Perovskite's unit cell structure is cubic with titanium atoms at the corners, oxygen atoms at the midpoints of the edges with a calcium atom in the center. Its ABX3 cubic crystal structure corresponds to A (Calcium) which is a large, positively charged cation at the centre; B (Titanium), also cations, at the corners with smaller atom X (Oxygen), a negatively charge anion occupying the faces of the cube.
We list some of the various perovskite like crystal structures below. If you wanted to build different versions of the model or unit cell for comparison purposes, you can substitute the yellow & red atoms with blue octahedral or green octahedral versions.
The 12-coordinate atom is unique to the Orbit system. It can show the large A-site cations (e.g., Ca²) in cubic perovskites where they occupy a 12-fold coordinated site between corner-sharing BX3 octahedra.
Indigo Instruments has maintained a substantial inventory of genuine Cochranes of Oxford (Orbit) parts for 30+ years (scroll down to see "Skeletal (Orbit/Minit) and are compatible with every molecular model kit we have sold since day 1. This level of quality may appear expensive but no parts support from other vendors costs even more.
Perovskite | A (cation, 12-coord.) | B (cation, 6-coord.) | X (anion, 6-coord.) |
---|---|---|---|
Calcium titanate (CaTiO3) | Ca2+ | Ti4+ | O2− |
Barium titanate (BaTiO3) | Ba2+ | Ti4+ | O2− |
Strontium titanate (SrTiO3) | Sr2+ | Ti4+ | O2− |
Lead titanate (PbTiO3) | Pb2+ | Ti4+ | O2− |
Barium zirconate (BaZrO3) | Ba2+ | Zr4+ | O2− |
Barium stannate (BaSnO3) | Ba2+ | Sn4+ | O2− |
Cesium lead iodide (CsPbI3) | Cs+ | Pb2+ | I− |
Methylammonium lead iodide (MAPbI3) | CH3NH3+ (organic) | Pb2+ | I− |
Formamidinium lead iodide (FAPbI3) | HC(NH2)2+ (organic) | Pb2+ | I− |
Lanthanum manganite (LaMnO3) | La3+ | Mn3+ | O2− |
Yttrium iron oxide (YFeO3) | Y3+ | Fe3+ | O2− |
Gadolinium ferrite (GdFeO3) | Gd3+ | Fe3+ | O2− |
Potassium niobate (KNbO3) | K+ | Nb5+ | O2− |
P/N | Description | QTY |
---|---|---|
68186-30 | Wobbly bond, 30mm, each | 108 |
68186-50 | Wobbly bond, 50mm, each | 32 |
68254C | Atom, Orbit, O "l", octahedral, red | 54 |
68255C | Atom, Orbit, S "l", octahedral, yellow | 27 |
68265C | Atom, Orbit "q", metal, 12 coordinate, grey | 8 |
There are no printed instructions for assembling either the entire perovskite model or the unit cell. The specifications listed below should be enough to build the unit cell and note that the parts list is for the entire model.