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 ...

We present our recent advances in the use of pulsed laser deposition (PLD) to fabricate active gain elements for use as amplifiers and laser oscillators. Record output powers exceeding 16 W and slope efficiencies of 70% are reported for optimized epitaxial growth of Yb(7.5%):YAG on to YAG substrates. We show for the first time that the performance of PLD material can meet or even exceed that of...

2014 We present results concerning sample dependence of not only the modulation wave vector, but also of the amplitude of the order parameter describing the N (A21am) ~ incommensurate phase transition in BaMnF4: X-ray diffraction, Cp (« DSC »), and birefringence measurements were performed on a wide set of crystals which were synthetized by Bridgman, Czochralski, and hydrothermal methods. The e...

The effect of stress (exerted by hydrostatic pressure of argon ambient enhanced up to 1.2 GPa) on the creation of oxygen-related defects in annealed Czochralski grown silicon (Cz-Si) was investigated. Concentrations of oxygen interstitials and of dislocations in Cz-Si samples with before-created nucleation centres for oxygen precipitation were markedly lower after pressure treatment at 1120 to ...

The lifetime degradation induced by light illumination or carrier injection which is observed in Czochralski-grown silicon (Cz-Si) leads to a significant decrease of solar cell efficiency. In this paper, realistic simulations of industrial type solar cells are performed by a simple empirical expression describing bulk lifetime as a function of the doping concentration. The optimal doping concen...

Germanides are an interesting class of two-component systems which consist metal and germanium. They similar in their structure with silicides but have the specific properties. The target investigation was finding main anodic electrochemical behaviour mechanisms for magnesium germanide Mn5Ge3 Na2SO4 aqueous solution.Electrochemical manganese obtained by Czochralski method investigated polarizat...

A new kind of borate crystalline material Sr3(BO3)2 with a similar calcite type structure was designed and synthesized by solid state reaction method, moreover, the single crystal growth was attempted with traditional Czochralski pulling method. Crystal phase of Sr3(BO3)2 was investigated by using X-Ray powder diffraction (XRPD) at room temperature and found similar to Ca3(BO3)2 crystal with sp...

Internal radiation was investigated using the finite volume method for the heat exchanger method (HEM) growth of oxide crystals. Special attention was devoted to the temperature and thermal stress distributions in the bottom region of the grown crystal at the end of the solidification process. The numerical results show that internal radiation strongly strengthens heat transport through the cry...