Magnesium aluminosilicate and magnesium borosilicate glass formulations were developed evaluated for the immobilisation of radioactive waste known as Magnox sludge. Glass compositions synthesised using two simplified bounding simulants, including corroded metallic uranium at loadings up to 50 wt.%. The glasses immobilising simulant formed generally homogenous fully amorphous glasses, while thos...

Sodium borosilicate glasses containing various concentrations of rhenium or technetium were fabricated, and their vibrational spectra studied using a Raman microscope. Spectra were interpreted with reference to new high resolution measurements of alkali pertechnetates and perrhenates NaReO4, KReO4, NaTcO4, and KTcO4. At low concentrations of ReO4 or TcO4 , glass spectra show weak peaks superimp...

We present a model of He relaxation on the surface of borosilicate glass which accurately predicts observed relaxation rates and their temperature dependence. Above room temperature He dissolves into Pyrex, where interactions with Fe3þ ions result in a relaxation time of 1 ms. Gas exchange across the glass surface of an enclosed vessel leads to T 1 1 1⁄4 A=V ð3:9 1:4Þ 10 2 cm/h at room temperat...

In this study, different glasses were investigated to improve reusable investments. Borosilicate glass (BSG) powder and soda-lime glass (SLG) powder were prepared by milling broken beakers and microscope slides, respectively, and used in experimental investments (I-BSG, I-SLG) by blending glass powder (10 wt%) with cristobalite (90 wt%). Some properties and casting fits were evaluated with comm...

We studied the morphology of borosilicate glass surface machined by femtosecond laser pulses. Our observations show that a thin rim is formed around ablated craters after a single laser pulse. When multiple laser pulses are overlapped, the crater rims also overlap and produce a surface roughness. The rim appears to be a resolidified splash from a molten layer generated during the ablation proce...

This paper describes an experimental test of the uni®ed theory of thermal shock. A borosilicate glass (78.1%SiO2± 13.3%B2O3±4.7%Na2O±3.4%Al2O3) subjected to ion-exchange in molten KNO3, was used. The theory predicts the critical temperature di€erence for fracture initiation by thermal shock; however, it overestimates the number of cracks which propagate simultaneously. Despite that fact, taken ...

Efficient cleavage of sterically hindered boronic esters of asymmetric diols to recover both the diol and a more reactive borane derivative has been a challenging problem. A remarkable borosilicate glass-catalyzed cleavage with thionyl chloride and imidazole proved less useful than hoped for. Potassium bifluoride converts boronic esters to diols and alkyltrifluoroborates. These with chlorosilan...

We present a practical method to determine femtosecond laser induced refractive index changes in transparent materials. Based on an iterative Fourier transform algorithm, this technique spatially resolves the refractive index of complex structures by combining the dimensions of the modified region with the corresponding phase change extracted from far-field intensity measurements. This approach...