Komkov A I
Soviet Physics Crystallography 4 (1959) 796-800
The structure of natural fergusonite, and a polymorphic modification
Locality: Ural Mountains, Russia
5.16 5.16 10.89 90 90 90 I4_1/a
atom x y z occ
Y 0 0 .5 .85
Yb 0 0 .5 .15
Nb 0 0 0
O .185 .25 .092
The structure of natural fergusonite, and of a polymorphic modification
Sample: annealed at T = 1000 C for t = 15 min
5.05 10.89 5.27 90 94.50 90 I2
Y1 0 .476 0 .85
Yb1 0 .476 0 .15
Y2 0 .238 .5 .85
Yb2 0 .238 .5 .15
Nb1 0 0 0
Nb2 0 .714 .5
O1 -.185 .08 .25
O2 -.25 .83 .315
O3 -.185 .65 .75
O4 -.25 .90 .815
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