Table 1 The structural type, space group, lattice parameters, Wyckoff positions and fractional atom coordinates in W2B, V3B2 and Cr5B3 phase

From: The Wyckoff positional order and polyhedral intergrowth in the M3B2- and M5B3-type boride precipitated in the Ni-based superalloys

Structure

Space group

Unit cell (nm)

Atom

Fractional coordinates

W 2 B

I4/mcm (no. 140)

a = 0.557

Cr (8h)

0.169

0.669

0.000

C16

 

c = 0.474

B (4a)

0.000

0.000

0.250

V 3 B 2

P4/mbm (no. 127)

a = 0.576

V (4h)

0.173

0.673

0.500

D5 a

 

c = 0.304

V (2a)

0.000

0.000

0.000

   

B (4g)

0.388

0.888

0.000

Cr 5 B 3

I4/mcm (no. 140)

a = 0.546

Cr (16l)

0.166

0.666

0.150

   

Cr(4c)

0.000

0.000

0.000

D8 1

 

c = 1.064

B (8h)

0.625

0.125

0.000

   

B (4a)

0.000

0.000

0.250