The structure and magnetic properties of pure single phase BiFeO3 nanoparticles by microwave-assisted sol-gel method

2018 ◽  
Vol 735 ◽  
pp. 945-949 ◽  
Author(s):  
Shuai Zheng ◽  
Jiangying Wang ◽  
Jingji Zhang ◽  
Hongliang Ge ◽  
Zhi Chen ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Single Phase ◽  
Sol Gel ◽  
Gel Method ◽  
Sol Gel Method ◽  
Microwave Assisted ◽  
Bifeo3 Nanoparticles

Preparation and Magnetic Properties of La-Substituted Strontium Hexaferrite by Microwave-Assisted Sol-Gel Method

2016 ◽  
Vol 29 (4) ◽  
pp. 981-984 ◽  
Author(s):  
Zhanyong Wang ◽  
Wenya Yang ◽  
Zhipeng Zhou ◽  
Minglin Jin ◽  
Jiayue Xu ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Sol Gel ◽  
Strontium Hexaferrite ◽  
Gel Method ◽  
Sol Gel Method ◽  
Microwave Assisted

Nanosize Effects on Magnetic Properties and Peak Shifting of X-Ray Diffraction Pattern of BaFe12O19 Produced by Sol Gel Method

2013 ◽  
Vol 789 ◽  
pp. 87-92 ◽  
Author(s):  
Dwita Suastiyanti ◽  
Bambang Soegijono ◽  
M. Hikam
Keyword(s):  
Magnetic Properties ◽  
Diffraction Pattern ◽  
Single Phase ◽  
Sol Gel ◽  
Peak Position ◽  
X Ray Diffraction ◽  
Xrd Pattern ◽  
Gel Method ◽  
X Ray ◽  
Sol Gel Method

The formation of barium hexaferrite, BaFe12O19 single phase with nanosize crystalline is very important to get the best performance especially magnetic properties. The samples were prepared by sol gel method in citric acid-metal nitrates system. Hence the mole ratios of Ba2+/Fe3+ were varied at 1:12 and 1:11.5 with pH of 7 in all cases using ammonia solution. The solution was then heated at 80-90°C for 3 to 4 hours. Then it was kept on a pre-heated oven at 150°C. The samples were then heat treated at 450°C for 24 hours. Sintering process was done at 850°C and 1000°C for 10 hours.Crystallite size was calculated by X-Ray Diffraction (XRD) peaks using scherrer formula. To confirm the formation of a single phase, XRD analyses were done by comparing the sample patterns with standard pattern. The peak shifting of pattern could be seen from XRD pattern using rocking curves at extreme certain 2θ. It was used MPS Magnet Physik EP3 Permagraph L to know magnetic characteristics. This method can produce BaFe12O19 nanosize powder, 22-34 nm for crystallite size and 55.59-78.58 nm for particle size. A little diference in nanosize affects the peak shifting of XRD pattern significantly but shows a little difference in magnetic properties especially for samples at 850°C and 1000°C with mole ratio of 1:12 respectively. The well crystalline powder is formed at mole ratio of 1:11.5 at 850°C since it has the finest particle (55.59 nm) and crystalline (21 nm), the highest remanent magnetization (0.161 T) and the lowest intrinsic coersive (275.8 kA/m). It is also fitting exactly to the standard diffraction pattern with the highest value of best Figure of Merit (FoM), 90%. XRD peak position of this sample is almost same with XRD peak position of another sample with sinter temperature 1000°C at same mole ratio.

scholarly journals Improving Magnetic Properties of BiFeO3-BaFe12O19 Solid Solution by Different Sintering Time and Temperatures of Sol-Gel Method

2019 ◽  
Vol 7 (5) ◽  
Author(s):  
Dwita Suastiyanti ◽  
Yuli Nurul Maulida ◽  
Marlin Wijaya
Keyword(s):  
Solid Solution ◽  
Magnetic Properties ◽  
Single Phase ◽  
Magnetic Energy ◽  
Sol Gel ◽  
Weight Ratio ◽  
Gel Method ◽  
Sol Gel Method ◽  
Large Current

Synthesis of BiFeO3-BaFe12O19 solid solution is aimed to enhanced magnetic properties of the material which can improve the quality of multiferroic properties of material. As we know that BiFeO3 is a multiferroic material if it is in single phase but unfortunately it is difficult to produce BiFeO3 in single phase, which can cause a large current leakage arising from non stoichiometric. It used sol gel method to produce BiFeO3-BaFe12O19 solid solution with weight ratio of 1;1. To know magnetic properties, it was used permagraph test which is type of MPS magnet – Physic EP3 – Permagraph L . The sintering temperature was 750, 800 and 850oC for 8, 10 and 12 hours respectively. There is no regularity in increasing and decreasing of remanent and coersivity properties with increasing sinter temperatures and time of sintering but there is an increasing magnetic energy with increasing sinter temperatures and time of sintering. The highest value of magnetic energy, 10.716 GkA/m  belongs to powder sintered at 850oC for 12 hours.

scholarly journals Peningkatan Daya Listrik Pada Generator Putaran Rendah Melalui Peningkatan Sifat Magnetik Magnet Permanen Bafe12o19

2020 ◽  
Vol 4 (1) ◽  
pp. 12
Author(s):  
Kevin Andreas
Keyword(s):  
Magnetic Properties ◽  
Electric Power ◽  
Single Phase ◽  
Magnetic Energy ◽  
Sol Gel ◽  
Electrical Power ◽  
Gel Method ◽  
Sol Gel Method ◽  
Powder Characteristics ◽  
Constituent Elements

AbstrakGenerator adalah suatu alat atau sistem yang dapat mengubah tenaga mekanis menjadi tenaga listrik dan menghasilkan tenaga listrik bolak-balik atau tenaga listrik searah tergantung pada tipe generator. Umumnya magnet yang digunakan pada Generator putaran rendah adalah NdFeB, yang sulit diperoleh unsur-unsur pembentuknya, maka digunakan bahan BaFe12O19 sebagai magnet alternatif. Tujuan penelitian ini adalah untuk memperoleh sifat magnetik tertinggi pada BaFe12O19 melalui variasi perlakuan sinter. Metodologi yang digunakan pada penelitian ini yaitu menggunakan metode sol-gel, dengan pengujian karakteristik serbuk yaitu permagraph,XRD dan SEM. Parameter yang digunakan yaitu pada temperatur sinter 750ºC, 800ºC dan 850ºC, masing-masing dilakukan selama 8,10,12 jam. Hasil penelitian menunjukkan bahwa untuk menghasilkan daya listrik yang tinggi pada generator dapat digunakan BaFe12O19 dengan rasio mol              Ba:Fe = 1:12 dengan kondisi temperatur sinter 850°C dan waktu sinter 12 jam. Pada kondisi tersebut dihasilkan energi magnetik terbesar (89,019 T.kA/m) dan serbuk dalam kondisi fasa tunggal (100% BaFe12O19).Kata kunci: Generator, Magnet Permanen, Metode Sol-Gel, BaFe12O19Abstract A generator is a device or system that can convert mechanical power into electric power and produce alternating electric power or electric power in the direction of the type of generator. Generally the magnet used in the low speed generator is NdFeB, which is difficult to obtain by its constituent elements, so BaFe12O19 is used as an alternative magnet. The purpose of this study was to obtain the highest magnetic properties on BaFe12O19 through variations of sintered treatment. The methodology used in this study is using the Sol-Gel Method, by testing powder characteristics, namely Permagraph, XRD and SEM. The parameters used were sintered temperatures of 750ºC, 800ºC and 850ºC, each carried out for 8,10.12 hours. The results showed that BaFe12O19 with a high mol ratio Ba: Fe = 1:12 to produce high electrical power at the generator with conditions sintered 850 ° C and sintered time 12 hours. In this condition, the largest magnetic energy (89,019 T.kA / m) and powder were produced under single phase conditions (100% BaFe12O19).Keywords: Generator, Permanent Magnet, Sol-Gel Method, BaFe12O19

scholarly journals Synthesis of SrFe12O19 by sol-gel method and its morphology and magnetic properties

2016 ◽  
Vol 19 (3) ◽  
pp. 5-10
Author(s):  
Quynh Anh Bao Le ◽  
Vu Hoang Nguyen ◽  
Hoang Thi Thuy Tran ◽  
Ha Ky Phuong Huynh
Keyword(s):  
Crystal Structure ◽  
Magnetic Properties ◽  
Single Phase ◽  
Sol Gel ◽  
X Ray Diffraction ◽  
Powder Morphology ◽  
Gel Method ◽  
Sol Gel Method ◽  
Structure Morphology ◽  
Xrd Patterns

In this research, strontium hexa-ferrite nanoparticles (SrFe12O19) were synthesized by sol-gel method. The crystal structure, morphology and magnetic properties of nanoparticles were investigated using X-ray Diffraction (XRD), Scanning Electron Microscope (SEM) and Vibrating Sample Magnetometer (VSM). The XRD patterns confirmed the formation of single phase M-type hexagonal crystal structure for powders which was calcined above 700oC. The product shows the magnetization of 66 emu/g, which is consistent with pure hexa-ferrite obtained by other methods, and the magnetic coercivity of 6,145 kOe higher than expected for this hexa-ferrite. The powder morphology is composed of aggregates of hexagonal particles with an average particles size of above 100nm.

scholarly journals Structure and Magnetic Properties of SrFe12O19/CoFe2O4 Nanocomposite Ferrite

2019 ◽  
Vol 35 (2) ◽  
Author(s):  
Trần Thị Việt Nga ◽  
Nguyen Thi Lan ◽  
To Thanh Loan ◽  
Hoang Ha
Keyword(s):  
Magnetic Properties ◽  
Hysteresis Loop ◽  
Single Phase ◽  
Sol Gel ◽  
Volume Ratio ◽  
Nanocomposite Particles ◽  
Gel Method ◽  
Sol Gel Method ◽  
Molar Ratios ◽  
Magnetization Behavior

Abstract: Nanocomposite particles SrFe12O19/ CoFe2O4 were synthesized by sol-gel method. The nanocomposites are formed at the calcining temperature around 850 oC in 5 hours. The phase composition, surface morphology and magnetic properties of the nanocomposites were investigated using XRD, SEM and VSM, respectively. The results show that the magnetic properties of nanocomposite particles are strongly influenced by the molar ratios of the hard and soft phases and particle size distributions. The samples with the mass ratio of Rm= SrFe12O19/ NiFe2O4 = 1/3 and 1/5 are characterized with a “bee waist” type hysteresis loop. While all the samples RV show an excellent smooth hysteresis loop and a single – phase magnetization behavior. The coercivity decreases significantly and the magnetization drastically increases with decreasing of volume ratio RV. Keywords: nanocomposite, sol- gel method, exchange coupling.   

Ferroelectric and Magnetic Properties of CoFe 2 O 4/BaTiO 3 Prepared by Microwave-Assisted Sol-Gel Method

2016 ◽  
Vol 30 (2) ◽  
pp. 539-543 ◽  
Author(s):  
Wenya Yang ◽  
Zhanyong Wang ◽  
Tianpeng Wang ◽  
Minglin Jin ◽  
Jiayue Xu ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Sol Gel ◽  
Gel Method ◽  
Sol Gel Method ◽  
Microwave Assisted

Structural, Optical, Dielectric and Magnetic Properties of Cu Doped BiFeO3 Nanoparticles Synthesized by Sol Gel Method

2014 ◽  
Vol 3 (1) ◽  
pp. 60-66 ◽  
Author(s):  
Shraddha Agrawal ◽  
Ali Jawad ◽  
S. S. Z. Ashraf ◽  
A. H. Naqvi
Keyword(s):  
Magnetic Properties ◽  
Sol Gel ◽  
Gel Method ◽  
Sol Gel Method ◽  
Bifeo3 Nanoparticles ◽  
Optical Dielectric

Annealing Effects on the Physical and Magnetic Properties of Tb1.5Y1.5Fe5O12 Films Nanoparticles Prepared by Sol-Gel Method

2013 ◽  
Vol 756 ◽  
pp. 91-98 ◽  
Author(s):  
Ftema W. Aldbea ◽  
Noor Bahyah Ibrahim ◽  
Mustafa Hj. Abdullah
Keyword(s):  
Particle Size ◽  
Magnetic Properties ◽  
Annealing Temperature ◽  
Quartz Substrate ◽  
Sol Gel ◽  
Lattice Parameter ◽  
Gel Method ◽  
X Ray ◽  
Sol Gel Method ◽  
Iron Garnet

Terbium –substituted yttrium iron garnet (Tb1.5Y1.5Fe5O12) films nanoparticles were successfully prepared by a sol-gel method. The films were deposited on the quartz substrate using spin coating technique. To study effect of annealing temperature, the annealing process was executed at 700, 800 and 900 °C in air for 2 hours. The X-ray diffraction (XRD) proved that the pure phase of garnet structure was detected for the film annealed at 900 °C. The lattice parameter increased with the increment of annealing temperature and the highest value of 12.35 Å was obtained at 900 °C. Field Emission Scanning Electron Microscope (FE-SEM) results showed that the particle size increased from 43nm to 56nm as annealing temperature increased from 700 to 900°C. The film’s thickness also affected by increasing of annealing temperature and become thin at 900 °C due to densification process occurred at high annealing temperature. The elemental compositions of the Tb1.5Y1.5Fe5O12 film were detected using an Energy Dispersive X-raySpectroscopy (EDX). Magnetic properties at room temperature were measured using a Vibrating Sample Magnetometer (VSM).The saturation magnetization Ms increased with the annealingtemperature and showed a high value of 104emu/cm3, but the coercivity Hc of the film was decreased due to the increment of the particle size. Normal 0 21 false false false MS X-NONE X-NONE MicrosoftInternetExplorer4 Terbium –substituted yttrium iron garnet (Tb1.5Y1.5Fe5O12) films nanoparticles were successfully prepared by a sol-gel method. The films were deposited on the quartz substrate using spin coating technique. To study effect of annealing temperature, the annealing process was executed at 700, 800 and 900°C in air for 2 hours. The X-ray diffraction (XRD) proved that the pure phase of garnet structure was detected for the film annealed at 900 °C. The lattice parameter increased with the increment of annealing temperature and the highest value of 12.35 Å was obtained at 900 °C. Field Emission Scanning Electron Microscope (FE-SEM) results showed that the particle size increased from 43nm to 56nm as annealing temperature increased from 700 to 900 °C. The film’s thickness also affected by increasing of annealing temperature and become thin at 900 °C due to densification process occurred at high annealing temperature. The elemental compositions of the Tb1.5Y1.5Fe5O12 film were detected using an Energy Dispersive X-ray Spectroscopy (EDX). Magnetic properties at room temperature were measured using a Vibrating Sample Magnetometer (VSM).The saturation magnetization Ms increased with the annealing temperature and showed a high value of 104emu/cm3, but the coercivity Hc of the film was decreased due to the increment of the particle size. st1\:*{behavior:url(#ieooui) } /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:"Times New Roman"; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi;}

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