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Nickel-Zinc Ferrite Specimen Preparation

Metallographic etchant database

Ferrite ceramics produce one of the strongest types of magnetics, and consist of iron, boron and barium, or strontium and molybdenum. A ferrite material is a ceramic magnet which has high magnetic permeability, which allows it to store stronger magnetic fields than iron.

Specimen preparation of friable or brittle materials such as ferrites can be difficult. Proper microstructural preparation of these materials must maintain the structure of the Ni-Fe ferrite structure. This is accomplished by mounting the ferrite in a castable mounting compound such as epoxy. Initial grinding with a 320 grit or finer SiC paper is required to prevent pulling out the ferrite particles, especially the smaller particles. Rough polishing is accomplished on woven polishing cloths using diamond, with final polishing on high napped cloth using a polycrystalline alumina abrasive.


Diamond wafer cutting with medium grit / low concentration diamond blades

Castable mounting acrylics or epoxies




Force/ sample



240 grit SiC paper
360 grit SiC paper
600 grit SiC paper
800 grit SiC paper
1200 grit Sic paper


5-10 lbs

100/100 rpm

Until plane
1 minute
1 minute
1 minutes
1 minute

1 um DIAMAT diamond on ATLANTIS polsihing pad

SIAMAT Colloidal Silica

5-10 lbs

100/100 rpm

5 minutes

0.05 um Nanometer alumina on NAPPAD polishing pad


5-10 lbs

100/100 rpm

1 minutes

Metallographic micrograph of Ni-Zin ferrite

Ni-Zn ferrite, 400X (B.F.), as polished condition

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