Synthesis and Magnetic Characterization of Cu Substituted Barium Hexaferrites
Cu 2+ ion substituted nanocrystalline BaFe 12 O 19 [Ba 1 − x Cu x Fe 12 O 19 (0.0 ≤ x ≤ 0.5)] hexaferrite powders were synthesized by sol–gel combustion route and its effects on structure, morphology and magnetic properties of barium hexaferrite (BaFe 12 O 19 ) were presented. X-Ray Powder Diffracti...
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| Published in: | Journal of inorganic and organometallic polymers and materials 2018-05, Vol.28 (3), p.1065-1071 |
|---|---|
| Main Authors: | , , , , , |
| Format: | Article |
| Language: | eng |
| Subjects: | |
| Online Access: | Get full text |
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| Summary: | Cu
2+
ion substituted nanocrystalline BaFe
12
O
19
[Ba
1 − x
Cu
x
Fe
12
O
19
(0.0 ≤ x ≤ 0.5)] hexaferrite powders were synthesized by sol–gel combustion route and its effects on structure, morphology and magnetic properties of barium hexaferrite (BaFe
12
O
19
) were presented. X-Ray Powder Diffraction (XRD), Scanning Electron Microscopy (HR-SEM), Transmission Electron Microscopy (HR-TEM) and Fourier Transform Infrared (FT-IR) analyses revealed the M-type hexagonal structure of all samples. Vibrating sample magnetometer (VSM) analyses showed that all samples have strong ferromagnetic behavior at room temperature. The crystallite size varies in a range of 23.30–35.12 nm. Both HR-SEM and HR-TEM analyses confirmed the hexagonal morphology for products. A minimum of 40.49 and a maximum of 54.36 emu/g estimated specific saturation magnetization (σ
s
) were observed for Ba
0.5
Cu
0.5
Fe
12
O
19
and Ba
0.9
Cu
0.1
Fe
12
O
19
NPs, respectively. The remnant magnetization (σ
r
) has a minimum value of 21.27 emu/g belonging to Ba
0.5
Cu
0.5
Fe
12
O
19
and has a maximum value of 28.15 emu/g belonging to Ba
0.7
Cu
0.3
Fe
12
O
19
NPs. The coercive fields are between 1726 Oe and 2853 Oe.
K
eff
(calculated effective anisotropy constants) is changing from 2.31 × 10
5
to 3.23 × 10
5
Ergs/g. It was observed that the strong magneto-crystalline anisotropy fields, (
H
a
) above 11.0 kOe for all samples which confirmed that all samples are hard magnet. Due to their small crystallite size (smaller than 50 nm) and high saturation magnetization, Ba
1 − x
Cu
x
Fe
12
O
19
(0.0 ≤ x ≤ 0.5) nanoparticles can be employed as magnetic recording materials. |
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| ISSN: | 1574-1443 1574-1451 |