Iron: Beta

: Because it shares the BCC structure with alpha iron, it possesses similar mechanical properties, though it is slightly less dense due to thermal expansion at higher temperatures. Technical Comparison of Iron Phases Common Name Crystal Structure Magnetic State Temperature Range Alpha ( ) Ferromagnetic Beta ( ) Beta Iron BCC Paramagnetic Gamma ( ) Non-magnetic Delta ( ) Delta Ferrite Non-magnetic (PDF) The Beta Iron Controversy Revisited - ResearchGate

), heating iron past the Curie point does not change the physical arrangement of atoms, only their magnetic ordering. : It is stable between beta iron

, it undergoes a true allotropic transformation into Austenite ( ), which has a Face-Centered Cubic (FCC) structure. : Because it shares the BCC structure with