Institute of High Pressure Physics

Understanding GaN solubility in ammonothermal method is fundamental for the growth of high structural quality and large size crystals. When NaNH₂ is used as a mineralizer, retrograde solubility mode is obtained, i.e. solubility decreases with increasing temperature. The next Unipress Thursday Seminar will be devoted to the recent studies of ammonobasic NaNH₂–GaN–NH₃ system as a function of temperature, pressure, dissolution time, mineralizer concentration, and the surface area of GaN feedstock, opening the way to the improvement of the growth conditions.

The next Unipress Thursday Seminar will be given by dr inż. Tomasz Sochacki from Crystal Growth Laboratory, Institute of High Pressure Physics in the talk „On the solubility of GaN in the ammonothermal process – results and their thermodynamic analysis”.

Join us online via Zoom platform on Thursday, Februaty 27, 2025 at 3:00 pm. To get the link to Zoom meeting, please contact us at dyrekcja@unipress.waw.pl

Abstract of the talk is here.

Material doping without impurity atoms is possible in nitrides due to the presence of polarization gradient in the crystal. The emergence of polarization charges in concentration-graded AlGaN and InGaN materials will be discussed during the next Unipress Thursday Seminar by dr Konrad Sakowski from Laboratory of Nitride Semiconductor Physics, Institute of High Pressure Physics in the talk „Polarization doping in AlGaN and InGaN — numerical simulations”. Additionally, the issue of mobile charges in polarization doped alloys and the potential application of polarization doping for UV heterostructures will be discussed.

Join us online via Zoom platform on Thursday, November 28, 2024 at 3:00 pm. To get the link to Zoom meeting, please contact us at dyrekcja@unipress.waw.pl

Abstract of the talk is here.

Development of bioabsorbable metals is of great importance since they can be used to produce temporary implants, replacing permanent ones, and thus limiting some harmful side-effects related to their long-term presence in a patient body. One of the most promising materials for such an application is zinc (Zn) due to its optimal corrosion rate. However, the mechanical properties of pure zinc are far from being acceptable for a proposed application. Alloying with other elements and additional plastic deformation such as hydrostatic extrusion (HE) can significantly improve material strength thus enabling applications for orthopedic fixtures such as bone screw implants.

Institute of High Pressure Physics PAS invites you to its Unipress Thursday Seminar that will be given by dr inż. Jacek Skiba from Laboratory of Plastic Deformation Under High Pressure, Institute of High Pressure Physics. The talk is titled „Advanced zinc alloys for biomedical applications - Effect of plastic deformation by hydrostatic extrusion method on microstructure, mechanical and functional propertiess”

Join us online via Zoom platform on Thursday, October 31, 2024 at 3:00 pm. To get the link to Zoom meeting, please contact us at dyrekcja@unipress.waw.pl

Abstract of the talk is here.

Would you like to know what is needed to grow InGaN at higher temperatures in MBE not loosing on the indium content? And how these new growth conditions impact InGaN optical quality? What are the advantages of the MBE technology in the growth of III-nitride heterostructures? And how to benefit from them for the fabrication of such devices as light emitting devices operating in both forward and reverse bias, distributed feedback laser diodes with high spectral purity, or stacks of laser diodes for high power operation, just to name a few.

These subjects will be covered during the next Unipress Thursday Seminar by dr inż. Grzegorz Muzioł from MBE Laboratory, Institute of High Pressure Physics in the talk „Growth of InGaN by MBE: current status, opportunities and challenges”

Join us online via Zoom platform on Thursday, June 27, 2024 at 3:00 pm. To get the link to Zoom meeting, please contact us at dyrekcja@unipress.waw.pl

Abstract of the talk is here.