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Online since: February 2014
Authors: Erik Janzén, Ádám Gali, Krisztian Szasz, Viktor Ivády
Gali1,4,d *
1Institute for Solid State Physics and Optics, Wigner Research Centre for Physics of the Hungarian Academy of Sciences, Hungary
2Institute of Physics, Loránd Eötvös University, Hungary
3Department of Physics, Chemistry and Biology, Linköping University, Sweden
4Department of Atomic Physics, Budapest University of Technology and Economics, Hungary
aszasz.krisztian@wigner.mta.hu, bivady.viktor@gmail.com, cerija@ifm.liu.se dgali.adam@wigner.mta.hu
Keywords: hyperfine coupling, zero-field splitting, photoluminescence, optically detected magnetic resonance, solid state quantum bit
Abstract.
We calculated the hyperfine structure and the zero-field splitting parameters of divacancies in 3C, 4H and 6H SiC in the ground state and in the excited state for 4H SiC within the framework of density functional theory.
Thus, hyperfine (hf) coupling and zero-field splitting (zfs) of high-spin paramagnetic point defects are key quantities in quantum information processing applications, and they are also fingerprints to identify yet unknown defect structures.
If experimental data on hf were known, it would help to identify the microscopic structure of the measured signals.
By comparison of the measured hf values of the divacancy for 4H SiC with our results, we could predict the hf structure of the divacancy in 3C and 6H SiC.
We calculated the hyperfine structure and the zero-field splitting parameters of divacancies in 3C, 4H and 6H SiC in the ground state and in the excited state for 4H SiC within the framework of density functional theory.
Thus, hyperfine (hf) coupling and zero-field splitting (zfs) of high-spin paramagnetic point defects are key quantities in quantum information processing applications, and they are also fingerprints to identify yet unknown defect structures.
If experimental data on hf were known, it would help to identify the microscopic structure of the measured signals.
By comparison of the measured hf values of the divacancy for 4H SiC with our results, we could predict the hf structure of the divacancy in 3C and 6H SiC.
Online since: October 2011
Authors: Ali Umar Akrajas, Sri Nengsih, Muhamad Mat Salleh
The nanorod seems to be perfect rod morphology instead of bone-like or tear drop structure.
Introduction Synthesis of controlled shape and size of gold nanoparticles have become a central issue in the nanomaterial chemistry field due to their unique dependence of properties on size and shape at this length scale [1].
Among the available shape nanorod received a considerable attention as their unique one dimensional structure and distinguish optical, electronic and catalytic properties.
Meanwhile, other band that centers at 640 nm could be the band associated with the other direction of the plasmon resonance due to the presence of possible anomaly of the structure, such as inconsistency in the diameter of the nanorod (for example nanobone, tear drop and other).
As has been discussed earlier, the presence of only two SPR peaks implied that the formation of the nanostructure might be a perfect rod-shape structure.
Introduction Synthesis of controlled shape and size of gold nanoparticles have become a central issue in the nanomaterial chemistry field due to their unique dependence of properties on size and shape at this length scale [1].
Among the available shape nanorod received a considerable attention as their unique one dimensional structure and distinguish optical, electronic and catalytic properties.
Meanwhile, other band that centers at 640 nm could be the band associated with the other direction of the plasmon resonance due to the presence of possible anomaly of the structure, such as inconsistency in the diameter of the nanorod (for example nanobone, tear drop and other).
As has been discussed earlier, the presence of only two SPR peaks implied that the formation of the nanostructure might be a perfect rod-shape structure.
Online since: July 2016
Authors: Robert Jasionowski, Dariusz Zasada, Wojciech Polkowski
Cavitation Wear of CuZn10 Alloy in As-Cast State
and After Plastic Working and Annealing
Robert JASIONOWSKI1,a*, Wojciech POLKOWSKI2,b and Dariusz ZASADA2,c
1 Maritime University of Szczecin, Mechanical Faculty, Institute of Basic Technical Sciences,
51-53 Podgórna Street, 70-205 Szczecin, Poland
2 Military University of Technology, Faculty of Advanced Technology and Chemistry,
2 Kaliskiego Street, 00-908 Warsaw, Poland
a r.jasionowski@am.szczecin.pl, b wojciech.polkowski@wat.edu.pl, c dzasada@wat.edu.pl
Keywords: cavitation, cavitation wear, CuZn10 alloy, plastic working, recrystallization annealing
Abstract.
The course of cavitation destruction depends mainly on a material structure (grain size, type of inclusions, morphology and phase distribution, etc.) but also on the load distribution, and a possible activity of chemical, electrochemical and thermal processes near cavitation bubbles.
Properties of a material subjected to the cavitation damage are strongly affected by its structure resulting from manufacturing or applied processing.
Generally, in the field of metallic materials both the structure state (grain size, crystallographic texture etc.) and metallurgical quality exhibit the greatest impact on their cavitational erosion resistance [10-12].
Results and discussion The investigated material has single-phase structure of α solid solution of zinc in copper.
The course of cavitation destruction depends mainly on a material structure (grain size, type of inclusions, morphology and phase distribution, etc.) but also on the load distribution, and a possible activity of chemical, electrochemical and thermal processes near cavitation bubbles.
Properties of a material subjected to the cavitation damage are strongly affected by its structure resulting from manufacturing or applied processing.
Generally, in the field of metallic materials both the structure state (grain size, crystallographic texture etc.) and metallurgical quality exhibit the greatest impact on their cavitational erosion resistance [10-12].
Results and discussion The investigated material has single-phase structure of α solid solution of zinc in copper.
Online since: June 2010
Authors: Iskandar Idris Yaacob, Yusrini Marita
X-ray
diffraction measurements confirmed that all nickel-iron alloy films formed have face-centered cubic
structure.
Thin film nanocrystalline structures offer a new opportunity to improve current magnetic materials.
All the reflection patterns for these samples indicate that the films are having face-centered cubic (FCC) structure.
The crystal structures of the prepared Ni-Fe thin films were FCC.
Chemistry and Phys Vol. 107 (2008), p. 289 [9] S.
Thin film nanocrystalline structures offer a new opportunity to improve current magnetic materials.
All the reflection patterns for these samples indicate that the films are having face-centered cubic (FCC) structure.
The crystal structures of the prepared Ni-Fe thin films were FCC.
Chemistry and Phys Vol. 107 (2008), p. 289 [9] S.
Online since: December 2011
Authors: Jin Yong Xu, Ya Juan Liu, Yan Tang, Fang Yong Ye, Cheng Gao, Jing Chun Zhang
At the beginning of 2 minutes friction course, wear rate decrease soon that is related to ceramic coating structure.
After 2 minutes, friction object is compact layer which has a compact structure with hardness about 1500 HV.
Ceramic coatings treated by different kind of process have different roughness and island structure of deposit.
Compact layer contains amount of α-Al2O3 superhard phase so that compact structure can prevent the breaking off of ceramic micro particle.
Zhao, et al: Materials Chemistry and Physics, Vol. 97 (2006), p. 132
After 2 minutes, friction object is compact layer which has a compact structure with hardness about 1500 HV.
Ceramic coatings treated by different kind of process have different roughness and island structure of deposit.
Compact layer contains amount of α-Al2O3 superhard phase so that compact structure can prevent the breaking off of ceramic micro particle.
Zhao, et al: Materials Chemistry and Physics, Vol. 97 (2006), p. 132
Online since: October 2014
Authors: Mark Cassidy, John Irvine, Julie Nairn, Paul Connor, Marielle Etches, Yann Kalecheff, Marina MacHado
Thick Film Processing Challenges in the Realisation of a Co-Fired Solid Oxide Fuel Cell Roll
Mark Cassidy1, a *, Paul Connor 1, Marielle Etches1, Yann Kalecheff1,
Marina MacHado1, Julie Nairn1 and John Irvine1
1University of St Andrews, School of Chemistry, St Andrews, UK
amc91@st-andrews.ac.uk
*corresponding author
Keywords: Solid Oxide Fuel Cell, SOFC, SOFCRoll, Thick Film, Tape Casting, Screen Printing, Cofiring, Portable Power, CHP, Processing
Abstract
The Solid Oxide Fuel Cell Roll (SOFCRoll) is a novel design based on a double spiral.
To optimise layer thickness to function, thinner screen printed layers were combined into the tape cast structure in 2nd generation cells.
a b Figure 6; 2nd generation cross sections showing (a) a montage image of the overall SOFCRoll structure and (b) a close up of the active cell region with the electrolyte in the centre and the cathode layers to the top.
This burnt out to leave the channel structure shown in Figure 7b.
a b Figure 9 (a); Separation at zirconia electrolyte lamination interface (b) triple cast zirconia multi-layered structure.
To optimise layer thickness to function, thinner screen printed layers were combined into the tape cast structure in 2nd generation cells.
a b Figure 6; 2nd generation cross sections showing (a) a montage image of the overall SOFCRoll structure and (b) a close up of the active cell region with the electrolyte in the centre and the cathode layers to the top.
This burnt out to leave the channel structure shown in Figure 7b.
a b Figure 9 (a); Separation at zirconia electrolyte lamination interface (b) triple cast zirconia multi-layered structure.
Online since: July 2020
Authors: Yi Si, D.S. Kevluzov
Research on the Long-Lasting and Remelting Properties of Nd Modification Effect on Cast Al-Mg2Si Metal Matrix Composite
Yi Si1,a and Kevluzov D.S.2
1Department of Applied Chemistry, Liaoning Petrochemical Vocational and Technology College, Jinzhou, China
2Department of Materials Science, Urgench State University, Urgench City, Uzbekistan
ayisi67218917@126.com
Keywords: Nd modification, Al-Mg2Si, long-lasting and remelting properties.
After the composite is modified for 300 min and remelted by 6 times, its primary and eutectic Mg2Si structures are still in modification state of small block and slices, and the tensile properties of the composite are not significantly affected.
The effect of rare earth Nd on the structure and properties of the composite at different time of modification and different times of remelting was studied, and the long-term and remelting properties of Nd modification were explored.
After prolonging the modification time to 60min, the primary Mg2Si structure were unchanged, and was still in a small massive modification state; however, compared with the structure of holding for 10min, the eutectic Mg2Si grain became smaller, and the morphology mostly changed from flake to short fiber or particle, as shown in Figure1(c).
When the modification time was extended to 300min, some of the primary Mg2Si grow up slightly, but it was still distributed on the eutectic structure matrix evenly, and it was the refined state after modification, while most of the eutectic Mg2Si grains still kept fine fibrous and granular, as shown in Fig.1(d).
After the composite is modified for 300 min and remelted by 6 times, its primary and eutectic Mg2Si structures are still in modification state of small block and slices, and the tensile properties of the composite are not significantly affected.
The effect of rare earth Nd on the structure and properties of the composite at different time of modification and different times of remelting was studied, and the long-term and remelting properties of Nd modification were explored.
After prolonging the modification time to 60min, the primary Mg2Si structure were unchanged, and was still in a small massive modification state; however, compared with the structure of holding for 10min, the eutectic Mg2Si grain became smaller, and the morphology mostly changed from flake to short fiber or particle, as shown in Figure1(c).
When the modification time was extended to 300min, some of the primary Mg2Si grow up slightly, but it was still distributed on the eutectic structure matrix evenly, and it was the refined state after modification, while most of the eutectic Mg2Si grains still kept fine fibrous and granular, as shown in Fig.1(d).
Online since: February 2014
Authors: Tsugio Sato, Shu Yin, Ima Rachmah Nisa, Anung Riapanitra, Ponco Iswanto, Uyi Sulaeman
The body-centered cubic structure of silver orthophosphate with 1-10 μm in diameter was successfully synthesized.
However, the doping technique resulted in the defects in structure which suppresses the photocatalytic activities due to increase in the recombination rate of photo-induced electron-hole pair formation [5].
The crystal structure of Ag3PO4 was characterized using XRD (x-ray diffractometer).
The body-centered cubic structure of Ag3PO4 (JCPDS no. 06-0505) was successfully synthesized [6,7].
Summary The body-centered cubic structure of Ag3PO4 with 1-10 μm in diameter could be successfully synthesized.
However, the doping technique resulted in the defects in structure which suppresses the photocatalytic activities due to increase in the recombination rate of photo-induced electron-hole pair formation [5].
The crystal structure of Ag3PO4 was characterized using XRD (x-ray diffractometer).
The body-centered cubic structure of Ag3PO4 (JCPDS no. 06-0505) was successfully synthesized [6,7].
Summary The body-centered cubic structure of Ag3PO4 with 1-10 μm in diameter could be successfully synthesized.
Online since: August 2014
Authors: Zulkifli Mohd Rosli, Muhamad Azizi Mat Yajid, Zulhelmi Alif Abdul Halim, Riyaz Ahmad M. Ali
With minimal microstrain influence, each layer shows different morphologies between the columnar and non columnar structure.
Both Al and Cu layer shows {111} preferred orientation, which has lowest surface energy for f.c.c crystal structure.
The Al layer consists of dense structure which appears to be similar to the (Zone T) structure of the Thornton structure zone model [10].
The electron images reveal that Cu layer has shown a columnar structure while Al layer demonstrate a non columnar - dense structure.
Material Chemistry and Physics 43 (1996) 145-152.
Both Al and Cu layer shows {111} preferred orientation, which has lowest surface energy for f.c.c crystal structure.
The Al layer consists of dense structure which appears to be similar to the (Zone T) structure of the Thornton structure zone model [10].
The electron images reveal that Cu layer has shown a columnar structure while Al layer demonstrate a non columnar - dense structure.
Material Chemistry and Physics 43 (1996) 145-152.
Online since: September 2013
Authors: Anucha Wannagon, W. Thiemsorn, P. Laoarun, K. Pawanawichian
The IGF had cellular structure with the macro-pore size at 0.428 mm and thin cell walls.
The foam structure obtained and still existed for sintering at 700 °C and 725 °C.
Pore size Fig. 1 is the cellular structures of the four IGF samples.
Compressive strength Generally, compressive strength is reasonably correlated with density and cellular structure of the foamed materials.
Colombo (Eds.), Cellular Ceramics: Structure, Manufacturing, Properties and Applications, WILEY-VCH, Weinheim, 2005, pp. 158-176
The foam structure obtained and still existed for sintering at 700 °C and 725 °C.
Pore size Fig. 1 is the cellular structures of the four IGF samples.
Compressive strength Generally, compressive strength is reasonably correlated with density and cellular structure of the foamed materials.
Colombo (Eds.), Cellular Ceramics: Structure, Manufacturing, Properties and Applications, WILEY-VCH, Weinheim, 2005, pp. 158-176