A Significant Role of MoO3 on the Optical, Thermal, and Radiation Shielding Characteristics of B2O3-P2O5 -Li2O Glasses

Glasses based on borophosphate with the formula 42.5P2O5 – 42.5B2O3 – (15-x) Li2O – xMoO3 mol% where 𝑥 = (0 ≤ 𝑥 ≥ 15) were manufactured using the melt-quenching methodology. The status of prepared samples wasidentified by (XRD). The temperature of the glass transition Tg, the temperature of onset glass crystallisation Tc and the temperature of the crystallisation Tp were evaluated using a differential thermal analyser (DTA). The energy gap (𝐸𝑜𝑝𝑡), Urbach (𝐸𝑢), and parameters of dispersion were calculated through the data of optical spectra. Physical properties were determined and calculated, such as molar refractivity, metallization, electron polarizability, electronegativity, loss of reflection and dispersion parameters. Raising MoO3 at the expense of Li2O was used to assess the level of protection. For radiation protection applications, the glasses under investigation had superior characteristics.

Generalised kinetics of overall phase transition useful for glass crystallisation when assuming non-isothermal conditions

The modelling of reaction kinetics is a fashionable subject of publications. We developed an analogue of the KJMA equation under non-isothermal conditions α(T)=1−exp(−(T/θ)N) that describes the dependence of degree of transformation α(T) at a constant rate, q, of heating with characteristic temperature θ(q) and power N, proportional to the Avrami parameter, n. This equation is valid even when the activation energy of the process is not constant. We demonstrate that reliable information about the activation energy is obtained when the experimental data are plotted in coordinates: logq (heating rate) against logTp (peak temperature).

Persistent energy transfer in ZGO:Cr3+,Yb3+: a new strategy to design nano glass-ceramics featuring deep red and near infrared persistent luminescence

ZnGa2O4:Cr3+,Yb3+ nanocrystals, elaborated via glass crystallisation, show strong deep red and near infrared persistent luminescence chargeable by red light.

Theoretical thermo-optical patterns relevant to glass crystallisation

Mie computations are performed to evaluate light scattering on the virtual microstructures relevant to lithium disilicate glass internal crystallisation. The computations are expressed in the form of optical transmission (OT) patterns evolved on a scale of growing lithium disilicate crystals. Input data include the crystals number density, their size, the wavelength of the incident electromagnetic radiation, the indices of refraction of the lithium disilicate glassy and crystalline phases and the thickness of the virtual glass slab. In the computations, the spherical shape of crystals and their random distribution are assumed. The results reveal the quantitative effects of individual input data constants on the overall course of the computed OT patterns. They also relate the computed OT data magnitudes to the corresponding glass crystallinity (α). In addition, they point to singular combinations of the input data constants defining the conditions under which the OT data could potentially stand for the kinetically important α data. Finally, the results aid better recognition of some fundamental as well as practical properties of the optical thermal methods based on the optical transmission measurements.