As much as I know, there is a proportional relationship between initial permeability and density for a particular composition. It means, if density increases with increasing sintering temperature, the initial permeability of that sample will increase. But, in some cases I have experienced that, density falls but the initial permeability of that sample increases instead of decreasing. Why this kind of phenomenon does happen?
Have you checked the phase composition of the samples?
Different phases with different grain sizes may be formed under different conditions. Microstructure, grain boundaries, single-domain or multi-domain particles - all play a role.
Dear Rakibul Hassan
this article may be useful to study
Article Density and permeability relationships in fabricated beryllia
Dear Fida Rehman,
here we are talking about a fundamentally different type of permeability, namely magnetic.
Honourable Alexander T. Morchenko,
My compositions have some impurities. May it be the cause of such kind of phenomenon?
Dear Rakibul Hassan,
It depends on what impurities and what their amount is. It is possible that your phase composition changes as the synthesis conditions change. Samples with a different phase composition may have a different density and a completely different permeability. It may also be that a different microstructure provides different mechanisms for remagnetization. Thus, my previous suggestion to check the phase composition and microstructure remains valid.
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