li substituted cu-mn ferrites

03/05/2023 1

Synthesis ,Characterization & Magnetic Behaviour of Li Substituted Cu-Mn Ferrites

Nanoparticles

Under the Supervision of

Dr Shipra Mital Gupta

USBAS

Submitted by:

Nikita Gupta

M.Tech-NST

01140801014

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Introduction:

• Magnetism is a force of attraction or repulsion that acts at a distance.• It is a property of materials that respond to an applied magnetic field.• Magnetism aries fron two sources: a) electric current b) spin magnetic moments of elementary particles.• The magnetic behaviour of a material depends on its structure and

temperature.

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Types Of Magnetic Materials

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Ferrites:

• Iron oxides such as hematite or magnetite (Fe3O4): first magnetic material, very stable and easy to synthesize. Biocompatible, minimally toxic, used in many clinical studies • Reasonably large saturation magnetization (~90 emu/g). The most

widely investigated types of magnetic nanoparticle for biomedical applications. • Normally there are two types of structures in ferrites.

Regular spinel Inverse spinel

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Structure of ferrites:

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Magnetization in Fe3O4:

Jun Liu, Yuezhen Bin, Masaru MatsuoThe Journal of Physical Chemistry Wednesday December 21st 2011

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Li Substituted Cu-Mn Ferrites Nanoparticle:Manganese ferrite (MnFe2O4) nanoparticles have become very popular due to their wide range of magnetic applications, such as recording devices, drug delivery, ferrofluid, biosensors, and catalysis. Recently, Deraz and Alarifi have studied structural and magnetic properties of MnFe2O4 nanoparticles by combustion route. The Cu content was found to have a significant influence on the electromagnetic properties. Lithium ferrites are low-cost materials which are attractive for microwave device applications. Hence, there has been a growing interest in Li-substituted Cu-Mn ferrite for microwave applications and high permeability with low magnetic loss.

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Experimental part:

• Taken analytical grade of Li (N0)3 (M=68.95g/mol), CuCl2.2H2O (M=170.48g/mol), MnN2O6.4H2O (M=251.01g/mol), Fe (NO3)3.9H2O (M=404g/mol) as raw material and LixCu0.12Mn0.88-2xFe2+xO4 (x=0, 0.20, 0.40, 0.44) ferrites were prepared by autocombusition method.

Sample x Composition

1 0 Li0Cu0.12Mn0.88Fe2O4

2 0.20 Li0.20Cu0.12Mn0.48Fe2.2O4

3 0.40 Li0.40Cu0.12Mn0.08Fe2.4O4

4 0.44 Li0.44 Cu0.12Mn0Fe2O4

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Sample 1: Sample 2:

Chemical compound Weight (gms) in 20 ml ethanol

CuCl2.2H2O 0.40 gms

MnN2O6.4H2O 4.40 gms

Fe (NO3)3.9H2O 16.16 gms


CuCl2.2H2O 0.20 gms


Fe (NO3)3.9H2O 8.8 gms

Li (N0)3 0.13 gms

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Sample 3 Sample 4


CuCl2.2H2O 0.20 gms


Fe (NO3)3.9H2O 9.6 gms

Li (N0)3 0.27 gms


CuCl2.2H2O 0.20 gms

Fe (NO3)3.9H2O 8.08 gms

Li (N0)3 0.30 gms

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Characterization techniques

Vibrating sample magnetometer (VSM) :Sample 1 Li0Cu0.12Mn0.88Fe2O4

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Sample 2 Li0.20Cu0.12Mn0.48Fe2.2O4

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Sample 3 Li0.40Cu0.12Mn0.08Fe2.4O4

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Sample 4 Li0.44 Cu0.12Mn0Fe2O4

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• From the above results, it was concluded that magnetization increases from 5.08 emu/g to 45.35 emu/g as the Li content increases from sample 1 to sample 4 and it was observed that these samples are ferromagnetic in nature.

Sample Magnetization emu/g

1 5.0869

2 14.409

3 45.044

4 45.359

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Field Emission Scanning electron microscopy (FESEM) Sample 1: Sample 2:

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Sample 3: Sample 4:

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• The grain size (D) also called as particle size is significantly dependent on Li substitution. The D increases with increasing Li substitution for fixed calcinating temperature which is shown in above results. This is probably due to the lower melting temperature of Li (180 °C) compared to Mn (1245°C). The values of D for various samples are shown in table below:

Sample Grain Size(nm)

1 96

2 97

3 101

4 112

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Conclusion• The Li substituted Cu-Mn ferrites (X= 0.00 to 0.44) nanoparticles have been

prepared successfully synthesised by the auto combustion technique. • The study of FESEM shows that grain size is dependent on increasing Li content.

Grain size increases with increasing Li content for fixed temperature ranges from 96 nm to 112 nm. This is because of the lower melting point of Li as compared to Mn.• The magnetic behaviour were also studied by using VSM and it was showed that

the samples are ferromagnetic in nature and magnetization increases with increase in magnetization from 5.08 emu/g to 45.34 emu/g.• Li substitutes Cu-Mn ferrites nanoparticles have been successfully prepared now

we can use these samples for various applications like microwave applications because of high permeability with low magnetic loss and other wide range of magnetic applications, such as recording devices, drug delivery, hyperthermia, ferrofluid, biosensors, and catalysis.

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References• Research article ‘Synthesis and characterization of Li substituted Cu-Mn ferrite nanoparticle’ by

M.A.Mohshin Quraishi & M.H.R. Khan. Indian Journal of Materials Science, Volume 2013, Article ID 910762,7 pages, http://dx.doi.org/10.1155/2013/910762

• Research article ‘Synthesis and Characterization of Cobalt Ferrite Nanoparticles by Sol-Gel Autocombusition Method’ by H.B. SHARMA, N.G. BOINIS SINGH, S. BOBBY SINGH and TH. DHANABATI DEVI. Invertis Journal Science and Technology Vol-7, No-2,

• Combustion synthesis and nanomaterials by Singanahally T. Aruna, Alexander S. Mukasyan 2014, pp. 77-84.• Research article ‘Magnetic, dielectric and sensing properties of manganese substituted copper ferrite

nanoparticles’ by E. Ranjith Kumar, R. Jayaprakash, G. Sarala Devi , P. Siva Prasada Reddy in JOURNAL OFMAGNETIS AND MAGNETIC MATERIALS·APRIL 2014, DOI:10.1016/j.jmmm.2013.11.051.

• Ferrite - Wikipedia, the free encyclopaedia https://en.wikipedia.org/wiki/Ferrite

• Research thesis ‘SYNTHESIS AND CHARACTERIZATION OF LANTHANUM DOPED CaCu3Ti4O12 BY AUTO-COMBUSTION TECHNIQUE’.

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Thank you!!

li substituted cu-mn ferrites

Engineering