See what you will probably never see in reality, thanks to the PCOD

Three-dimensional borosilicate models (not DFT-optimized) as predicted by GRINSP

Models selected among 3603 CIFs including 3D, 2D and 1D borosilicates - BO3 triangles connected to SiO4  tetrahedra exclusively by corner-sharing - listed according to increasing framework density (FD)

Not exhaustive list (more will be added during the next weeks, maybe)...

References for these predictions :

1- Inorganic structure prediction with GRINSP. A. Le Bail, J. Appl. Cryst. 38 (2005) 389-395.   http://journals.iucr.org/j/issues/2005/02/00/cg5019/
2- Predicted corner-sharing titanium silicates. A. Le Bail, Z. Kristallogr., Suppl. 26 (2007) 203-208. https://www.researchgate.net/publication/228093494_Predicted_corner-sharing_titanium_silicates
3- Powerpoint file : Contribution to the "Gordon Conference Style" Workshop : Global Optimisation Techniques Applied to the Prediction of Structures, 5-7 July 2006, University College London (.ppt or zipped)
4- Advances in structure prediction of inorganic compounds. A. Le Bail, Report of 2nd Algerian Crystallography Congress, AlgĂ©rie (2005).  http://arxiv.org/abs/cond-mat/0606025
5- Hypothetical AlF3 crystal structures, A. Le Bail, F. Calvayrac, J. Solid State Chem., 179 (2006) 3159-3166.
6- Inorganic structure prediction: too much and not enough, A. Le Bail, Solid State Phenomena 130 (2007) 1-6.
7- Frontiers between crystal structure prediction and determination by powder diffractometry, A. Le Bail, Powder Diffraction, S23 (2008) S5-S12.
8- Databases of virtual inorganic crystal structures and their applications, A. Le Bail, Phys. Chem. Chem. Phys. 12 (2010) 8521-8530. DOI: 10.1039/c003907c
Etc - search by yourself after all...

PCOD7000551   SiB6O11   FD =10.26   CIF

PCOD7000988   Si2B2O7   FD = 10.65   CIF

PCOD7003248   Si2B6O13   FD = 10.84   CIF

PCOD7001805   Si2B6O13   FD = 10.89   CIF

PCOD7002756   Si2B2O7   FD = 11.54   CIF

PCOD7003132   Si4B18O35   FD = 11.58   CIF

PCOD7002453   SiB2O5  FD = 11.60   CIF

PCOD7002044   Si9B2O21   FD = 11.72   CIF

PCOD7002472   Si2B2O7   FD = 11.80   CIF

PCOD7000654   Si2B6O13   FD = 11.89   CIF

PCOD7000315   SiB6O11   FD = 12.04   CIF

PCOD7002182   Si3B8O18   FD = 12.07   CIF

PCOD7000020   SiB6O11   FD = 12.16   CIF

PCOD7001942   SiB10O17   FD = 12.17   CIF

PCOD7002728   SiB4O8   FD = 12.33   CIF

PCOD7002628   SiB10O17   FD = 12.50   CIF

PCOD7000321   SiB2O5   FD = 12.53   CIF

PCOD7003348   SiB8O14   FD = 12.53   CIF

PCOD7003256   Si4B6O17   FD = 12.61   CIF

PCOD7000685   Si2B6O13   FD = 12.61   CIF

PCOD7002725   SiB4O8   FD = 12.69   CIF

PCOD7002167   SiB2O5   FD = 21.69   CIF

PCOD7000318   SiB24O38   FD = 12.72   CIF


PCOD7003332   Si2B6O13   FD = 12.79   CIF

PCOD7000695   Si3B10O21   FD = 12.81   CIF

PCOD7002659   Si2B6O13   FD = 12.86   CIF

PCOD7001887   SiB2O5   FD = 12.88   CIF

PCOD7002010   SiB2O5   FD = 12.88   CIF

PCOD7002229   SiB6O11   FD  = 12.91   CIF

PCOD7001003   Si2B2O7   FD = 13.13   CIF