Fapbi3 Cif File Site
CIF file for the black phase will contain the following data structure:
The term is a database error. You are almost certainly looking for FAPbI$_3$ (Formamidinium Lead Iodide) .
This is the "black phase" desired for solar cells. It features a high-symmetry corner-sharing PbI6cap P b cap I sub 6 octahedral network with the FA⁺ cation in the center.
How atoms are distributed and vibrate within the lattice.
A is the universal standard for storing and exchanging crystal structure data. Think of it as a detailed architectural blueprint for a crystal at the atomic level. It describes the spatial arrangement of atoms, the symmetry, and the unit cell dimensions of a specific phase. fapbi3 cif file
Density Functional Theory (DFT) codes like , Quantum ESPRESSO , or CASTEP require structural inputs. Researchers use tools like ASE (Atomic Simulation Environment) or Pymatgen to convert the CIF file into POSCAR or input geometry format to calculate band structures, DOS (Density of States), and defect physics. 3. X-ray Diffraction (XRD) Analysis
The complexity of the FAPbI₃ CIF file lies in its . Depending on temperature and synthesis conditions, the material can exist in several phases:
While chemically intuitive, this model assumes the FA cation is spherical and statically centered. In reality, FA is a planar molecule. Fitting diffraction data to $Pm\bar3m$ often results in anomalously high thermal parameters ($B_iso$ or $U_iso$) for the nitrogen and carbon atoms, indicating static disorder rather than true vibration.
-phase (Yellow phase) : A non-perovskite hexagonal structure. This phase is thermodynamically stable at room temperature but optically inactive for photovoltaics. CIF file for the black phase will contain
In the ideal perovskite structure:
loop_ _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z _atom_site_occupancy _atom_site_U_iso_or_equiv Pb1 0.00000 0.00000 0.00000 1.0 0.023 I1 0.50000 0.00000 0.00000 1.0 0.035 N1 0.50000 0.50000 0.50000 0.5 0.080 ! Disordered C1 0.50000 0.50000 0.50000 0.5 0.090 ! Disordered
CIF file contains the exact spatial coordinates, lattice parameters, and symmetry operations that define the material's atomic structure.
exists in different structural phases depending on temperature. When downloading a CIF file, you must select the phase that matches your experimental conditions: Alpha Phase ( FAPbI3FAPbI sub 3 It features a high-symmetry corner-sharing PbI6cap P b
An excellent source for clean, DFT-relaxed structures of both the FAPbI3FAPbI sub 3
: CIF files are essential in materials science, chemistry, and physics for tasks such as:
Search for the structure ID. 5. Tips for Working with FAPbI3 CIF Files Handle Disorder: The formamidinium (
This "feature" is formatted as a standard Crystallographic Information File (CIF) that you can copy into software like VESTA, CrystalMaker, or PyMaw. CIF File Content: FAPbI3FAPbI sub 3 (Cubic Phase)
