Platinum catalyzed crystallization of Li2O·2SiO2 glass

The mechanism of deceleration of nucleation and crystal growth by the small addition of transition metals to lithium disilicate glasses

“…Moreover, the effect of small amounts of additives which promote nucleation (e.g. water43, platinum44454647 or P 2 O 5 484950) on the nucleation rates as well as on the crystal growth velocities was studied. In the case of the addition of water, the effect was reported to be related to a decrease of the kinetic barrier for nucleation due to lower viscosities, rather than changing the thermodynamic barrier of nucleation, i.e.…”

Effect of Pt doping on nucleation and crystallization in Li2O · 2SiO2 glass: experimental measurements and computer modeling

“…Rindone [12], for example, demonstrated the effectiveness of platinum particles in precipitating lithium disilicate crystals from lithium disilicate glass. Cronin and Pye [13] have investigated the effect of Pt particle size on the crystallization of lithium disilicate glass. Heterogeneous or catalyzed nucleation, however, has received less theoretical attention than has homogeneous nucleation.…”

Role of Tin Oxide as a Nucleating Agent with Low Solubility in BaO–SrO–ZnO–SiO2 Glasses Studied by Electron and X-ray Microscopy

“…Depending on the glass system, different nucleating agents can be used. The most common ones are ZrO 2 and TiO 2 , which promote volume crystallization in many alumosilicate glasses. − Another suitable oxide is P 2 O 5 , which is able to trigger volume crystallization, for example, in lithium disilicate glasses. − Furthermore, it is known for decades that noble metals may act as nucleating agents in oxide glasses. − However, concerning the role of such noble metals as nucleating agents in glasses and especially the nucleation mechanism, detailed experimental studies have been scarcely reported in the literature so far …”