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  1. #1
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    Permittivity of Ferrites

    Various sources give different information regarding permittivity of ferrites.
    They seem to agree that epsr = 10 to 20 for NiZn ferrites, but for MnZn ferrites they quote values from 10 to 300.
    I would like to know velocity of EM waves in ferrites, so knowing epsr would help.

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    Re: Permittivity of Ferrites

    It may be that the manufacturers do not know exactly - it will vary with temp, as many ferrites are quite conductive the permittivity would be ... very low as the dielectric constant is nearly infinite ... ?



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    Re: Permittivity of Ferrites

    You have to expect strong frequency dependence of permittivity and resistivity. A detailed discussion can be found in Snelling Soft Ferrites. See below curves for two NiZn ferrites.

    Click image for larger version. 

Name:	res NiZn.PNG 
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    Click image for larger version. 

Name:	perm Ni-Zn.PNG 
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Size:	35.1 KB 
ID:	150385


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