scholarly journals Structural Properties and Crystallization Behavior of FINEMET Fe74Cu1.5Nb2.5Si12B10 Alloy Under Different Annealing Condition

2016 ◽  
Vol 64 (1) ◽  
pp. 71-75 ◽  
Author(s):  
Enayet Hossain ◽  
Shamima Choudhury ◽  
DK Saha ◽  
MA Hakim
Keyword(s):  
Grain Size ◽  
Structural Properties ◽  
Annealing Time ◽  
Crystallization Temperature ◽  
Crystallization Behavior ◽  
Annealing Temperature ◽  
Primary Crystallization ◽  
Lattice Parameter ◽  
Annealing Condition ◽  
Si Content

The effect of annealing condition on nanocrystalline amorphous FINEMET type of alloy with nominal composition Fe74Cu1.5Nb2.5Si12B10 prepared by rapid solidification method has been studied to observe the structural properties and crystallization behavior of the material. Nanocrystalline alloy with ferromagnetic bcc nanocrystals with size 15-29 nm embedded in a residual amorphous matrix was produced from amorphous precursor by appropriate annealing condition. The amorphosity of the material, primary crystallization temperature, the nanometric grain size, Si content and the lattice parameter of Fe(Si) nano-phase have been determined from XRD patterns of the samples annealed at different temperatures ranging from 475°C - 650°C with annealing time 5, 12, 20 and 30 minutes. The annealing temperature 475°C (with annealing time of 12 minutes) was determined as primary crystallization temperature with grain size 15 nm, Si content 16.25 at.% and lattice parameter 2.8431 Å. The grains were found to grow rapidly after 550°C attaining a maximum value of 29 nm at the annealing temperature of 650°C. The grain size and Si content increase whereas the lattice parameter decreases with the increase of annealing temperature and time.Dhaka Univ. J. Sci. 64(1): 71-75, 2016 (January)

scholarly journals Impact of Annealing Time on the Formation of Nanocrystal in Amorphous FE75.5SI13.5CU1NB1B9 Alloy and their Ultra-Soft Magnetic Properties

2016 ◽  
Vol 40 (2) ◽  
pp. 137-145
Author(s):  
Samir Kumar Saha ◽  
Kazi Hanium Maria ◽  
Enayet Hossain ◽  
Mahabub Alam Bhuiyan ◽  
DK Saha ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Annealing Time ◽  
Annealing Temperature ◽  
Lattice Parameter ◽  
Soft Magnetic Properties ◽  
Content Increase ◽  
Soft Magnetic ◽  
Nanocrystalline State ◽  
Si Content ◽  
The Impact

To observe the impact of the annealing time on the alloy structure and ultra-soft magnetic properties of Fe75.5Si13.5Cu1Nb1B9, the alloy was annealed in a controlled way in the temperature range 475 - 600°C for different annealing time from 5 to 30 min. Amorphosity of the ribbon and nanocrystalline state was evaluated by X-ray diffraction. Grain size and Si content increase with increasing annealing temperature and time; on the other hand lattice parameter decrease with increasing annealing temperature and time. The maximum permeability was observed at annealing temperature Ta = 525°C for 15 min, and thereafter it starts to decreases. Saturation magnetization increases with annealing temperature Ta for the samples and finally decreases during annealing at a temperature much higher than peak crystallization temperature. The results of the experimental observations are explained on the basis of existing theories of nanocrystalline amorphous metallic ribbons.Journal of Bangladesh Academy of Sciences, Vol. 40, No. 2, 137-145, 2016

scholarly journals Study the Structural Properties and Surface Morphology of CdO Thin Films Prepared by Chemical Spray pyrolysis

2020 ◽  
Vol 12 (02) ◽  
pp. 1-11
Author(s):  
Karrar Mahdi Saleh ◽  
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Grain Size ◽  
Structural Properties ◽  
Annealing Time ◽  
Annealing Temperature ◽  
Crystal Defects ◽  
Average Grain Size ◽  
Chemical Spray ◽  
Cdo Thin Films

CdO films were prepared using a chemical spray paralysis (CSP) method on the glass substrate at a temperature of 350 ° C and thickness (260 ± 15 nm), and study the effect annealing time (0, 1, 1.5, 2, 2.5) h at annealing temperature 450 °C on structural properties. The X-ray diffraction pattern the results showed that all CdO thin films have a polycrystalline structure and a prevalent growth in the direction (111), and the average grain size (G) in this direction ranges (29.80 - 33.23) nm. It generally increases in value while the agitation values, extraction density, number of crystals decrease by increasing the annealing time (0-2)h at annealing temperature 450 ° C of thin films. From the resulted of the atomic force microscope (AFM), the surface roughness, medium square root (RMS) and average grain size increase with the increasing of the annealing time (0-2) h, at annealing temperature 450 ° C. The thin film with annealing time 2.5 h at annealing temperature 450 °C . We note a slight decrease in the values of the coefficients ( XRD and AFM) Due to the changes in the crystal structure of thin films and beginning of cracks and crystal defects generated on the surface of the thin film during the annealing process. It has been observed in practice that the increase in the annealing time to 3 h at annealing temperature 450 ° C. led to the separation of the thin film from the substrates.

Structural Analysis of Rf Sputtered Er Doped Ta2O5 Films

2010 ◽  
Vol 459 ◽  
pp. 32-37 ◽  
Author(s):  
Jaspal Parganram Bange ◽  
Mayank Kumar Singh ◽  
Kazusa Kano ◽  
Kenta Miura ◽  
Osamu Hanaizumi
Keyword(s):  
Thin Films ◽  
Structural Analysis ◽  
Structural Properties ◽  
Annealing Time ◽  
Annealing Temperature ◽  
Hexagonal Phase ◽  
Rf Sputtering ◽  
Amorphous Nature ◽  
Crystalline Nature ◽  
Er Doped

Thin films of Er-doped Ta2O5 have been synthesized by RF sputtering. The influence of annealing temperature, number of Er tablets and annealing time on the structural properties of grown films, has been studied. The samples annealed bellow 800°C show amorphous nature. However, the sample annealed at 800°C and above shows crystalline nature of the film with β–Ta2O5 (orthorhombic) and δ–Ta2O5 (hexagonal) phase. The crystalline structure of the film is disturbed with the increase in Er concentration.

Effects of Processing Technic on Grain Size of Copper Clad Steel Wire

2012 ◽  
Vol 567 ◽  
pp. 116-122 ◽  
Author(s):  
Qing Mei Wu ◽  
De Qing Wang ◽  
Yang Gao
Keyword(s):  
Grain Size ◽  
Cross Section ◽  
Annealing Time ◽  
Annealing Temperature ◽  
Steel Wire ◽  
Annealing Treatment ◽  
Longitudinal Section ◽  
Diameter Ratio ◽  
Strip Shape ◽  
Clad Steel

The method adopted to manufacture copper clad steel wire in this study is cladding and welding and then drawing and annealing it. The effect of drawing deformation and annealing treatment on the grain size of α-Fe phase were studied. Experimental results show that the grain sizeα in cross section of α-Fe phase is decreased with the increase of the drawing deformation. Grains of the longitudinal section are elongated toward the drawing direction and appeared a strip shape. The grain size in cross-section of α-Fe phase is enhanced with the increase of the annealing time and annealing temperature, its length diameter ratio in longitudinal section is decreased oppositely. The grain size in cross section and length diameter ratio in longitudinal section are almost invariant in 850 °C for 2 h, the grain in longitudinal section tends to be equiaxial, the recrystallization processes is thus finished at this moment. Through the experimental data analysis, the regression equation about the relation of annealing temperature and annealing time of CCS with the grain size in cross section and length diameter ratio in longitudinal section are obtained.

Synergistic Effect of K2O and Al2O3 on the Crystallization and Structure of Na2O-CaO-SiO2-MgO-Al2O3-ZnO of Glass-Ceramics

2015 ◽  
Vol 655 ◽  
pp. 234-239
Author(s):  
Jian Wei Cao ◽  
Zhi Wang
Keyword(s):  
Grain Size ◽  
Synergistic Effect ◽  
Crystalline Phase ◽  
Crystallization Temperature ◽  
Crystallization Behavior ◽  
Raw Materials ◽  
Glass Ceramics ◽  
Melt Quenching ◽  
Main Crystalline Phase

The Na2O-CaO-SiO2-MgO-Al2O3-ZnO glass-ceramics was prepared from the phosphorus slag as main primary raw materials by melt quenching technique. The effects of K2O and Al2O3 on crystallization behavior and structure of glass-ceramics were investigated by DSC, XRD and SEM. It is shown that the main crystalline phase is combeite (Na4Ca4(Si6O18)) in glass-ceramics. K2O and Al2O3 do not change the main crystalline phase of glass-ceramics, but K2O increases the crystallization temperature, Al2O3 increases the crystallization temperature, obviously decreases the grain size. The K2O isometric replaces Na2O at the same time the Al2O3 isometric to replace SiO2, reduced the grain size.

The Effect of Final Annealing Heating Rate on Abnormal Grain Growth in a Fe-3.5%Si Steel

2016 ◽  
Vol 879 ◽  
pp. 350-355
Author(s):  
Fatayalkadri Citrawati ◽  
Md Zakaria Quadir ◽  
Paul Munroe
Keyword(s):  
Grain Size ◽  
Heating Rate ◽  
Grain Growth ◽  
Growth Kinetics ◽  
Annealing Time ◽  
Annealing Temperature ◽  
Rapid Heating ◽  
Secondary Recrystallization ◽  
Recrystallization Annealing ◽  
Final Annealing

In this study the effects of heating rate on the sharpness and size of Goss oriented ({110}<001>) grains during secondary recrystallization annealing at 900 °C was observed. The results show that, at the same annealing temperature, rapid heating of the samples to this temperature generates a higher drag force compared to a slower heating rate (5°C/min). The two groups of samples show different growth kinetics for Goss grains, in which at the longest annealing time, the rapid heating sample exhibits larger maximum Goss grain size compared to the slower heated samples.

Study on nanocrystalline grain size and quantitative change in Fe–Cu–Mo–Si–B soft magnetic alloy

2021 ◽  
Author(s):  
Jong Su Kim ◽  
Tong Son Yom ◽  
Myong Hak Kim
Keyword(s):  
Grain Size ◽  
Annealing Temperature ◽  
Volume Fraction ◽  
Initial Permeability ◽  
Nanocrystalline Phase ◽  
Magnetic Alloy ◽  
Soft Magnetic ◽  
Soft Magnetic Alloy ◽  
Ultrafine Structure ◽  
Si Content

In this paper, we studied the grain size and volume fraction change of [Formula: see text]-Fe(Si) nanocrystalline phase as a function of Cu, Mo and Si content in Fe[Formula: see text]Cu[Formula: see text]Mo3Si[Formula: see text]B9, Fe[Formula: see text]Cu1Mo[Formula: see text]Si[Formula: see text]B9, Fe[Formula: see text]Cu1Mo3Si[Formula: see text]B[Formula: see text], and also the annealing temperature and time in Fe[Formula: see text]Cu1Mo3Si[Formula: see text]B9 alloy. Cu is an element promoting ultrafine structure and crystallization progresses, it causes the grain size of the [Formula: see text]-Fe(Si) phase to decrease suddenly, the volume fraction of [Formula: see text]-Fe(Si) phase to increase only by adding 0.5 at.% Cu. Also, Mo causes the grain size of [Formula: see text]-Fe(Si) phase to decrease like Cu, while suppressing the increase of the volume fraction of [Formula: see text]-Fe(Si) phase, Si has no little effect on the grain size of [Formula: see text]-Fe(Si) phase, diffuses into the inner part of [Formula: see text]-Fe(Si) phase upto Si 13.5 at.%, but suddenly increases grain size above Si 13.5 at.%. The microstructure of Fe[Formula: see text]Cu1Mo3Si[Formula: see text]B9 alloy is nearly completed at 520[Formula: see text]C for about 20 min, the grain size is approximately 13.8–14.1 nm, the volume fraction of [Formula: see text]-Fe(Si) phase is within 61–66%, initial permeability at 1 kHz is within 59,800–61,100.

Effect of Nd2O3 Addition on Crystallization Behavior of Li2O–Al2O3–SiO2 Glass-Ceramics

2014 ◽  
Vol 1030-1032 ◽  
pp. 56-60
Author(s):  
Cheng Li ◽  
Wen Qi He ◽  
Xu Yang Zhang ◽  
Hong Jiang ◽  
Chang Jiu Li ◽  
...  
Keyword(s):  
Phase Transition ◽  
Solid Solution ◽  
Grain Size ◽  
Crystallization Temperature ◽  
Crystallization Behavior ◽  
Glass Ceramics ◽  
Crystal Phase ◽  
Glass Crystallization ◽  
Melting Method

Li2O-Al2O3-SiO2 glass-ceramics doped with Nd2O3 were prepared by the melting method. The effects of Nd2O3 on the crystallization behavior of Li2O-Al2O3-SiO2 glass-ceramics were studied by DTA, XRD and SEM. With the increase of Nd2O3 content, the glass crystallization temperature arised. The SEM result indicates that the main crystal phase of Li2O-Al2O3-SiO2 glass-ceramics doped with Nd2O3 is β-quartz solid solution, for without doping Nd2O3 it is β-spodumene solid solution. These results shows that the crystallization temperature increases significantly by doping Nd2O3, and phase transition from β-quartz to β-spodumene is suppressed. The grain size increases with the increase of Nd2O3 content.

Effect of Annealing on Magnetic Properties and Domain Structures of FePt Thin Films by Rapid Thermal Annealing Technique

2009 ◽  
Vol 79-82 ◽  
pp. 911-914
Author(s):  
S.C. Chen ◽  
T.H. Sun ◽  
Po Cheng Kuo
Keyword(s):  
Grain Size ◽  
Magnetic Properties ◽  
Heating Rate ◽  
Domain Structure ◽  
Rapid Thermal Annealing ◽  
Annealing Time ◽  
Annealing Temperature ◽  
High Heating Rate ◽  
Fept Film ◽  
High Heating

Single-layered FePt films of 30 nm thick were annealed at temperature between 300 and 800 °C for 1–180 sec by a rapid thermal annealing (RTA) with a high heating rate of 100 °C/sec. It is found that both the grain size and magnetic domain size of the FePt film increase with increasing annealing temperature and annealing time. The FePt films exhibited soft magnetic properties and without domain images were observed by magnetic force microscope (MFM) when the films were post-annealed at below 500 °C for 180 sec. The in-plane coercivity (Hc//) and perpendicular coercivity (Hc⊥) of FePt film increases significantly to 7.5 and 6.5 kOe respectively as annealing temperature increases to 600 °C. When the annealing temperature is increased to 700 °C, they are increased to 11.1 and 9.5 kOe, respectively, and the domain structure inclines to isolated domain. However, further increasing the annealing temperature to 800 °C, the Hc// and Hc⊥ values decrease to 9.8 and 8.9 kOe respectively due to largely increase the grain size of FePt and change the domain structure from isolation to continuity. On the other hand, in order to transform the FePt film from disordered γ phase to the ordered L10 phase, the annealing time of over 3 seconds is necessary when the film was post-annealed at 700 °C with a high heating rate of 100 °C/sec by RTA technique.

scholarly journals Effect of Heat Treatment on Structural and Magnetic Properties of Li-Ni Ferrite Prepared via Sol-Gel Auto-Combustion Method

2021 ◽  
Author(s):  
Jiali Song ◽  
Zhi Wang ◽  
Yu Gao
Keyword(s):  
Grain Size ◽  
Magnetic Properties ◽  
Annealing Temperature ◽  
Sol Gel ◽  
Combustion Method ◽  
Lattice Parameter ◽  
X Ray Diffraction ◽  
X Ray ◽  
Auto Combustion ◽  
Ft Ir

Abstract Nanocrystalline Li 0.35 Ni 0.3 Fe 2.35 O 4 ferrites were prepared at different annealing temperature by sol-gel auto-combustion method. The effects of the annealing temperature on the structure and magnetic properties of the synthesized Li-Ni ferrites were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectra (FT-IR) and Squid-VSM. Rietveld refinement of the X-ray diffraction data confirmed the occurrence of phase transition from α-spinel to β-spinel, from which the ideal cation occupation and lattice parameter can be obtained. The grain size increased significantly with annealing temperature. The variation of saturation magnetization can be well explained in terms of the occupation of ions in tetrahedron and octahedron. The coercivity initially increased and later decreased significantly from 115 to 37 Oe with the increase of annealed temperature which could be attributed the fact that the 600℃-annealed grain size is close to transition size from single to multidomain region.

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