Wear Resistance of Amorphous-Crystalline Coatings with Lubricants

Babak, Vitalii; Щепетов, В. В.

doi:10.3103/s1068366618010038

Cited by 17 publications

(11 citation statements)

References 5 publications

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“…Visualization of volumetric data was carried out using the VESTA program [9]. The algorithm for modeling of the electronic structure was used according to the work [10]. Topological analysis and interpretation of DOS and ELF were performed within the framework of Bader's theory [11].…”

Section: Methodsmentioning

confidence: 99%

Investigation of thermoelectric material based on Lu1-xZrxNiSb solid solution. II. Modeling of characteristics

Ромака

Stadnyk

Romaka

et al. 2022

Phys. Chem. Solid St.

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The KKR (AkaiKKR software package) and FLAPW (Elk software package) methods were used to model the structural, thermodynamic, energetic, and electrokinetic characteristics of the Lu1-xZrxNiSb semiconductor solid solution. It is shown that defects of acceptor nature are present in the structure of LuNiSb as a result of vacancies in positions 4a and 4c of Lu and Ni atoms, respectively, which generates two acceptor levels eAVac 4a and eAVac 4c in the band gap εg. When Zr atoms are introduced into the LuNiSb structure by replacing Lu atoms in position 4a, Zr atoms also occupy vacancies in this position, which increases the lattice parameter a(x) and eliminates defects of acceptor nature and corresponding acceptor levels eAVac 4a. When the vacancies are filled, Lu atoms are displaced, which reduces the value of the unit cell parameter and generates defects of donor nature and donor levels eD4a. The Ni atoms return to position 4c, which increases the a(x) value and eliminates defects of acceptor nature and the corresponding acceptor levels eAVac 4c. At the lowest concentration of Zr atoms, the conduction type of Lu1-xZrxNiSb changes from p- to n-type. The simulation results are consistent with experimental studies of Lu1-xZrxNiSb.

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Section: Methodsmentioning

confidence: 99%

Investigation of thermoelectric material based on Lu1-xZrxNiSb solid solution. II. Modeling of characteristics

Ромака

Stadnyk

Romaka

et al. 2022

Phys. Chem. Solid St.

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show abstract

“…Measurement of electrical resistivity was carried out using the two-probe method, and the thermopower coefficient was measured by the potentiometric method with pure copper as reference material. To reduce "parasitic" effects caused by the influence of thermopower in place of contact and the effects caused by the possible impact of a p-n junction, the measurement of the voltage drop on the sample performed at different directions of electric current [10]. Measurements of the values of the specific magnetic susceptibility χ of Lu1-xZrxNiSb samples were performed by the relative Faraday method at 293 K using a thermogravimetric instrument with an electronic microbalance in magnetic fields up to 10 kOe.…”

Section: Methodsmentioning

confidence: 99%

“…Romaka, Yu. Stadnyk, L. Romaka, А. Horyn, V. Pashkevich, H. Nychyporuk, P. Garanyuk electrons are captured by the acceptors available in the semiconductor [10].…”

Section: Study Of Electrokinetic Energetic and Magnetic Characteristi...mentioning

confidence: 99%

Investigation of thermoelectric material based on Lu1-xZrxNiSb solid solution. I. Experimental results

Ромака

Stadnyk

Romaka

et al. 2022

Phys. Chem. Solid St.

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The effect of doping of half-Heusler phase p-LuNiSb (MgAgAs structure type) by Zr atoms on the structural, kinetic, energetic and magnetic characteristics of the semiconductor solid solution Lu1-xZrxNiSb was studied in the ranges: T = 80–400 K, x = 0–0.10. From experimental studies it has been established that doping of p-LuNiSb compound with Zr atoms simultaneously generates both structural defects of acceptor and donor nature, the concentration of which increases with increasing content of Zr atoms. It was shown that the investigated semiconductor solid solution Lu1-xZrxNiSb is a promising thermoelectric material.

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“…With a profound understanding and precise quantification of these coefficients, designers and engineers can engage in intricate analyses and simulations that simulate the thermal behavior of the building under various conditions. This comprehensive comprehension empowers them to make informed decisions regarding insulation materials, heating and cooling systems, and energy efficiency measures 2–5 …”

Section: Introductionmentioning

confidence: 99%

Comparison of experimental and calculated thermal transmittance for timber‐framed outer wall constructions

Gendelis

2023

Heat Trans

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The importance of accurately determining the thermal transmittance factor for the outer walls of timber‐framed buildings is the driving force behind this research. This calculation is necessary for heating and cooling load determination, as well as energy consumption assessment. This research aims to conduct an analytical comparison, through both experimental and calculated means, of thermal conductivity coefficients of materials employed in the construction of buildings and structures. The methodological approach adopted in this research is grounded on an experimental analysis of the thermal transmittance of the outer wall materials in timber‐framed buildings. Thermal conductivity measurements with a Hot Plate apparatus by ISO 8302 and thermal conductivity calculations using mathematical software were the primary experimental methods deployed during the research. The results of this study demonstrate differences between experimental and calculated thermal transmittance values for timber‐framed outer walls. Moisture inconsistent distribution throughout the material is the reason behind these discrepancies, calling for particular humidity corrections in the calculations, varying across different materials. While working with simplified calculations of timber‐framed outer wall structures, monitoring the uneven heat flow in I‐beam joints is paramount and should be coupled with humidity‐related material changes. This study's practical implications are that the results can be implemented when calculating the energy consumption of building structures and the heating‐cooling load they entail.

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Wear Resistance of Amorphous-Crystalline Coatings with Lubricants

Cited by 17 publications

References 5 publications

Investigation of thermoelectric material based on Lu1-xZrxNiSb solid solution. II. Modeling of characteristics

Investigation of thermoelectric material based on Lu1-xZrxNiSb solid solution. II. Modeling of characteristics

Investigation of thermoelectric material based on Lu1-xZrxNiSb solid solution. I. Experimental results

Comparison of experimental and calculated thermal transmittance for timber‐framed outer wall constructions

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