Beta ferrite

Beta ferrite is ferrite that is paramegnetic instead of ferromagnetic, heated to a temperature of above 771°C.

β-Fe may refer to an unproven to exist fifth allotrope of iron, only produced once in Uppsala University. Iron was compressed to 35-40 GPa then heated to 1500°K and scanned. The result was never reproduced.

Beta Ferrite Media

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  Low-pressure phase diagram of pure iron. BCC is body centered cubic and FCC is face-centered cubic.

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  Iron-carbon eutectic phase diagram, showing various forms of FexCy substances.

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  Iron allotropes, showing the differences in structure. The alpha iron (α-Fe) is a body-centered cubic (BCC) and the gamma iron (γ-Fe) is a face-centered cubic (FCC).

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  Molar volume vs. pressure for α-Fe at room temperature.

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  Figure 1: The beta field and A2 critical temperature on the iron-rich side of the iron-carbon phase diagram.