Microscopic Approach to Analyze Solar-Sail Space-Environment Effects

Near-sun space-environment effects on metallic thin films solar sails as well as hollow-body sails with inflation fill gas are considered. Analysis of interaction of the solar radiation with the solar sail materials is presented. This analysis evaluates worst-case solar radiation effects during solar-radiation-pressure acceleration. The dependence of the thickness of solar sail on temperature and on wavelength of the electromagnetic spectrum of solar radiation is investigated. Physical processes of the interaction of photons, electrons, protons and helium nuclei with sail material atoms and nuclei, and inflation fill gas molecules are analyzed. Calculations utilized conservative assumptions with the highest values for the available cross sections for interactions of solar photons, electrons and protons with atoms, nuclei and hydrogen molecules. It is shown that for high-energy photons, electrons and protons the beryllium sail is mostly transparent. Sail material will be partially ionized by solar UV and low-energy solar electrons. For a hollow-body photon sail effects including hydrogen diffusion through the solar sail walls, and electrostatic pressure is considered. Electrostatic pressure caused by the electrically charged sail's electric field may require mitigation since sail material tensile strength decreases with elevated temperature.Comment: 10 pages, 6 figures. Talk given on the 59 International Astronautical Congress, Glasgow, Scotland, 29 September - 2 October, 200

The d' dibaryon in the quark-delocalization, color-screening model

We study the questions of the existence and mass of the proposed $d' (IJ^P=00^-)$ dibaryon in the quark-delocalization, color-screening model (QDCSM). The transformation between physical and symmetry bases has been extended to the cases beyond the SU(2) orbital symmetry. Using parameters fixed by baryon properties and $NN$ scattering, we find a mild attraction in the $IJ^P=00^-$ channel, but it is not strong enough to form a deeply bound state as proposed for the $d'$ state. Nor does the (isospin) I=2 N$\Delta$ configuration have a deeply bound state. These results show that if a narrow dibaryon $d'$ state does exist, it must have a more complicated structure.Comment: 12 pp. latex, no figs., 2 tables, additional refs., Report-no was adde

Local study of the domain wall mobility in ferroelectric ceramics under the action of electric field and mechanical loading

The equipment of the Ural Center for Shared Use “Modern nanotechnology” was used. The reported study was funded by RFBR (grant No. 17-52-04074) and BRFFR (grant No. F17RM-036). This work was developed within the scope of the project CICECO-Aveiro Institute of Materials, POCI-01-0145-FEDER-007679 (FCT Ref. UID/CTM/50011/2013), financed by national funds through the FCT/MEC and when appropriate co-financed by FEDER under the PT2020 Partnership Agreement. This project has received funding from the European Union’s Horizon 2020 research and innovation program under the Marie Skłodowska-Curie grant agreement No 778070

Local electromechanical properties of barium strontium titanate based glass-ceramics

The equipment of the Ural Center for Shared Use “Modern Nanotechnology” Ural Federal University was used. The research was made possible by Russian Foundation for Basic Research (Grant 18-52-53032)

Tip-induced domain and phase structure transformation in lead free bismuth ferrite ceramics

The equipment of the Ural Center for Shared Use “Modern nanotechnology” UrFU was used. The research was made possible in part by the financial support of RFBR (Grant 16-32-60083-mol_a_dk)

Local study of electric field induced phase transition anti-ferroelectric-ferroelectric in lead-free bismuth ferrite ceramics

The equipment of the Ural Center for Shared Use “Modern nanotechnology” UrFU was used. The research was made possible in part by the Ministry of Education and Science of the Russian Federation (Contract 14.587.21.0022, UID RFMEFI58715X0022)

Indentation-induced local polarization reversal in La doped BiFeO3 ceramics

Stress-induced local polarization reversal was studied in La doped BiFeO3 ceramics under the action of indentation. Piezoresponse force microscopy was used for study of domain struc-ture before and after local polarization reversal. Two mechanisms of domain formation were revealed: (1) direct stress-induced and (2) stress mediated by grain clamping. Critical stress value for local polarization reversal was extracted from the dependence of the switched area on the applied loading force.The equipment of the Ural Center for Shared Use “Modern nanotechnology” Ural Federal University was used. The study was funded by RFBR (grant No. 17-52-04074) and BRFFR (grant No. F17RM-036), by Government of the Russian Federation (Act 211, Agreement 02.A03.21.0006). This work was developed within the scope of the project CICECO-Aveiro Institute of Materials, POCI-01-0145-FEDER-007679 (FCT Ref. UID/CTM/50011/2013), financed by national funds through the FCT/MEC and when appropriate co-financed by FEDER under the PT2020 Partnership Agreement. This project has received funding from the European Union’s Horizon 2020 research and innovation program under the Marie Skłodowska-Curie grant agreement No 778070

Effect of reactive gas environment on domain structure and local switching of LiNbO3 thin films deposited on Si(001) by radio-frequency magnetron sputtering

The equipment of the Ural Center for Shared Use “Modern nanotechnology” UrFU was used. The work was supported by Government of the Russian Federation (Act 211, Agreement 02.A03.21.0006) and by Russian Foundation for Basic Research (Grant 18-32-00959)

Dielectric Relaxation and Charged Domain Walls in (K,Na)NbO3-Based Ferroelectric Ceramics

The influence of domain walls on the macroscopic properties of ferroelectric materials is a well known phenomenon. Commonly, such “extrinsic” contributions to dielectric permittivity are discussed in terms of domain wall displacements under external electric field. In this work, we report on a possible contribution of charged domain walls to low frequency (10-106 Hz) dielectric permittivity in K1-xNaxNbO3 ferroelectric ceramics. It is shown that the effective dielectric response increases with increasing domain wall density. The effect has been attributed to the Maxwell-Wagner-Sillars relaxation. The obtained results may open up possibilities for domain wall engineering in various ferroelectric materials. © 2017 Author(s).The equipment of the Ural Center for Shared Use "Modern Nanotechnology" UrFU has been used. The research was made possible by the Ministry of Education and Science of Russian Federation (UID RFMEFI58715X0022). The authors acknowledge E. L. Rumyantsev and M. Morozov for useful discussion

Functional properties of the charged domain walls and phase boundaries in the BiFeO3 thin films and bulk ceramics

In this contribution, we go deeper in understanding the local properties of the interfaces in BFO thin films and RE-BFO ceramics in order to build a comprehensive behavioral model that captures both local and macroscopic electromechanical properties in the same materials.The equipment of the Ural Center for Shared Use "Modern nanotechnology" UrFU was used