Industrial Consultancy & Sponsored Research (IC&SR) , IIT Madras
Hetero-Atom Induced Ferromagnetism In Antiferromagnetic Hematite
Categories for this Invention
Technology: Atom induced Ferromagnetism
Category: Pyrolytic synthesis
Industry: Materials Science,Energy Storage Industry
Application: Nanomagnetic devices, nanobiosensors, batteries, giant magnetoresistance device
Market: The global market size of magnetic materials market size was exhibited at USD 27.85 billion in 2022 and is projected to hit around USD 51.54 billion by 2032 with a registered CAGR of 6.4% during the forecast period 2023 to 2032.
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Problem Statement
- Transition metals, such as iron, have been extensively researched due to their unique properties like variable valences and photoluminescence.
- Iron’s three oxides, Fe3O4, FeO, and Fe2O3, have magnetic properties, but their antiferromagnetic nature limits their potential applications.
- Several methods are used for synthesizing ferromagnetic α- Fe2O3, with most resulting in magnetization of 1-4 emu/g, with some tedious methods like template assisted solution combustion synthesis.
- But it is time-consuming and requires numerous intermediate steps and chemicals.
- There is a need for the method of preparation thereof that overcomes some of the drawbacks of the existing methods
Technology
- A method of pyrolytic synthesis of ferromagnetic hematite iron oxide composite, the method comprising:
- Heating a composite admixture comprising at least one iron precursor selected from
- iron nitrate, iron chloride or iron sulphate, and
- at least one heteroatom precursor in a predetermined weight ratio to
- a temperature between 400 °C to 750 °C under
- an air atmosphere to form ferromagnetic hematite iron oxide,
wherein the heteroatom precursor is selected from
- nitrogen, sulfur, boron or carbon precursors,
wherein the heat treatment is carried out
- for 2h to 3h, and
wherein the predetermined weight ratio of
- heteroatom precursor to iron precursor is in the range of 2:1 to 1:2.
Key Features / Value Proposition
Hematite iron oxide Structure
- Rhombohedral crystal structure
space group
- R-3c
Process
- Pyrolysis is the chemical decomposition of organic material in the absence of oxygen
weight ratio of heteroatom precursor to antiferromagnetic hematite iron oxide
- 2:1 to 1:2.
Carbon precursor
- Paracetamol, urea, melamine, graphitic carbon nitride, carbon nanotubes, graphene oxide, graphene, or carbon nanofiber.
Sulfur precursor
- Sodium nitrate or ammonia.
Solvent
- No solvent is used
Boron precursor
- Boric oxide, sodium borohydride or boric acid
Nitrogen precursor
- Sodium nitrate or ammonia.
Questions about this Technology?
Contact For Licensing
sm-marketing@imail.iitm.ac.in
ipoffice2@iitm.ac.in
Research Lab
Prof. Ramaprabhu S
Department of Physics.
Intellectual Property
- IITM IDF Ref. 2333
- Patent No: IN 539709
Technology Readiness Level
TRL-4
Experimentally validated in Lab;