α-FeH_x (bcc)

<1175

>0.01

−171

γ-FeH_x (fcc)

1185 - 1590

(0.50)^a

−138

δ-FeH_x (bcc)

1665 - 1715

(0.50)^a

−100

α-FeC_x (bcc)

<1000

>0.10

−648

α-FeC_x (bcc)

1025 - 1150

>0.10

−613

γ-FeC_x (fcc)

1175 - 1575

0.20

−679

FeC_x (molten)

1550 - 1775

1.00

−699

α-FeN_x (bcc)

<1115

>0.05

−420

γ-FeN_x (fcc)

1250 - 1625

(0.50)^a

−455

δ-FeN_x (bcc)

1675 - 1715

(0.50)^a

−352

FeN_x (molten)

1850 - 2000

>0.10

−427

FeP_x (molten)

1475 - 1775

0.50

−347

FeS_x (molten)

1775 - 1875

1.00

−307