Barium Ferrite Powder: A Complete Analysis of Process, Properties and Industrial Applications

What is Barium Ferrite Powder?

Barium ferrite (chemical formula BaFe12O19; molecular weight 1111.46; CAS No. 11138-11-7; density 5.28 g/cm³; melting point >1315°C) is a hard magnetic material belonging to the hexagonal crystal system. It requires storage in a dry, sealed environment at room temperature. Preparation techniques for this material include the co-precipitation method, microwave-assisted hydrothermal synthesis, and others. Primarily utilized in the fields of perpendicular magnetic recording media, electronic memory devices, and microelectronic instrumentation, the nanoscale research of this material is regarded as a key direction in the development of magnetic materials.

Synthesis Process of Nanoscale Barium Ferrite Powder by Chemical Co-Precipitation

Co-precipitation Oxidation Method

In the precipitate containing ferrous ions, upon the addition of them, ferrous ions are rapidly oxidized, converting into δ-FeOOH. Heat treatment of δ-FeOOH doped with yield barium ferrite powder with an average particle size of 80 nm. The formation temperature of barium ferrite prepared by this method is 300 °C lower than that of the traditional co-precipitation process, which is mainly attributed to the unstable structure of barium-containing hematite.

The barium ferrite powder synthesized via this route features a low calcination temperature and reduced energy consumption. However, it exhibits a high coercivity (Hc​) and a low saturation magnetization (σs​) in magnetic properties. Further optimization of the process to appropriately reduce coercivity and enhance saturation magnetization will make this an excellent alternative method for preparing materials for perpendicular magnetic recording media.

Barium Ferrite Powder vs. Strontium Ferrite Powder: Wave Absorption Property, Magnetic Properties

Wave Absorption Property

Hexagonal barium ferrite (BaFe₁₂O₁₉) and strontium ferrite (SrFe₁₂O₁₉) were prepared by the citrate sol-gel method. The particle shape, size, and mineral composition of the product were studied using XRD, AFM, and TEM. The results showed that the average particle size of the ferrite was 50 nm. 

The dielectric constant and magnetic permeability of the ferrite within 0.1-6 GHz, as well as the microwave loss of the absorbing coating within 12-18 GHz, were tested using a network analyzer. 

The results show that the imaginary part of the dielectric constant of barium and aluminum ferrites is basically the same as the loss tangent shape, but barium ferrites have more loss tangent peaks in a wider frequency range, and the absorption performance of barium ferrites is better than that of strontium ferrites.

Magnetic Properties

Strontium ferrite (SrFe₁₂O₁₉) powder generally offers superior magnetic performance compared to barium ferrite (BaFe₁₂O₁₉), featuring higher saturation magnetization (Mₛ), higher coercivity (H_ci), and greater maximum energy products ((BH)max). While barium ferrite is cheaper, strontium ferrite is preferred for high-performance motors, speakers, and, due to its biocompatibility, specialized biomedical applications.

Magnesium-zinc Ferrite Powder

Nickel-zinc Ferrite Powder

Low-power Manganese Zinc Ferrite Powder

Wide-temperature Low-power Ferrite Powder

High Permeability Manganese Zinc Ferrite Powder

Barium Ferrite Powder CAS 11138-11-7

Core Industrial Applications of Barium Ferrite Powder

Key Application of Barium Ferrite Powder in Perpendicular Magnetic Recording Media

Perpendicular magnetic recording is the core technology of modern high-density data storage, and nanoscale barium ferrite powder is the most ideal magnetic recording material for this technology, known as the "core material of digital storage." Its unique hexagonal flake structure and excellent magnetic properties make it far superior to traditional metal magnetic powder in high-density magnetic recording applications.

First, the nanoscale barium ferrite powder has a narrow particle size distribution (less than 460 nm) and a single-domain structure, which can realize the high-density arrangement of magnetic particles on the recording medium, and the storage density is far higher than that of traditional magnetic powder.

Second, it has a high signal-to-noise ratio, and the magnetic signal is clear and stable during data reading and writing, which effectively reduces the data error rate. Third, it has excellent thermal stability and chemical stability, is not easy to oxidize and demagnetize, and can ensure the long-term preservation of data (the data retention period can reach more than 10 years). 

At present, nanoscale barium ferrite powder is widely used in high-density data tapes, enterprise-level storage disks, magnetic cards, and other perpendicular magnetic recording media and is the core raw material for the data storage industry.

Why Barium Ferrite Powder Is the Top Pick for Permanent Magnet Motor Components

Permanent magnet motors are the core components of household appliances, industrial equipment, new energy vehicles, and other products, and the selection of magnetic materials directly determines the performance and cost of the motor. Barium ferrite powder has become the first choice for manufacturing low-to-medium power permanent magnet motor components due to its outstanding comprehensive advantages, and its market penetration rate in the small and medium motor industry exceeds 60%.

Cost advantage: 

Barium ferrite powder does not contain rare earth elements such as neodymium and praseodymium, and the raw material cost is low. Compared with rare earth permanent magnet materials, the production cost of permanent magnet motor components prepared from it is reduced by more than 50%, which is suitable for the large-scale production of household appliances and low-power industrial motors.

Excellent environmental adaptability: 

It has strong corrosion resistance and high-temperature resistance, needs no additional anti-corrosion coating on the surface, and can work stably in humid, dusty, and high-temperature (below 200°C) industrial environments.

Stable magnetic performance: 

The moderate coercivity and remanent magnetization of barium ferrite powder can ensure the stable output of motor power, and the anti-demagnetization ability is strong. It will not cause the attenuation of motor performance due to the external magnetic field interference and temperature change during the operation of the motor.

Who is the Best Barium Ferrite Powder Supplier for You?

When selecting a barium ferrite powder supplier, the key evaluation indicators include product quality stability, production capacity, technical service level, and after-sales support. For enterprises engaged in magnetic recording, motor manufacturing, electronic component production, and other industries, Kerton Chemicals (website: https://www.kerton-industry.com/) is the best choice for a professional and reliable barium ferrite powder supplier, with decades of experience in chemical production and R&D, and it has become a global provider of chemical solutions covering research, industry, and life sciences.