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Methods of controlling the porosity in the sintered structures have been investigated.
Porous structures with a pore size around 100 µm were produced.
Porous structures with a pore size around 100 µm were produced.
Porous structures with a pore size about 100 µm were produced.
IR measurement was carried out at BU, Department of Chemistry.

In addition, DNA molecules are easier to construct more complicated structures, even some of which are able to move.
When excited by other lights, this structure can maintain the stable state for several seconds.
However, these methods are difficult to discriminate tiny structures directly.
The TEM images of the AuNPs groups showed several kinds of assembly structures in the sample solution.
Lu, Y: Analytical Chemistry, Vol. 76 (2004), p. 1627-1632.

The refinement of grain structure should be primarily attributed to the restriction of grain growth by the limited cellular space formed in the skeleton of the fiber preform structure instead of the nucleation of primary a-Mg phase directly on Al2O3 fibers.
The matrix alloy was magnesium alloy AM60 with the chemistry composition (wt.%) of 6.0Al-0.22Zn-0.4Mn-0.1Si-0.01Cu-0.004Fe-0.002Ni-Mg due to its wide usage in the automotive industry.
The structure of the fibre preform itself is critical in determining the eventual structure of the magnesium composites since liquid magnesium alloy infiltrated into the preform under an applied pressure during casting.
Obviously, the supercooling of magnesium alloys can be correlated to their grain structure.
As a result, small or no supercooling appears on the cooling curve as the fine grained structure is achieved.

The local structure analysis of PbS is done by the pair distribution function (PDF).
PbS belongs to the family of lead chalcogenides and crystallizes in cubic (rocksalt) structure.
The studied sample was subjected to X-ray diffraction in finding the structure.
Local structure analysis of PbS using PDF shows long range ordering in the material.
B5, 3144, (1972) [20] K.Suresh Babu, C.Vijayan, R.Devanathan, in: Elsevier B.V,(2003) [21] Won young Lee, Rok Lee, Robert Sinclair, Fritz B Prinz, in: Nanotechnology, Vol21, (2010) [22] Yu Zhao, Xue-Hong Liao, Jian-Min Hong, Jun-Jie Zhu, in: Materials Chemistry and Physics, Vol87, pp 149-153, (2004).

Cuevas2,e 1Advanced Materials Engineering Group, Escuela Técnica Superior de Ingeniería, Universidad de Sevilla, 41092 Sevilla, Spain 2Department of Chemical Engineering, Physical Chemistry and Materials Science, Escuela Técnica Superior de Ingeniería, Universidad de Huelva, 21071 Huelva, Spain apurban@us.es, bfternero@us.es, crosamaria.aranda@dqcm.uhu.es, drastacio@us.es efgcuevas@dqcm.uhu.es Keywords: amorphization; crystallization; titanium; aluminium; nickel; mechanical alloying Abstract.
Laser diffraction, Scanning Electron Microscopy (SEM), X-ray Diffraction (XRD), Transmission Electron Microscopy (TEM) and Differential Scanning Calorimetry (DSC) were employed to characterize the particle size, morphology and structure of mechanically alloyed Ti50Al30Ni20 alloy.
The structure, amorphization and crystallization progress of the ball milled powders were characterized by X-ray diffraction (XRD, Siemens D500) using CuKα radiation, scanning electron microscopy (SEM, Philips XL 30) and transmission electron microscopy (TEM, Philips CM-200).
Cuevas, Structure and Size Distribution of Powders Produced from Melt-Spun Fe-Si-B Ribbons, Key Engineering Materials. 876 (2021) 25-30, 10.4028/www.scientific.net/KEM.876.25 [6] P.

Laboratory heats were made achieving target chemistries and cast into 100 mm square cross-sectioned ingots.
In all, six laboratory heats were made and target chemistries were effectively achieved in three heats i.e. one Ni-free and two low-Ni heats.
Incidentally, compared to the low-Ni duplex stainless steels, the Ni-free DSS was observed to exhibit more equiaxed grain structure.
Charles, Super duplex stainless steels: structure and properties, Proc.
Charles, Structure and mechanical properties of duplex stainless steels, Proc. 4th Int.

Barium titanate (BTO) is lead-free and eco-friendly ceramic material with perovskite structure[1].
The morphology, structure and humidity sensitivity were investigated at room temperature.
It is evident that only diffraction peaks of BTO are observed without other peaks due to secondary phases, indicating the nanofibers were polycrystalline perovskite structure.
To investigate the surface structure of the nanofibers, SEM was performed on the samples.
However, we emphasize the material structures suitable for humidity sensor.

Crystalline structure of 518 phase has high strength, which leads to high strength of the chloride-oxy-magnesium concrete products .With the increase of molar ratio of MgO and MgCl2, too much hydration of free MgO in MgO-MgCl2-H2O system lead to the solution PH value increase, and then accelerate the dissolution of 518 phase, and compact crystal structure is destroyed, resulting in the decrease strength of the products[5].
And other studies show that in the equilibrium phase diagram of MgO-MgCl2-H2O system, the crystalline structure of 518 phase has higher strength.
The n(MgO)/n(MgCl2) determines the crystal structure of chloride-oxy-magnesium concrete, and then influences the properties of magnesium concrete-based straw board.
[8] Tooper B,Cartz L.Structure and Formation of Magnesium Oxychloride Sorel Cements.
[9] Matkovic B,Rogic V.A Modified Magnesia Concrete.The sixth international conference of concrete chemistry papers volume second.Beijing:China Building Industry Press, 1982:172-185.

The optimized structure acquired with minimum total energy attributes to the Monkhorst-Pack (MP) [25,26] grid of size 5 x 5 x 8.
The behavior of the converged total energy versus cutoff energy for the relaxed structure is illustrated in Fig. 1.
From band structure data, it is found that rutile TiO2 is a direct bandgap material consistent with [17].
Rohrer, Structure and Bonding in Crystalline Materials, Cambridge University Press, 2001
Lide, CRC Handbook of Chemistry and Physics, CRC Press, 2012

Nano-sized powders of Co2Z hexagonal ferrite (Ba3Co2Fe24O41) with planar structure were prepared by citrate sol-gel process and processed at different temperatures to study phase evolution process.
Introduction Ferrimagnetic oxides having a crystal structure similar to that of magnetoplumbite mineral are referred to as the hexagonal ferrites.
There are several other hexagonal compounds with more complex structures and Z-type hexaferrite is the most complex compound of the family: its unit cell contains 140 atoms and its space group is P63/mmc [1 ].
Unlike preparation of pure BaFe12O19 by citrate precursor method, the Z-type phase powder can not be produced so easily due to the complexity of its structure, which imposes progressive transformations through intermediate ferrites before one achieving the final required structure.
Zhou: Materials Chemistry and Physics Vol. 77 (2002), pp. 248-253