scholarly journals Radiation tolerance of nanostructured TiZrSiN coatings

2020 ◽  
Vol 64 (5) ◽  
pp. 534-543
Author(s):  
F. F. Komarov ◽  
S. V. Konstantinov ◽  
V. A. Zaikov ◽  
V. V. Pilko
Keyword(s):  
Open Space ◽  
Nitrogen Concentration ◽  
Structural Phase ◽  
Nitrogen Deficiency ◽  
Hydrogen Ions ◽  
X Ray Diffraction ◽  
Structural Phase State ◽  
X Ray ◽  
The Earth ◽  
Radiation Resistant

Nanostructured TiZrSiN coatings were formed on various types of substrates in regimes with a lack and stoichiometric nitrogen concentration using reactive magnetron sputtering. Using the methods of scanning electron microscopy and X-ray diffraction, the structural-phase state of the initial coatings, their thickness, and morphology were investigated. Nanoindentation tests according to the methods of Oliver and Farr, as well as tribomechanical tests were performed to determine hardness, Young's modulus and friction coefficient of the TiZrSiN coatings. The TiZrSiN coatings were irradiated with hydrogen ions H+ with an energy of 500 keV in the fluence range from 1 • 1016 to 1 • 1017 ions/cm2 on the AN 2500 accelerator complex. It was found that TiZrSiN nanostructured coatings deposited in nitrogen deficiency and stoichiometry regimes are radiation-resistant and potentially promising for use as protective on the bodies of small aircraft in orbit of the Earth and in open space.

Electron-Beam Welding - Structural-Phase State and Microhardnes in the Weld Zone in a Submicrocrystalline Titanium Alloy Grade2

2017 ◽  
Vol 906 ◽  
pp. 32-37 ◽  
Author(s):  
Vasilii A. Klimenov ◽  
Anatolii A. Klopotov ◽  
Yu.A. Abzaev ◽  
K.A. Kurgan ◽  
Yu.A. Vlasov
Keyword(s):  
Titanium Alloy ◽  
Heat Affected Zone ◽  
Phase State ◽  
Electron Beam Welding ◽  
Structural Phase ◽  
Weld Zone ◽  
X Ray Diffraction ◽  
Structural Phase State ◽  
X Ray ◽  
Microhardness Distribution

The paper presents the results of the X-ray diffraction analysis of structural-phase states in the weld zone of a titanium alloy Grade2 in micro-and submicrocrystalline states. It is established that the structural-phase state in the weld zone and in the heat-affected zone depends on the state of samples of the alloy Grade2 before welding. It is shown that formation process of metastable phases ω-Ti and α′′-Ti occurs in the submicrocrystalline state in the alloy Grade2 in the weld zone and in the heat-affected zone. Investigations of the features of the microhardness distribution in the weld zone in alloys Grade2 in micro-and submicrocrystalline states are carried out. Different character of microhardness distributions in the weld zone in the samples depending on the structural-phase state of welded plates made of alloy Grade2 is determined.

Structural-Phase State Analysis of Calcium Mono-Aluminate

2014 ◽  
Vol 1013 ◽  
pp. 102-107 ◽  
Author(s):  
Yurii A. Abzaev ◽  
Yurii Sarkisov ◽  
Dmitrii Afanas'ev ◽  
Anatolii A. Klopotov ◽  
Nikolaii Gorlenko ◽  
...  
Keyword(s):  
Rietveld Refinement ◽  
Structural Phase ◽  
Quantitative Phase Analysis ◽  
Stable Phase ◽  
X Ray Diffraction ◽  
Phase Mixing ◽  
Structural Phase State ◽  
X Ray ◽  
Mixing Energy ◽  
Refinement Method

The paper presents results of the Rietveld refinement method in X-ray diffraction quantitative phase analysis of calcium mono-aluminate, the mineral. It has been stated that the theoretical calcium mono-aluminate CaO⋅Al2O3. is a high-stable phase, mixing energy of which is equal to 16214,10 eV.Ab-initiocalculations and Rietveld refinement method were used to identify die structural state of CaO⋅Al2O3.

Temperature-induced structural phase transitions in RERhSn (RE = Y, Gd-Tm, Lu)

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Simon Engelbert ◽  
Rolf-Dieter Hoffmann ◽  
Jutta Kösters ◽  
Steffen Klenner ◽  
Rainer Pöttgen
Keyword(s):  
Rare Earth ◽  
Phase Transitions ◽  
Driving Force ◽  
Room Temperature ◽  
Structural Phase ◽  
Structural Phase Transitions ◽  
Line Broadening ◽  
X Ray Diffraction ◽  
Temperature Dependent ◽  
X Ray

Abstract The structures of the equiatomic stannides RERhSn with the smaller rare earth elements Y, Gd-Tm and Lu were reinvestigated on the basis of temperature-dependent single crystal X-ray diffraction data. GdRhSn crystallizes with the aristotype ZrNiAl at 293 and 90 K. For RE = Y, Tb, Ho and Er the HP-CeRuSn type (approximant with space group R3m) is already formed at room temperature, while DyRhSn adopts the HP-CeRuSn type below 280 K. TmRhSn and LuRhSn show incommensurate modulated variants with superspace groups P31m(1/3; 1/3; γ) 000 (No. 157.1.23.1) (γ = 3/8 for TmRhSn and γ = 2/5 for LuRhSn). The driving force for superstructure formation (modulation) is a strengthening of Rh–Sn bonding. The modulation is expressed in a 119Sn Mössbauer spectrum of DyRhSn at 78 K through line broadening.

Structural-phase transition in (Cu2Te)2−x(ZnTe)x at high temperature

2021 ◽  
pp. 2150113
Author(s):  
H. B. Gasimov ◽  
R. M. Rzayev
Keyword(s):  
Phase Transition ◽  
Phase Transitions ◽  
High Temperature ◽  
Single Crystals ◽  
Structural Phase ◽  
X Ray Diffraction ◽  
X Ray ◽  
Temperature Range ◽  
Xrd Study ◽  
Xrd Method

Cu2Te single crystal was grown by the Bridgman method. X-ray diffraction (XRD) study of Cu2Te single crystals in the temperature range of 293–893 K was performed and possible phase transitions in the mentioned range of temperature have been investigated. (Cu2Te)[Formula: see text](ZnTe)[Formula: see text] single crystals also were grown with [Formula: see text], 0.05, 0.10 concentrations and structural properties of the obtained single crystals were investigated by the XRD method in the temperature range 293–893 K. Lattice parameters and possible phase transitions in the mention temperature range were determined for (Cu2Te)[Formula: see text](ZnTe)[Formula: see text] single crystals for [Formula: see text], 0.05, 0.10 concentrations.

Effect of technological parameters of gas-dynamic deposition on structural-phase transformations in “brass” type coating

2020 ◽  
pp. 554-559
Author(s):  
V.E. Arkhipov ◽  
T.I. Murav’eva ◽  
M.S. Pugachev ◽  
I.V. Shkaley
Keyword(s):  
Deposition Temperature ◽  
Mass Fraction ◽  
Structural Phase ◽  
X Ray Diffraction ◽  
Technological Parameters ◽  
X Ray ◽  
Type Compound ◽  
Gas Dynamic ◽  
Ε Phase ◽  
Overlap Coefficient

The results of effect of deposition temperature and the overlap coefficient on the formation of the phase composition of coating based on Cu, Zn and Al2O3 particles mixture applied by cold gas-dynamic deposition are presented. Using X-ray diffraction and X-ray spectral analysis, it is shown that when using the 55 % overlap coefficient electron-type compound based on CuZn3 (ε-phase) is formed in the coating, the mass fraction of which increases to 11.4 % with increase in the deposition temperature. Deposition with 64 % overlap coefficient is accompanied by the formation not only of the ε-phase, but of electron-type compound based on Cu5Zn8 (γ-phase), the mass fraction of which increases to 33 % at temperature of 450 °C. In the process of coating deposition, the predominant diffusion copper into zinc takes place; the calculations show high value of the diffusion coefficient copper — 1,56•10–13 m2 /s.

scholarly journals Structural and optical study of the phase transitions in Lead Hafnate, PbHfO3

2014 ◽  
Vol 70 (a1) ◽  
pp. C58-C58
Author(s):  
Steven Huband ◽  
Anthony Glazer ◽  
Krystian Roleder ◽  
Andrzej Majchrowski ◽  
Pam Thomas
Keyword(s):  
Phase Transitions ◽  
Structural Phase ◽  
Orthorhombic Phase ◽  
Temperature Hysteresis ◽  
Structural Phase Transitions ◽  
X Ray Diffraction ◽  
Space Group ◽  
X Ray ◽  
Fundamental Understanding ◽  
Distinct Temperature

Lead Hafnate undergoes two structural phase transitions as a function of temperature. The first occurs at about 1630C, consisting of a transition from an antiferroelectric orthorhombic Pbam structure [1] to another antiferroelectric orthorhombic phase with an as-yet undetermined space group. The second is to a paraelectric cubic Pm3m structure at 2090C. Dielectric spectroscopy measurements on a single crystal have shown a distinct temperature hysteresis at the orthorhombic to orthorhombic transition [2]. Recently, dielectric measurements on a ceramic sample have shown a much larger temperature hysteresis and following x-ray diffraction measurements, it is suggested that the second orthorhombic phase is in space group A2mm and undergoes another transition to a tetragonal P4mm structure before the cubic transition [3]. We report on the results of an investigation of a PbHfO3crystal using a combination of high-resolution x-ray diffraction and birefringence imaging measurements with the Metripol system. These measurements have been performed as a function of temperature from the room-temperature orthorhombic structure to the high-temperature cubic structure. The results are discussed both in the context of the published work and fundamental understanding of the origin of antiferroelectricity.

X-ray diffraction and Raman study of DL-alanine at high pressure: revision of phase transitions

2012 ◽  
Vol 68 (4) ◽  
pp. 412-423 ◽  
Author(s):  
Nikolay A. Tumanov ◽  
Elena V. Boldyreva
Keyword(s):  
Phase Transition ◽  
Phase Transitions ◽  
Structural Phase ◽  
Group Symmetry ◽  
Second Phase ◽  
Structural Phase Transitions ◽  
X Ray Diffraction ◽  
X Ray ◽  
Cell Parameters ◽  
Raman Study

The effect of pressure on DL-alanine has been studied by X-ray powder diffraction (up to 8.3 GPa), single-crystal X-ray diffraction and Raman spectroscopy (up to ∼ 6 GPa). No structural phase transitions have been observed. At ∼ 1.5–2 GPa, cell parameters b and c become accidentally equal to each other, but the space-group symmetry does not change. There is no phase transition between 1.7 and 2.3 GPa, contrary to what has been reported earlier [Belo et al. (2010). Vibr. Spectrosc. 54, 107–111]. The presence of the second phase transition, which was claimed to appear within the pressure range from 6.0 to 7.3 GPa (Belo et al., 2010), is also argued. The changes in the Raman spectra have been shown to be continuous in all the pressure ranges studied.

Synthesis and Comparison of Boron Nitride Nanostructure Prepared on Silicon and Molybdenum Substrates by Laser Plasma Deposition Technique

2011 ◽  
Vol 1307 ◽  
Author(s):  
M. Sajjad ◽  
H. X. Zhang ◽  
P. X. Feng
Keyword(s):  
Electron Microscopy ◽  
Boron Nitride ◽  
Plasma Deposition ◽  
Nitrogen Concentration ◽  
Deposition Technique ◽  
X Ray Diffraction ◽  
Experimental Conditions ◽  
X Ray ◽  
Si Substrates ◽  
Scanning Electron

ABSTRACTThe synthesis of boron nitride nanowires on silicon (Si) and nanorods on molybdenum (Mo) substrates at the same experimental conditions was composed. Fine tip nanowires with diameters around 50 nm were produced on Si substrates, whereas, nanorods with diameter around 100 nm were formed on Mo substrates. The change in length from 5 μm to 100 μm for nanowires and 0.2 μm to 0.8μm for nanorods following variation of substrate temperature were studied systematically.Scanning Electron Microscopy was used to analyze the surface images of BN nanowires and nanorods. Energy Dispersive X-Ray spectroscopy (EDS) was used to analyze boron and nitrogen concentration in the samples. The crystal structures of BN samples were investigated using Raman spectroscopy and x-ray diffraction. The experimental results showed that the nanorods are hexagonal mixed with cubic, whereas the nanowires are hexagonal.

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