scholarly journals Magnetic Properties and Morphology Copper-Substituted Barium Hexaferrites from Sol-Gel Auto-Combustion Synthesis

Materials ◽  
2021 ◽  
Vol 14 (19) ◽  
pp. 5873
Author(s):  
Abdulmumeen Lohmaah ◽  
Komkrich Chokprasombat ◽  
Supree Pinitsoontorn ◽  
Chitnarong Sirisathitkul
Keyword(s):  
Magnetic Properties ◽  
Combustion Synthesis ◽  
Permanent Magnets ◽  
Sol Gel ◽  
Barium Hexaferrite ◽  
Secondary Phase ◽  
Cost Effective ◽  
Partial Substitution ◽  
Cu Substitution ◽  
Auto Combustion

The copper (Cu) substitution in barium hexaferrite (BaFe12O19) crystals from the sol-gel auto-combustion synthesis is demonstrated as a cost-effective pathway to achieve alterable magnetic properties. Subsequent heat treatments at 450 °C and 1050 °C result in irregularly shaped nanoparticles characterized as the M-type BaFe12O19 with the secondary phase of hematite (α-Fe2O3). Despite the mixed phase, the substantial coercivity of 2626 Oe and magnetization as high as 74.8 emu/g are obtained in this undoped ferrite. The copper (Cu) doing strongly affects morphology and magnetic properties of BaFe12−xCuxO19 (x = 0.1, 0.3, and 0.5). The majority of particles become microrods for x = 0.1 and microplates in the case of x = 0.3 and 0.5. The coercivity and magnetization tend to reduce as Cu2+ increasingly substitutes Fe3+. From these findings, magnetic properties for various applications in microwave absorbers, recording media, electrodes, and permanent magnets can be tailored by the partial substitution in hexaferrite crystals.

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.

Dielectric and magnetic properties of Zn-substituted Co2Y barium hexaferrite prepared by sol–gel auto combustion method

2016 ◽  
Vol 494 ◽  
pp. 33-40 ◽  
Author(s):  
I. Odeh ◽  
H.M. El Ghanem ◽  
S.H. Mahmood ◽  
S. Azzam ◽  
I. Bsoul ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Sol Gel ◽  
Barium Hexaferrite ◽  
Combustion Method ◽  
Auto Combustion

scholarly journals Sol-gel Auto Combustion Synthesis, Structural and Magnetic Properties of Mn doped ZnO Nanoparticles

2018 ◽  
Vol 20 ◽  
pp. 174-180 ◽  
Author(s):  
Shankar D. Birajdar ◽  
R.C. Alange ◽  
S.D. More ◽  
V.D. Murumkar ◽  
K.M. Jadhav
Keyword(s):  
Magnetic Properties ◽  
Combustion Synthesis ◽  
Zno Nanoparticles ◽  
Sol Gel ◽  
Auto Combustion ◽  
Structural And Magnetic Properties ◽  
Doped Zno ◽  
Mn Doped

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

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