Search results

The grain size(D) was calculated using Debye-Scherrer formula.
It was found that the average grain size increases, when the molar concentration increases.
It may be observed that there are three orientations identified as (100),(002) and (101) planes at diffraction angles 31.79◦, 34.48◦, 36.30◦ for the samples with molarities from 0.025M to 0.075M.The number of peaks increases for 0.1M concentration.
The films grown at 0.05M had hexagonal grains.
The grain boundary density increases with increasing Zinc concentration [21].

As it is shown in the histogram of the size distribution of grains (figures 5) average grain size of both alloys is 80 nanometers.
The nanometer-sized clusters differ from the bulk alloy in that the nanostructured clusters have a larger numbers of interface atoms (including atoms on grain boundaries), especially while cluster size is small.
The overwhelming amount of interface atoms, incomplete in atom bonds, leads to less regular atom configurations bearing a lower number of the nearest-neighbor atoms, which make the Curie temperature Tc decrease.
The increasing of the MCE values during decreasing values in grain size can be also explained by suppression of local magnetocrystalline anisotropy which is associated with each individual grain.
Müller K H and Schultz L, Evolution of interaction domains in textured fine-grained Nd2Fe14B magnets. 2007 J.

A large number of plant fossils, Danaeopsis fecunda, Bernoullia zeilleri, et al, are late Triassic common molecule, in which all plant fossils are members of Yanchang flora.
Large number of plant fossils indicates the subaerial sedimentary environments, such as river, swamp, et al.
Gray-green, dark green thin-bedded fine-grained lithic feldspathic greywacke 1.53m 3.
Gray-green thick-bedded with thin-bedded fine-mindium grained lithic feldspathic greywacke 7.39m 1.
Rounded mineral grains with rough surface show the river-dominated depositional environment.

Grain boundary diffusion of Fe in high-purity copper Jens Ribbe, Guido Schmitz, S.
Divinskia Institute of Materials Physics, University of Münster, Wilhelm-Klemm-Str. 10, 48149 Münster, Germany a divin @ uni-muenster.de Keywords: copper; grain boundary diffusion; grain boundary segregation; molecular dynamics simulation.
Grain boundary (GB) diffusion of 59Fe in high purity polycrystalline copper was measured using the radiotracer technique and precision parallel sectioning in an extended temperature interval.
However, there exist generally a number of additional factors (e.g.
Gust: Fundamentals of Grain and Interface Boundary Diffusion, (Wiley \& Sons LTD, Chichester, New York, 1995)

Coarse-graining molecular dynamics simulations were carried out for deformation and fracture problems in polycarbonate.
Methodology Coarse-Grained Particle Model.
Table 2 lists molar mass, the number of molecules and the number of CG particles in each simulation cell.
The number of molecules in each smaller simulation cell was adjusted in order that the total number of PC monomers (the number of CG particles) was close nearly identical among the simulation cells.
Fig. 5: Stress-strain relationships obtained with various number-average molar masses.

As a rule, the electrolyte with porous silver paste electrodes is equivalent to a circuit of three RQ elements in series corresponding to grain, grain boundary, material/electrode contribution.
Therefore, the impedance spectrum usually shows two or three arcs, and the higher, medium, lower frequency arcs represent the grain impedance, the grain boundary impedance and electrode polarization effect, respectively [13, 14].
The total resistance R is the resistance sum of the grain and the grain boundary.
The average ionic transport number in the given oxygen pressure range can be obtained by EMF method [6].
The oxide-ionic transport numbers drop a little under the p(O2) gradient of 0.21 atm/1× 10−5 atm, and the minimum oxygen ion transport number 0.983 is observed at 1,023 K.

It is good for the future production of grain refinement we need.
The grain sizes of this two group samples are shown in Figure 1.
A B C D E F 30 40 50 60 70 80 90 100 Grain Size um Specimen Fig.1 Sample average grain radius Figure 1 shows the grain sizes of the first group samples are greater than that the second group samples.
Refinement effect with atomic number ratio of is stronger than that with atomic number ratio of .
When the atomic number ratio is , TiB2 and ZrB2 generate.

However, annealing process at 500oC displayed a smaller number of this phase and lower in hardness scale [4].
The grain boundaries number which was intercepted by measuring line were counted and ASTM grain size number would be achieved by the following equation PL = PLTM (1) G=[-6.6457 log⁡(1PL) ]-3.298 (2) Other specimen will also be tested in X-Ray Diffraction machine to obtain the phases which were present after annealing process.
The number of twinning in a microstructure is also inversely proportional to the grain size.
A high ASTM grain size number indicates a finer grain size (smaller grain size) which mean annealing process will enlarge the grain size but minimize the grain size number that can be seen in the Figure 1.b [8, 9, & 12].
The hardness number of the specimens are dropped significantly from 400oC annealing temperature to 500oC which indicate the recrystalization process was occurred and new grains were formed during this stage.

The addition of trace amounts of nano-HA decreases the grain size of the matrix refined and increases the number of grain boundaries, hindering the motion of dislocations and leading to an improved tensile strength of the composites.
First, fine grain structure increases the number of slips during plastic deformation so that the deformation is evenly dispersed in many more grains.
Secondly, a number of twists of the grain boundary surface increases with decreasing grain size, making the spreading of micro cracks less favorable.
Furthermore, since at high temperatures, the number of slip planes of Mg matrix increases from one to three and impurity atoms are gradually dissolved in the matrix [17], the number of grain boundary impurities and grain boundary viscosity sliding resistance decrease.
Additionally, higher HA content leads to reduction of the grain size and an increase in the number of grain boundaries.

Preparation of Porous LSM/YSZ Composite with Varying Grain Size of YSZ Precursor Using Solid State Reaction Method Romar Angelo M.
In order to increase the TPB sites in the SOEC, the number of voids which would allow the infiltration and exchange of gas should also be increased.
The use of a pore former decreases the conductivity of an electrode but in theory, a less-dense anode will perform in terms of reaction kinetics because of the increase in the number of active sites for electrolysis [1].
The nanoYSZ precursor grains cause a higher density which resulted to a possible higher total conductivity.
Conclusion The effect of YSZ precursor grain size and the presence of graphite pore former on the properties of LSM/YSZ were investigated.