Influence of sintering temperature on structural, morphological and magnetic properties of barium hexaferrite nanoparticles

2016 ◽  
Vol 30 (19) ◽  
pp. 1650254 ◽  
Author(s):  
M. Burhan Shafqat ◽  
Omer Arif ◽  
Shahid Atiq ◽  
Murtaza Saleem ◽  
Shahid M. Ramay ◽  
...  
Keyword(s):  
Saturation Magnetization ◽  
Data Storage ◽  
Single Phase ◽  
Sintering Temperature ◽  
Sol Gel ◽  
Barium Hexaferrite ◽  
X Ray Diffraction ◽  
Hexagonal Crystal ◽  
Phase Synthesis ◽  
Auto Combustion

Barium hexaferrite nanoparticles are attractive for modern data storage and microwave devices due to their unique properties. Single phase synthesis of barium hexaferrite using sol–gel auto-combustion route was optimized by varying sintering temperature and time. X-ray diffraction confirmed single phase hexagonal crystal structure of the sample sintered at 1100[Formula: see text]C for 2 h. Crystallite size, as determined using Scherrer’s formula, was increased with the increase in sintering temperature while the porosity remained nearly unchanged. Field emission scanning electron microscope (FE-SEM) revealed that grain size was increased from nanometers to micrometers by rising the sintering temperature and the shape of particles was platelet-like hexagonal at 900[Formula: see text]C. Vibrating sample magnetometer (VSM) exhibited that saturation magnetization and coercivity increased with the increase of sintering temperature. Maximum saturation magnetization and coercivity values were 36.80 emu/g and 5365 Oe, respectively, for the sample sintered at 1100[Formula: see text]C for 2 h.

scholarly journals Magnetic properties of Cu and Al doped nano BaFe12O19 ceramics

2020 ◽  
Vol 10 (3) ◽  
pp. 5455-5459
Keyword(s):  
Saturation Magnetization ◽  
Single Phase ◽  
Sol Gel ◽  
Hexagonal Structure ◽  
Magnetic Characteristics ◽  
X Ray Diffraction ◽  
Cu Substitution ◽  
Auto Combustion ◽  
Diffraction Patterns ◽  
Combustion Technique

The BaCuxFe12-xO19 and BaAlxFe12-xO19 (x = 0.0, 0.4, 0.8, 1.2) materials were prepared via sol-gel auto combustion technique. Further, the X-ray diffraction patterns suggested the formation of single phase hexagonal structure. This work is aimed to study the effect of diamagnetic and paramagnetic elements on magnetic characteristics of BaFe12O19. The results established that in the case of diamagnetic (Cu) substitution, the saturation magnetization was increased and decreased alternatively. Furthermore, it was noticed that the coercivity values of all doped samples were lower than those of undoped samples. But the replacement of Fe3+ with paramagnetic (Al) element led to a decrease in saturation magnetization and to a significant increase in the coercive field.

scholarly journals Structural and Magnetic Property of Cr3+ Substituted Cobalt Ferrite Nanomaterials Prepared by the Sol-Gel Method

Materials ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 2095 ◽  
Author(s):  
Jinpei Lin ◽  
Jiaqi Zhang ◽  
Hao Sun ◽  
Qing Lin ◽  
Zeping Guo ◽  
...  
Keyword(s):  
Saturation Magnetization ◽  
Sol Gel ◽  
Combustion Method ◽  
Lattice Parameter ◽  
Cubic Phase ◽  
Cobalt Chromium ◽  
X Ray Diffraction ◽  
Chromium Doping ◽  
Auto Combustion ◽  
Cr Concentration

Cobalt-chromium ferrite, CoCrxFe2−xO4 (x = 0–1.2), has been synthesized by the sol-gel auto-combustion method. X-ray diffraction (XRD) indicates that samples calcined at 800 °C for 3 h were a single-cubic phase. The lattice parameter decreased with increasing Cr concentration. Scanning electron microscopy (SEM) confirmed that the sample powders were nanoparticles. It was confirmed from the room temperature Mössbauer spectra that transition from the ferrimagnetic state to the superparamagnetic state occurred with the doping of chromium. Both the saturation magnetization and the coercivity decreased with the chromium doping. With a higher annealing temperature, the saturation magnetization increased and the coercivity increased initially and then decreased for CoCr0.2Fe1.8O4.

scholarly journals Magnetic and Structural Properties of Barium Hexaferrite Nanoparticles Doped with Titanium

Symmetry ◽  
2019 ◽  
Vol 11 (6) ◽  
pp. 732 ◽  
Author(s):  
Abdul Raouf Al Dairy ◽  
Lina A. Al-Hmoud ◽  
Heba A. Khatatbeh
Keyword(s):  
Saturation Magnetization ◽  
Permanent Magnets ◽  
Sol Gel ◽  
Hysteresis Loops ◽  
Barium Hexaferrite ◽  
Titanium Concentration ◽  
Recording Equipment ◽  
Auto Combustion ◽  
Xrd Patterns ◽  
Combustion Technique

Samples of Barium Hexaferrite doped with Titanium BaFe12−xTixO19 with (x = 0.0, 0.2, 0.4, 0.6, 0.8, 1.0) were synthesized by the sol–gel auto-combustion technique. The powdered samples were divided into two parts, one sintered at 850 °C and another sintered 1000 °C for 1 h and samples were characterized by different experimental techniques. The XRD patterns confirmed the presence of M-type hexaferrite phase. The sizes of the crystallites were calculated by the Scherer equation, and the sizes were in the range of 27–42 nm. Using the hysteresis loops, the saturation magnetization Ms, remanence (Mr), the relative ratio (Mr/Ms), and the coercivity (Hc) were calculated. The study showed that the saturation magnetization (Ms) and remanence (Mr) decreased with increasing titanium concentration and were in the range from 44.65–17.17 emu/g and 23.1–7.7 emu/g, respectively. The coercivity (Hc) ranged between 0.583 and 4.51 (kOe). The magnetic properties of these Barium Hexaferrite doped with Titanium indicated that they could be used in the recording equipment and permanent magnets.

scholarly journals SYNTHESIS OF NANOPARTICLE BARIUM HEX AFERRITE BY SOL GEL AUTO COMBUTIO

2012 ◽  
Vol 12 (2) ◽  
pp. 156 ◽  
Author(s):  
WIDYASTUTI WIDYASTUTI ◽  
FELLY YULIAN FF ◽  
ROCHMAN R ◽  
HARIYATI PURWANINGSIH
Keyword(s):  
Sintering Temperature ◽  
Sol Gel ◽  
Barium Hexaferrite ◽  
Combustion Method ◽  
Gel Point ◽  
Ferric Nitrate ◽  
Aqueous Mixtures ◽  
Air Atmosphere ◽  
Auto Combustion ◽  
Different Temperatures

Nanocrystalline of Barium Hexaferrite (BaFe12O19) powders have been synthesized using the sol gel auto combustion method. The ferrite precursors were obtained from aqueous mixtures of Barium nitrate and Ferric nitrate by auto combustion reaction from gel point. These precursors were sintered at different temperatures ranging from 700 to 1000oC for constant calcinations time 2,5 h in a static air atmosphere. Effects of Fe3+/Ba2+ mol ratios and sintering temperatures on the microstructure and magnetic properties were systematically studied. The powders formed were investigated using X-ray diffraction (XRD), scanning electron microscope (SEM) and VSM. The results obtained showed that the phase BaFe12O19 powders were achieved by the Fe3+/Ba2+ mole ratio from the stoichiometric value 11, 11.5 and 12 at temperature950OC. With increasing of temperature sintering, coercivity and magnetization value tends to rising. The maximum saturation magnetization (66.16 emu/g) was achieved at the Fe3+/Ba2+mole ratio to 11.5 and the sintering temperature 950OC. The maximum coercivity value 3542 Oe achieved at mole ratio sample 12 with sintering temperature 950OC. Maximum saturation 6616 emu/g achieved at mole ratio sample 115 with the same temperature.

Study of Sol-Gel Auto-Combustion Method Prepare Ni0.6-xZn0.4MgxFe2O4

2012 ◽  
Vol 463-464 ◽  
pp. 1052-1056
Author(s):  
Ai Xiang Zeng ◽  
Jun Yuan
Keyword(s):  
Crystal Structure ◽  
Zinc Ferrite ◽  
Single Phase ◽  
Sol Gel ◽  
Combustion Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Nickel Zinc ◽  
Auto Combustion ◽  
Scanning Electron

Ni0.6-xZn0.4MgxFe2O4were synthesized by sol-gel auto-combustion method with Zn(NO3.) 2 •6H2O. , Ni(NO3.) )2•6H2O. , Mg(NO3.) )2•6H2O. , Fe(NO3.) )3•9H2O. , COOO2. and NH3•H2O. X-ray diffraction (XRD) analysises show that the sample is single phase and the doping of magnesium makes no difference to nickel-zinc ferrite’s crystal structure; nickel-zinc ferrite has formed after auto-combustion. Scanning electron microscope analysises show that after sintered the sample’s size is more even and the doping of magnesium makes the size smaller and more even too.

Structural and Dielectric Studies of Cu Substituted Barium Hexaferrite Prepared by Sol-Gel Auto Combustion Technique

2013 ◽  
Vol 209 ◽  
pp. 102-106 ◽  
Author(s):  
Ganapathi Packiaraj ◽  
Nital R. Panchal ◽  
Rajshree B. Jotania
Keyword(s):  
Room Temperature ◽  
Single Phase ◽  
Initial Level ◽  
Sol Gel ◽  
Barium Hexaferrite ◽  
Combustion Method ◽  
Auto Combustion ◽  
Combustion Technique ◽  
Substituted Barium Hexaferrite ◽  
Copper Substitution

In the present study, a series of Cu substituted M type Barium hexagonal ferrite BaCuxFe12-xO19 (x = 0.0, 0.2, 0.4, 0.6, 0.8, 1.0) has been synthesized using a Sol- gel auto combustion method. The aim of the present work was to investigate the effects of Cu/Fe ratio on the crystallography and dielectric properties. The XRD studies reveal a formation of the single phase BaFe12O19 at the initial level and mixed phase of S, M and Y hexaferrite at the higher level of copper substitution. The dielectric measurements were carried out at room temperature in a frequency range of 20 Hz to 2MHz. the dielectric constant is found to decrease with the increase of frequency for all the compositions.

Microstructure and Magnetic Properties of Barium Hexaferrite Produced by Sol Gel Auto Combustion for Radar Absorber Material (RAM) Application

2014 ◽  
Vol 493 ◽  
pp. 656-660 ◽  
Author(s):  
Widyastuti ◽  
Endah Kharismawati ◽  
M. Zainuri ◽  
Hosta Ardhyananta
Keyword(s):  
Magnetic Properties ◽  
High Performance ◽  
Sol Gel ◽  
Barium Hexaferrite ◽  
Hexagonal Structure ◽  
X Ray Diffraction ◽  
Absorber Material ◽  
Auto Combustion ◽  
Stirring Time ◽  
Microstructure And Magnetic Properties

Barium hexaferrite (BaFe12O19) with hexagonal structure has been known as the high performance magnetic for Radar Absorber Material (RAM). Barium hexaferrite (BaM) was synthesized by sol gel auto combustion to get an homogeneous nanoparticle of BaM. Barium hexaferrites obtained from solution mixture between barium nitrate and ferri nitrate nonahidrat with precipitation of ion barium (Ba2 +) and ferri (Fe3 +) by solution of sodium hydroxide. Sample prepared with mol ratio of Fe / Ba 11 then added ammoniac in order that pH varies become 7,5; 9; and 11. Citric acid added in order that happen process of combustion. The stirring time was varieties by 1, 2, 3 hours. The effect of pH, stirring time, microstructure, phase,and magnetic properties were investigated using X-ray diffraction (XRD), Scanning Electron Microscope (SEM) and a vibrating sample magnetometer (VSM). The results showed that the highest coercivity was 0.6 Tesla and the smallest crystal size 414.409 nm was obtained for pH 7.5 and stirring time 2 hours. The largest magnetic saturation 55.54 emu /g was reached for pH 7.5 with stirring time 1 hour

Effect of Cooling Conditions on Nano-Sized NiFe2O4 Electrical Properties

2011 ◽  
Vol 222 ◽  
pp. 263-266 ◽  
Author(s):  
Andris Sutka ◽  
Gundars Mezinskis ◽  
Santa Lagzdina ◽  
Gatis Bebris
Keyword(s):  
Electrical Properties ◽  
Single Phase ◽  
Sol Gel ◽  
X Ray Diffraction ◽  
X Ray ◽  
Grain Sizes ◽  
Cooling Conditions ◽  
Auto Combustion ◽  
Phase Spinel ◽  
Nife2o4 Nanoparticles

Nickel ferrite NiFe2O4 nanoparticles have been prepared by sol-gel auto combustion. Two groups of samples were obtained from as-burnt and calcined powders by using various cooling conditions. The X-Ray diffraction (XRD) analyses confirm the single phase spinel structure for all samples. The grain sizes investigated by scanning electron microscopy (SEM) were found within the range of 70-100 nm. DC resistivities for different group of samples are strongly affected by cooling rate, showing the way how to control NiF2O4 electrical properties.

Shifting of X-Ray Diffraction Pattern Peak on BaFe12O19 Nanocrystalline Produced by Sol Gel Auto Combustion Method

2012 ◽  
Vol 576 ◽  
pp. 240-243
Author(s):  
Dwita Suastiyanti ◽  
Bambang Soegijono
Keyword(s):  
Crystallite Size ◽  
Diffraction Pattern ◽  
Permanent Magnets ◽  
Sol Gel ◽  
Barium Hexaferrite ◽  
Combustion Method ◽  
Heating Process ◽  
X Ray Diffraction ◽  
X Ray ◽  
Auto Combustion

Barium hexaferrite BaFe12O19 (BHF) is one of the great importance as permanent magnets, particularly for recording magnetic in microwave devices. Nanocrystalline BHF powders were prepared by sol gel auto combustion method in citric acid – metal nitrates system. Hence the mole ratios of Ba2+/Fe3+ were varied at 1:12; 1:11.5 and 1:11 and with pH of 7 in all cases using amonia solution. For final formation of nanocrystalline BHF, heating process was done at 850oC for 10 hours in all mol ratios of Ba2+/Fe3+. The nanocrystallite size was calculated from broadening X Ray Diffraction (XRD) peaks using Scherrer formula. XRD data shows that BHF of ratio 1:12 has the same diffraction pattern with the ratio of 1:11 especially at higher value of 2 θ. Diffraction pattern of BHF with the ratio of 1:11.5 was fitting in exactly to the standard searching match and the highest value of best Figure of Merit (FoM) is 90% with the crystallite size of 22 nm. The best FoM and crystallite size for ratio of 1:12 and 1: 11 are 88% and 56 nm respectively. The diffraction peaks of BHF with the ratio of 1:12 and 1:11 are in the right side from of 1:11.5 since the amount of impurity of both is higher (12%) than of BHF with the ratio of 1:11.5 (10%).

Structural, Morphological and Magnetic Characterization of Sm-substituted Ni-Zn Ferrite

2020 ◽  
Vol 10 (2) ◽  
pp. 152-156 ◽  
Author(s):  
Muhammad Hanif bin Zahari ◽  
Beh Hoe Guan ◽  
Lee Kean Chuan ◽  
Afiq Azri bin Zainudin
Keyword(s):  
Magnetic Properties ◽  
Rare Earth ◽  
Saturation Magnetization ◽  
Sol Gel ◽  
Magnetic Behavior ◽  
Rare Earth Ions ◽  
Ion Concentration ◽  
Zn Ferrite ◽  
Auto Combustion ◽  
Combustion Technique

Background: Rare earth materials are known for its salient electrical insulation properties with high values of electrical resistivity. It is expected that the substitution of rare earth ions into spinel ferrites could significantly alter its magnetic properties. In this work, the effect of the addition of Samarium ions on the structural, morphological and magnetic properties of Ni0.5Zn0.5SmxFe2-xO4 (x=0.00, 0.02, 0.04, 0.06, 0.08, 0.10) synthesized using sol-gel auto combustion technique was investigated. Methods: A series of Samarium-substituted Ni-Zn ferrite nanoparticles (Ni0.5Zn0.5SmxFe2-xO4 where x=0.00, 0.02, 0.04, 0.06, 0.08, 0.10) were synthesized by sol-gel auto-combustion technique. Structural, morphological and magnetic properties of the samples were examined through X-Ray Diffraction (XRD), Field-Emission Scanning Electron Microscope (FESEM) and Vibrating Sample Magnetometer (VSM) measurements. Results: XRD patterns revealed single-phased samples with spinel cubic structure up to x= 0.04. The average crystallite size of the samples varied in the range of 41.8 – 85.6 nm. The prepared samples exhibited agglomerated particles with larger grain size observed in Sm-substituted Ni-Zn ferrite as compared to the unsubstituted sample. The prepared samples exhibited typical soft magnetic behavior as evidenced by the small coercivity field. The magnetic saturation, Ms values decreased as the Sm3+ concentration increases. Conclusion: The substituted Ni-Zn ferrites form agglomerated particles inching towards more uniform microstructure with each increase in Sm3+ substitution. The saturation magnetization of substituted samples decreases with the increase of samarium ion concentration. The decrease in saturation magnetization can be explained based on weak super exchange interaction between A and B sites. The difference in magnetic properties between the samples despite the slight difference in Sm3+ concentrations suggests that the properties of the NiZnFe2O4 can be ‘tuned’, depending on the present need, through the substitution of Fe3+ with rare earth ions.

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