Columbite-(Mg)
Pagola S, Carbonio R E, Alonso J A, Fernandez-Diaz M T
Journal of Solid State Chemistry 134 (1997) 76-84
Crystal structure refinement of Mg Nb2 O6 columbite from neutron powder
diffraction data and study of the ternary system MgO-Nb2O5-NbO, with evidence
of formation of new reduced pseudobrookite Mg5-xNb4+xO15-d (1.14<x<1.60) phases
Locality: synthetic
Note: reported and calculated Biso(O2)'s do not match
_database_code_amcsd 0013945
14.1875 5.7001 5.0331 90 90 90 Pbcn
atom      x     y     z Biso B(1,1) B(2,2) B(3,3) B(1,2) B(1,3) B(2,3)
Mg        0 .1688   .25  .40 .00038  .0049  .0033      0 -.0001      0
Nb   .15993 .3181 .7538  .24 .00028  .0014  .0028  .0001  .0005  .0011
O1    .0955 .3944 .4321  .37 .00067  .0025  .0033 -.0001 -.0004  .0011
O2    .0796 .1163 .9077  .25 .00048  .0063  .0032 -.0006  .0001  .0001
O3    .2560 .1222 .5833  .33 .00051  .0013  .0029  .0006  .0006 -.0002