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Online since: December 2005
Authors: D.K. Chaturvedi, Graeme E. Murch, Irina V. Belova, K.L. Gosain
Many
intermetallic compounds that are attractive for technological applications take the B2 (CsCl)
structure.
Accordingly, much effort has been devoted to exploring diffusion kinetics in this particular structure.
The detailed mechanism of diffusion in B2 intermetallic compounds is much more complex because of the ordered structure itself and because of the additional energy involved in any mechanism that would destroy order, even if only temporarily.
For an isolated 6JC, the jump frequency for the structured atom is (1/48) of this average frequency [8-10].
Sato, Physical Chemistry: An Advanced Treatise, Vol. 10, edited by H.
Accordingly, much effort has been devoted to exploring diffusion kinetics in this particular structure.
The detailed mechanism of diffusion in B2 intermetallic compounds is much more complex because of the ordered structure itself and because of the additional energy involved in any mechanism that would destroy order, even if only temporarily.
For an isolated 6JC, the jump frequency for the structured atom is (1/48) of this average frequency [8-10].
Sato, Physical Chemistry: An Advanced Treatise, Vol. 10, edited by H.
Online since: January 2019
Authors: Shao Yu Qiu, Jing Jing Liao, Jun Qiu, Zhong Bo Yang, Zhu Qing Cheng, Hong Liu, Zong Pei Wu, Bo Gao
Nb has a body-centered cubic structure and is a kind of β-phase stable elements which forms a continuous solid solution with βZr in Zr-Nb binary phase diagram, and at the segregation temperature (~600℃), the solid solubility of Nb in αZr is 0. 29 wt% ~ 0. 49 wt% [7].
The morphology, crystal structure and composition of the SPPs were observed by JEM-200CX transmission electron microscope (TEM) and equipped energy dispersion spectrum (EDS).
In comparison with the tubes final annealed at 480 ℃, the number of dislocations in the grains annealed at 510 ℃ was reduced, and the grains began to transform from the fiber structure during rolling to the equiaxed recrystallized structure, but since the recrystallization was not sufficient, elongated grains along the rolling direction were remained.
Prasath, et al., An X-ray absorption near-edge structure (XANES) study of the Sn L3edge in zirconium alloy oxide films formed during autoclave corrosion, Corros.
Andrén, Barrier oxide chemistry and hydrogen pick-up mechanisms in zirconium alloys, Corros.
The morphology, crystal structure and composition of the SPPs were observed by JEM-200CX transmission electron microscope (TEM) and equipped energy dispersion spectrum (EDS).
In comparison with the tubes final annealed at 480 ℃, the number of dislocations in the grains annealed at 510 ℃ was reduced, and the grains began to transform from the fiber structure during rolling to the equiaxed recrystallized structure, but since the recrystallization was not sufficient, elongated grains along the rolling direction were remained.
Prasath, et al., An X-ray absorption near-edge structure (XANES) study of the Sn L3edge in zirconium alloy oxide films formed during autoclave corrosion, Corros.
Andrén, Barrier oxide chemistry and hydrogen pick-up mechanisms in zirconium alloys, Corros.
Online since: July 2020
Authors: Enea Bianda, Elena Mengotti, Stephan Wirths, David Baumann, Jason Bettega, Joni Jormanainen
Traditional planar gates structures have been used since the introduction of SiC, and since 2015, trench technology has been emerging, bringing the advantage of a reduced RDSON per area unit.
However, the trench design results in high electric fields especially close to the channel regions, which require shielding structures.
SEM cross section of the planar and trench devices gate structure.
Cross section SEM along with Energy Dispersive X-Ray Spectroscopy element analysis of the gate structure of investigated MOSFETs showed that for both P and T the gate oxide material is SiO2.
Kimura, "Oxide breakdown mechanism and quantum physical chemistry for time-dependent dielectric breakdown," IRPS 1997, pp. 190-200
However, the trench design results in high electric fields especially close to the channel regions, which require shielding structures.
SEM cross section of the planar and trench devices gate structure.
Cross section SEM along with Energy Dispersive X-Ray Spectroscopy element analysis of the gate structure of investigated MOSFETs showed that for both P and T the gate oxide material is SiO2.
Kimura, "Oxide breakdown mechanism and quantum physical chemistry for time-dependent dielectric breakdown," IRPS 1997, pp. 190-200
Online since: March 2024
Authors: Juniastel Rajagukguk, Pintor Simamora, Chayani S. Sarumaha, Jonny Haratua Panggabean, Jakrapong Kaewkhao
The objective is to achieve a high-quality medium that excels in terms of structure, mechanics, and optics.
Once the proportional size and shape of the glass medium have been obtained, the subsequent task is to ascertain the physical attributes and structure of the glass medium.
The structure of CeF3 doped with aluminium fluorophosphate glasses is evident in Fig. 3.
Sarumaha, Structure and emission properties of Nd3+ doped oxyfluorophosphate glasses, in: J.
Journal of Applied Chemistry, 22(5), 275-289
Once the proportional size and shape of the glass medium have been obtained, the subsequent task is to ascertain the physical attributes and structure of the glass medium.
The structure of CeF3 doped with aluminium fluorophosphate glasses is evident in Fig. 3.
Sarumaha, Structure and emission properties of Nd3+ doped oxyfluorophosphate glasses, in: J.
Journal of Applied Chemistry, 22(5), 275-289
Online since: June 2018
Authors: Oleksandr Shustov, Andrii Adamchuk, Olena Hladun, Oleksandr Bielov
The Dnieper brown coal basin is located within Ukrainian shield, which occupies a central position in the structure of the South-Western part of the Eastern European platform.
The coal-bearing strata of Dnieper deposits contains from 1 to 2 – 3 horizontally lying coal beds of a simple and, more rarely, complex structure.
This refers to production of montan wax or as it is called in coal chemistry “bitumen or bituminous” as well as salts of humic acids.
“Semenovskiy Mining Wax Plant” (SMWP) was constructed according to the project of the Zapadshakhtproekt Institute on the basis of dismantled equipment of the plant of “Riebeck'schen Montanwerke AG” firm (Germany) and put into operation in 1959 as a production facility for production of montan wax in a structure of “Semenovsk-Golovkovskiy” (later “Dimitrovskiy”) briquette factory.
Other experiments carried out in the laboratory of the Institute of Coal and Coal Chemistry of Siberian Branch of Academy of Sciences (SB RAS) of Russian Federation in 2006, under the condition of modification of brown coal with aliphatic alcohols in the presence of a catalyzer, allowed the reach the yield of “raw” montan wax up to the level of 30.8% on organic mass of coal.
The coal-bearing strata of Dnieper deposits contains from 1 to 2 – 3 horizontally lying coal beds of a simple and, more rarely, complex structure.
This refers to production of montan wax or as it is called in coal chemistry “bitumen or bituminous” as well as salts of humic acids.
“Semenovskiy Mining Wax Plant” (SMWP) was constructed according to the project of the Zapadshakhtproekt Institute on the basis of dismantled equipment of the plant of “Riebeck'schen Montanwerke AG” firm (Germany) and put into operation in 1959 as a production facility for production of montan wax in a structure of “Semenovsk-Golovkovskiy” (later “Dimitrovskiy”) briquette factory.
Other experiments carried out in the laboratory of the Institute of Coal and Coal Chemistry of Siberian Branch of Academy of Sciences (SB RAS) of Russian Federation in 2006, under the condition of modification of brown coal with aliphatic alcohols in the presence of a catalyzer, allowed the reach the yield of “raw” montan wax up to the level of 30.8% on organic mass of coal.
Online since: June 2020
Authors: Janis Locs, Marika Mosina
Synthesis of Amorphous Calcium Phosphate: A Review
Marika Mosina1,a* and Janis Locs1,b
1Rudolfs Cimdins Riga Biomaterials Innovations and Development Centre of RTU, Institute of General Chemical Engineering, Faculty of Materials Science and Applied Chemistry, Riga Technical University, Pulka 3, Riga, Latvia, LV-1007
amarika.mosina@rtu.lv, bjanis.locs@rtu.lv
Keywords: amorphous calcium phosphate, synthesis, biomaterials.
ACP is metastable, and an ACP X-ray diffraction (XRD) pattern (Fig. 1) has a wide bump around 30° 2θ characteristic of an amorphous structure with short-range order [2,3,6-8].
Above pH 10.5 ACP surface structure becomes similar to apatite structure and that leads to nucleation of crystals [3,17,18].
Betts, Synthetic Amorphous Calcium Phosphate and Its Relation to Bone Mineral Structure, Acc.
Locs, Amorphous calcium phosphate materials: Formation, structure and thermal behaviour, J.
ACP is metastable, and an ACP X-ray diffraction (XRD) pattern (Fig. 1) has a wide bump around 30° 2θ characteristic of an amorphous structure with short-range order [2,3,6-8].
Above pH 10.5 ACP surface structure becomes similar to apatite structure and that leads to nucleation of crystals [3,17,18].
Betts, Synthetic Amorphous Calcium Phosphate and Its Relation to Bone Mineral Structure, Acc.
Locs, Amorphous calcium phosphate materials: Formation, structure and thermal behaviour, J.
Online since: August 2013
Authors: Xin Su, Yi Luo
The BSRs observed in slop basin generally disappear or become very weak in synclinal structures.
From the ODP 204 data, the primary BSR was interpreted as the base of GHSZ which composed by structure Ⅰ hydrate.
The second BSR would be the base of the GHSZ of structure Ⅱ Hydrate.
In principle, the gas hydrate typically contain small hydrocarbons (methane, nature gas or CH4) in structure Ⅰ.
The heavier hydrocarbons formed the structure Ⅱ and H gas hydrates[1,2].
From the ODP 204 data, the primary BSR was interpreted as the base of GHSZ which composed by structure Ⅰ hydrate.
The second BSR would be the base of the GHSZ of structure Ⅱ Hydrate.
In principle, the gas hydrate typically contain small hydrocarbons (methane, nature gas or CH4) in structure Ⅰ.
The heavier hydrocarbons formed the structure Ⅱ and H gas hydrates[1,2].
Online since: August 2022
Authors: Melati Khairuddean, Bazri Izwan Bakar, Mohammad Murwih Alidmat, Tutik Dwi Wahyuningsih
The X-ray crystal structure of ERα was downloaded from the RCSB database (PDB ID: 3ERT).
The 2D chemical structure of the ligands was built using PerkinElmer ChemDraw software 16.0 (Perkin Elmer).
Chemical structures were saved in MOL2 format and then converted to PDB files.
The structure of hybrid chalcone 1 and hybrid pyridine 2 was characterized by IR spectra.
The more p bonds in anthracene gives more resonance structures and more delocalization, making the compounds more stable.
The 2D chemical structure of the ligands was built using PerkinElmer ChemDraw software 16.0 (Perkin Elmer).
Chemical structures were saved in MOL2 format and then converted to PDB files.
The structure of hybrid chalcone 1 and hybrid pyridine 2 was characterized by IR spectra.
The more p bonds in anthracene gives more resonance structures and more delocalization, making the compounds more stable.
Online since: April 2022
Authors: Oluseyi O. Ajayi, Olufunmilayo Oluwabukola Joseph, Philip Babalola, Sunday Olayinka Oyedepo, Michael Ajibero, K.M. Oluwasegun, Nduka E. Udoye, Joseph O. Dirisu, Ojo Sunday Isaac Fayomi
It is not constructive; it is just a protective crust that hides the details of the structure above [21-22].
It may vary across materials, and specific material structures and thicknesses are needed to ensure strength indicators [29].
The structure of a construction material depends on its production technology and can achieve parallel structures by using this technology [36].
The microstructural dimension of the materials is defined in terms of the size, form of the grain, and structure.
Chemistry-Sustainibility-Energy-Materials, 5(4), 694-699
It may vary across materials, and specific material structures and thicknesses are needed to ensure strength indicators [29].
The structure of a construction material depends on its production technology and can achieve parallel structures by using this technology [36].
The microstructural dimension of the materials is defined in terms of the size, form of the grain, and structure.
Chemistry-Sustainibility-Energy-Materials, 5(4), 694-699
Online since: October 2022
Authors: Harini Sosiati, Yofentina Iriani, Yusmaniar Yusmaniar, Izon Suhandra, Muhammad Ramadhan, F.A. Kusuma Yuda
This trend has impacted the fiber structure formed on the nanofiber membranes (Fig. 3 and Fig. 4).
The fiber structure of neat PVA demonstrates defect-free continuous fibers (Fig. 3a and Fig. 4a).
The chosen membrane composition is consistent with an optimum result of the previous study [11], based on the fiber structure and the number of formed porosity.
It indicates that the pore size will be smaller with the membrane thickness due to the non-woven fibrous structure.
Ding, Tortuously structured polyvinyl chloride/polyurethane fibrous membranes for high-efficiency fine particulate filtration, J.
The fiber structure of neat PVA demonstrates defect-free continuous fibers (Fig. 3a and Fig. 4a).
The chosen membrane composition is consistent with an optimum result of the previous study [11], based on the fiber structure and the number of formed porosity.
It indicates that the pore size will be smaller with the membrane thickness due to the non-woven fibrous structure.
Ding, Tortuously structured polyvinyl chloride/polyurethane fibrous membranes for high-efficiency fine particulate filtration, J.