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63, Cmcm, lattice parameters a = 285.4 pm, b = 587 pm, c = 495.5 pm.
* ? (tetragonal) stable from 668 to 775 C. Tetragonal, space group P4₂/mnm, P4₂nm, or P4n2, lattice parameters a = 565.6 pm, b = c = 1075.9 pm.
* ? (body-centered cubic) from 775 C to melting point--this is the most malleable and ductile state. Body-centered cubic, lattice

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