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

One-dimensional B2O3 models (not DFT-optimized) as predicted by GRINSP

Construction of these B2O3 models (3D, 2D, 1D and 0D) described in 2005 and 2010 in refs. [1 and 8] - BO3 triangles interconnected exclusively by corner-sharing. See other works in a 2012 paper and in a 2016 thesis. Data from the 2009 (766 models) and 2010 (5118 models) PCOD updates.

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

References for these GRINSP predictions :

1- Inorganic structure prediction with GRINSP. A. Le Bail, J. Appl. Cryst. 38 (2005) 389-395.
2- Predicted corner-sharing titanium silicates. A. Le Bail, Z. Kristallogr., Suppl. 26 (2007) 203-208.
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, Algérie (2005).
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...

Tunnels and multiple tunnels with variable diameters, more or less open,  or ribbons more or less straight, helicoïdal, etc

PCOD1501832   CIF

inter-crossed in a cubic structure :

PCOD2233614   CIF

PCOD2020239   CIF

PCOD1501055   CIF

PCOD1501073   CIF

PCOD1500159   CIF

PCOD1500407   CIF

PCOD1501401   CIF

PCOD1500161   CIF

PCOD1500164   CIF

PCOD1500421   CIF

PCOD1500165   CIF

PCOD1501657   CIF

PCOD1501591   CIF

PCOD1500259   CIF

PCOD1500300   CIF

PCOD1501484   CIF

PCOD1501655   CIF

PCOD1501656   CIF

PCOD1502208   CIF

PCOD1502207   CIF

PCOD1502184   CIF

PCOD1501280   CIF

PCOD1501456   CIF

PCOD1501648   CIF

PCOD1502063   CIF

PCOD1502060   CIF

PCOD1501317   CIF

PCOD1501328   CIF

PCOD1501583   CIF

PCOD1501357   CIF

PCOD1501647   CIF

PCOD1500427   CIF

PCOD1501378   CIF

PCOD1500457   CIF

PCOD1501001   CIF

PCOD1501111   CIF

PCOD1500751   CIF

PCOD1500509   CIF

PCOD1500619   CIF

PCOD1502272   CIF

PCOD1501661   CIF

PCOD1501660   CIF

PCOD1501653   CIF

PCOD1500424   CIF

PCOD1501193   CIF

PCOD1501965   CIF

PCOD1501949   CIF

PCOD1501729   CIF

PCOD1502236   CIF

PCOD1502209   CIF

PCOD1502173   CIF

PCOD1502159   CIF

PCOD1502155   CIF

PCOD1502154   CIF

PCOD1502140   CIF

PCOD1502094   CIF

PCOD1501947   CIF

PCOD1502042   CIF

PCOD1502030   CIF

PCOD1502001   CIF

PCOD1502000    CIF

PCOD1501860   CIF

PCOD1501990   CIF

PCOD1501945   CIF

PCOD1501939   CIF

PCOD1501937   CIF

PCOD1501865   CIF

PCOD1501706   CIF

PCOD1501688   CIF

PCOD1501051   CIF

PCOD1501053   CIF

PCOD1501054   CIF

PCOD1501076   CIF

PCOD1501105   CIF

PCOD1501106   CIF

PCOD1501158   CIF

PCOD1501195   CIF

PCOD1501199   CIF

PCOD1501207   CIF

PCOD1501215   CIF

PCOD1501225   CIF

PCOD1501244   CIF

PCOD1501256   CIF

PCOD1501270   CIF

PCOD1501274   CIF

PCOD1501574   CIF

PCOD1501643   CIF

PCOD1501646   CIF

PCOD1501060   CIF

PCOD1500684   CIF