability of the glass-ceramics, while also significantly enhancing their magnetic properties. These glass-ceramics show great potential in electronic devices, wear-resistance uses, and biomedicine applications.