lead antimonate yellow and lead-tin-antimony yellow) have been produced, starting from various recipes and from pure chemicals, in different experimental conditions. The products were analysed using micro-Raman spectroscopy. Differences in stoichiometric ratios, in melting temperatures and in crucible typologies were examined. Other analytical techniques were required to characterize the stoich...

The radiofrequency (rf) oven can be used as a metal vapour injector for Electron Cyclotron Resonance ion sources; the application to high temperature boiling metals (like Cr, Ti and V) was recently demonstrated. Duration and reusability of oven parts were good, since only crucible needs to be maintained at a high temperature Ts. For vanadium case, achieved Ts was over 2300 K with about 280 W of...

The classical method of melting lead by fire-assay (Pb-FA) is the most frequently used analytical technique in gold prospection. The crucible solid waste which is generated in this process is usually characterized by chemical and mineralogical composition, granulometric size distribution, and classified according to Brazilian Environmental Regulations. This study demonstrates how acid leaching ...

A Robot Assisted Crucible charging System (RACS) has been proposed in the automation of the crucible packing process in the CZ semiconductor wafer production procedure, involving the delicate manipulation and placement of polycrystalline silicon nuggets, into a stiff and fragile fused silica crucible. Two of the key elements in this design have been described in this thesis, a non-intrusive nug...

Single crystals of triclinic Pr(2)(B(2)O(5))(MoO(4)) were prepared from an incongruently melting flux in the system Pr(2)O(3)-MoO(3)-B(2)O(3) in a platinum crucible in an atmosphere of air. In the crystal structure, distorted edge-sharing [PrO(8)] square anti-prisms form a three-dimensional framework. These are further linked by isolated [MoO(4)] tetra-hedra and isolated pyroborate groups [B(2)...

A recent numerical approach for the study of three-dimensional instabilities of axisymmetric melt flows in Czochralski crucible is described. The convergence studies and comparisons with previously published experimental and numerical data are reported. Convergence requirements are estimated. Basing on a certain experimental configuration we give an example of the stability diagram which shows ...