No (565)
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CrystalCMP: examples of use
Rohlíček, Jan
2020 - English
The program CrystalCMP can be used for comparison of crystal structures containing separated molecular objects as it is, for instance, in molecular crystals or some metal-organic compounds. The program can be useful in many different situations. This article shows the use of the program CrystalCMP on three basic exam ples for which the program was primarily intended.
Keywords:
molecular packing; comparison; similarity
Available at various institutes of the ASCR
CrystalCMP: examples of use
The program CrystalCMP can be used for comparison of crystal structures containing separated molecular objects as it is, for instance, in molecular crystals or some metal-organic compounds. The ...
Nanopowders of R.sub.2./sub.Fe.sub.14./sub.B-type compounds in high magnetic fields: The effects of substitutional and interstitial atoms on inter-sublattice exchange interaction
Paukov, M.; Ivanov, L.; Tereshina, I.; Tereshina-Chitrova, Evgenia; Gorbunov, D.; Andreev, A. V.; Pyatakov, A.P.; Granovsky, S.A.; Doerr, M.; Drulis, H.
2020 - English
The fundamental magnetic characteristics of R2Fe14B intermetallics are highly sensitive to atomic substitutions and interstitial absorption of light elements. In this work, both were combined, and the influence of the substitutions in the R-sublattice and hydrogen absorption on the magnetization of (RR’) 2Fe14BHx (R is Tm or Er, and R’ is Nd) in magnetic fields up to 58 T was studied. By using direct hydrogen absorption, (R0.5Nd0.5)2Fe14BHx compounds were obtained with hydrogen content 0≤x≤5.5. Magnetic measurements were carried out on nanopowders. The strength of the inter-sublattice coupling in (R0.5Nd0.5)2Fe14B and their hydrides is estimated by analysing high-field magnetization data. It is shown that hydrogenation weakens the inter-sublattice exchange interaction up to 45 %.
Keywords:
rare earth; intermetallics; powder metallurgy; magnetism in solids; hydride properties
Available at various institutes of the ASCR
Nanopowders of R.sub.2./sub.Fe.sub.14./sub.B-type compounds in high magnetic fields: The effects of substitutional and interstitial atoms on inter-sublattice exchange interaction
The fundamental magnetic characteristics of R2Fe14B intermetallics are highly sensitive to atomic substitutions and interstitial absorption of light elements. In this work, both were combined, and the ...
Nanosecond laser damage of metallic mirrors
Muresan, Mihai-George; Pilná, Kateřina; Čech, Pavel; Mydlář, Martin; Vanda, Jan; Navrátil, Petr
2020 - English
Laser surface processing is an established method to introduce surface functionalities on solid surfaces with the required throughputs for a commercial process. Fabrication of laser induced surface structures in an effective matter is done by laser interaction studies, which reveal the best processing parameters (laser wavelength, fluence, repetition, together with the processing speed and environment). Customized solutions are providing the best yields and they are being implemented faster than ever. However, the optics manufacturers are not being to keep up the pace with the new requirements, so they turn instead on older, but safer technology. In order to get a better understanding of optics capabilities, thorough testing is required. Common laser metallic mirrors, commercially available, are being rigorously tested using a nanosecond Yb:YAG laser and the results are compared with the vendor’s information.\n
Keywords:
laser patterning; metallic mirrors; LIDT; nanosecond laser testing
Available at various institutes of the ASCR
Nanosecond laser damage of metallic mirrors
Laser surface processing is an established method to introduce surface functionalities on solid surfaces with the required throughputs for a commercial process. Fabrication of laser induced surface ...
Studium vlivu složení ve směsi CsCl-HfCl.sub.4./sub. na její tepelné vlastnosti v uzavřeném systému pomocí DSC analýzy
Král, Robert; Zemenová, Petra; Vaněček, Vojtěch; Bystřický, Aleš
2020 - Czech
Příspěvek se zabývá studiem tepelného chování směsi CsCl-HfCl4 o různém složení (nadbytek Cs- nebo Hf-složky) v uzavřeném systému (křemenné ampuli) pomocí neizotermní DSC analýzy. Ze získaných výsledků a jejich porovnáním s fázovým diagramem CsCl-HfCl4 bylo možné získat důležité informace potřebné k optimalizaci růstu krystalů Cs2HfCl6 vertikální Bridgmanovou metodou. This contribution deals with the study of thermal behavior of CsCl-HfCl4 mixture of various composition (containing excess of Cs- or Hf-component) in enclosed system (quartz ampoule) by non-isothermal DSC analysis. Important information necessary for optimization of the Cs2HfCl6 crystal growth by the vertical Bridgman method were obtained from the comparison of the recorded results and the CsCl-HfCl4 phase diagram.
Keywords:
CsCl-HfCl.sub.4./sub.; thermal properties; DSC analysis in closed system
Available at various institutes of the ASCR
Studium vlivu složení ve směsi CsCl-HfCl.sub.4./sub. na její tepelné vlastnosti v uzavřeném systému pomocí DSC analýzy
Příspěvek se zabývá studiem tepelného chování směsi CsCl-HfCl4 o různém složení (nadbytek Cs- nebo Hf-složky) v uzavřeném systému (křemenné ampuli) pomocí neizotermní DSC analýzy. Ze získaných ...
Book of Abstracts of the 30.sup.th./sup. Joint Seminar of the Development of Materials Science in Research and Education
Kožíšek, Zdeněk; Král, Robert; Zemenová, Petra
2020 - English
Conference topics: \n- Trends in development of materials research\n- Education of materials science at the universities \n- Information about the research programmes of individual institutions \n- Information on equipment for preparation and characterisation of materials \n- Results of materials science research.
Keywords:
material sciences
Available at various institutes of the ASCR
Book of Abstracts of the 30.sup.th./sup. Joint Seminar of the Development of Materials Science in Research and Education
Conference topics: \n- Trends in development of materials research\n- Education of materials science at the universities \n- Information about the research programmes of individual institutions \n- ...
Závěrečná zpráva projektu „Efektivní využití odpadního tepla“ reg. č. CZ.07.1.02/0.0/0.0/16_040/0000384 realizovaném v rámci výzvy č. 24 OP PPR , technologie 3, stacionární vysokopotenciální zdroje odpadního tepla
Hejtmánek, Jiří; Stachura, Jan
2020 - Czech
Cílem projektu bylo ověřit možnost využití termoelektrických generátorů (dále TEG) k výrobě elektrické energie z odpadního tepla, které je produkováno spalováním fosilního paliva v dopravních prostředcích. S ohledem na charakter jízdního cyklu prostředků veřejné dopravy jsme se na základě konzultací a prozkoumání možností experimentálního testování soustředili na ověření možnosti lepšího využití energie produkované nezávislým topením (NT) s cílem alespoň částečného pokrytí jeho potřeby elektrické energie, která je nutná k jeho provozu. Při provozu NT v autobuse dochází totiž k odběru elektrické energie cca 360 W z elektrické soustavy autobusu, která je potřeba pro pohon oběhového čerpadla, ventilátorů topení a řídící elektroniky NT.\n The aim of the project was to use the waste thermal energy of flue gases or hot steam to produce electricity through thermoelectric generators (TEG). The local production of electricity at the place of its consumption will enable, for example, power source of autonomous sensors, including wireless transmission of necessary information to the control center or power source of safety lights, without installation of the electric cables from the distant power source, which is sometimes technologically difficult. Another specific possible utilization was aimed at the replacement of disposable batteries, which supply the necessary sensors and at the same time serve for sending data to the control center, which is energy demanding.\n
Keywords:
využití odpadniho tepla; termoelektrická konverse
Available at various institutes of the ASCR
Závěrečná zpráva projektu „Efektivní využití odpadního tepla“ reg. č. CZ.07.1.02/0.0/0.0/16_040/0000384 realizovaném v rámci výzvy č. 24 OP PPR , technologie 3, stacionární vysokopotenciální zdroje odpadního tepla
Cílem projektu bylo ověřit možnost využití termoelektrických generátorů (dále TEG) k výrobě elektrické energie z odpadního tepla, které je produkováno spalováním fosilního paliva v dopravních ...
Mass production of hydrogenated ZnO nanorods
Chang, Yu-Ying; Remeš, Zdeněk; Míčová, J.
2020 - English
We have developed an inexpensive and efficient technology of hydrothermal growth of ZnO nanorods from zinc nitrate hexahydrate (Zn(NO3)2·6H2O), as a precursor and hexamethylenetetramine (HMTA) (C6H12N4), as a surfactant followed by plasma hydrogenation in a novel inductively coupled plasma (ICP) quartz reactor and equipped with the rotary sample holder to stir powder during plasma treatment. We have optimized the photoluminescence spectroscopy for measuring optical scattering samples with the high sensitivity, precise sample positioning and very low influence of the scattered excitation light. Here we present the latest results on the enhancement of the UV photoluminescence of the ZnO nanorods after plasma hydrogenation. The exciton-related photoluminescence has been significantly enhanced whereas the deep defect related yellow photoluminescence has been significantly decreased.\n
Keywords:
nanomaterials; ZnO; photoluminescence; excitons; inductively coupled plasma; hydrogenation
Available at various institutes of the ASCR
Mass production of hydrogenated ZnO nanorods
We have developed an inexpensive and efficient technology of hydrothermal growth of ZnO nanorods from zinc nitrate hexahydrate (Zn(NO3)2·6H2O), as a precursor and hexamethylenetetramine (HMTA) ...
Laser-induced surface acoustic waves for thin film characterization
Kudělka, R.; Václavek, L.; Tomáštík, Jan; Malecová, S.; Čtvrtlík, R.
2020 - English
Knowledge of mechanical properties of thin films is essential for most of their applications.However, their determination can be problematic for very thin films. LAW (Laser-induced acousticwaves) is a combined acousto-optic method capable of measuring films with thickness from fewnanometers. It utilizes ultrasound surface waves which are excited via short laser pulses and detectedby a PVDF foil. Properties such as Young’s modulus, Poisson’s ratio and density of both the film andthe substrate as well as film thickness can be explored.Results from the LAW method are successfullycompared with nanoindentation for Young’s modulus evaluation and with optical method for filmthickness evaluation and also with literature data. Application of LAW for anisotropy mapping ofmaterials with cubic crystallographic lattice is also demonstrated
Keywords:
anisotropy; laser-induced surface acoustic waves; nanoindentation; Young’s modulus; thin films
Available at various institutes of the ASCR
Laser-induced surface acoustic waves for thin film characterization
Knowledge of mechanical properties of thin films is essential for most of their applications.However, their determination can be problematic for very thin films. LAW (Laser-induced acousticwaves) is a ...
Characterization of titanium laser welds
Chmelíčková, H.; Hiklová, H.; Václavek, L.; Tomáštík, J.; Čtvrtlík, Radim
2020 - English
Butt welding of commercially pure titanium Grade 1 and Ti6Al4V alloy sheets using a pulsed Nd:YAG laser KLS 246 - 102 LASAG were carried out to determine optimal values of pulse energy and pulse length to create completely penetrated weld. Surface peak power density of about 3.105 W.cm−2 was found as an optimal value. Weld dimensions, both face width and penetration depth, are found to be proportional to increasing energy and decreasing pulse length. Gentle sagging and root penetration were revealed by means of contact surface profilometry. The nanohardness tests on transverse cross-sections detected approximately 50% higher hardness in the fusion zone than in the base material.\n
Keywords:
elasticity; laser welding; nanohardness; surface profile; titanium
Available at various institutes of the ASCR
Characterization of titanium laser welds
Butt welding of commercially pure titanium Grade 1 and Ti6Al4V alloy sheets using a pulsed Nd:YAG laser KLS 246 - 102 LASAG were carried out to determine optimal values of pulse energy and pulse ...
Fracture behavior of FeAlSi intermetallics
Čech, J.; Haušild, P.; Karlík, M.; Nová, K.; Průša, F.; Novák, P.; Kopeček, Jaromír
2020 - English
The study is devoted to the intermetallic alloy FeAl20Si20 (wt.%) with the potential applications in high temperature aggressive environments. The samples of the same chemical composition were prepared by spark plasma sintering from the different mechanically alloyed powders (pure elements and pre-alloyed powders).
Keywords:
FeAlSi; fracture toughness; nanoindentation; SPS
Available at various institutes of the ASCR
Fracture behavior of FeAlSi intermetallics
The study is devoted to the intermetallic alloy FeAl20Si20 (wt.%) with the potential applications in high temperature aggressive environments. The samples of the same chemical composition were ...
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