FAPbI₃ typically exists in two polymorphs:
CIF (Crystallographic Information Framework) file is the digital DNA of one of the most exciting materials in modern science: Formamidinium Lead Iodide
octahedra. Subtle changes in these angles—often induced by temperature or pressure—drastically affect the material's electronic properties. Where to Find FAPbI₃ CIF Files
The interpretation of the FAPbI$_3$ CIF is non-trivial due to the "orbits" of the FA cation.
_space_group_name_H-M_alt 'P m -3 m' _space_group_IT_number 221 Use code with caution. 3. Atomic Coordinates The fractional positions ( fapbi3 cif file
| Software | Conversion Tool | Command / Workflow | | :--- | :--- | :--- | | | cif2vasp (part of VASPKIT) | cif2vasp -f fapbi3.cif -o POSCAR | | Quantum ESPRESSO | cif2qe or cif2cell | cif2cell fapbi3.cif -p espresso -o fapbi3.pwi | | LAMMPS | lammps-tools or moltemplate | Must convert CIF to data file; assign force fields (e.g., ReaxFF for Pb-I). | | Gaussian/ORCA (QM clusters) | Not recommended – periodic CIF does not translate to molecular clusters. Build manually from CIF coordinates. |
In the realm of chemistry and materials science, the Crystallographic Information File (CIF) format has emerged as a standard for representing and exchanging crystallographic data. Among the various CIF files used in these fields, the FAPBI3 CIF file holds significant importance. This article aims to provide a detailed understanding of FAPBI3 CIF files, their structure, and their applications.
When opened in visualization software like or Mercury , the coordinates in a CIF file generate an accurate 3D model of the atomic structure. The Two Critical Phases of FAPbI
is notoriously polymorphic, transitioning between several states based on temperature and environment: Common Name Crystal System Space Group Significance -phase Black phase | | Gaussian/ORCA (QM clusters) | Not recommended
The server's display read: New file detected: FAPbI₃_reboot.cif
One of the defining characteristics of formamidinium lead iodide is its polymorphism. The "fapbi3 cif file" you download or generate will generally depict one of two primary phases, depending on the temperature and the intended application: -Phase (Cubic/Trigonal, Black Phase)
Experimentalists use CIF files to generate . When a lab synthesizes a new batch of FAPbI₃, they compare their experimental peaks against the pattern derived from the CIF file to confirm they have successfully created the C. Structural Engineering
Experimentalists use the CIF file to generate a theoretical X-ray diffraction pattern. By comparing an experimental film's XRD data with the pattern simulated from the the chemistry involved
-phase , prized for its narrow optical bandgap of approximately which is ideally aligned to the AM1.5G solar spectrum. FAPbI3.cif - WMD-group/hybrid-perovskites - GitHub
data_FAPbI3_Cubic _audit_creation_method 'Rietveld Refinement' _chemical_name_common 'Formamidinium Lead Iodide' _cell_length_a 6.359 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 90 _symmetry_space_group_name_H-M 'P m -3 m' _symmetry_Int_Tables_number 221
This article breaks down the likely intended material behind this search, the chemistry involved, and how to find the correct structural data.
The stability of the perovskite structure is governed by the Goldschmidt Tolerance Factor ($t$): $$ t = \fracr_A + r_X\sqrt2(r_B + r_X) $$ For FAPbI$_3$: