Draft:Dion-Jacobson phase
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Dion-Jacobson phases are a type of perovskite structure represented by the general formula MIA(n-1)B(n)O(3n+1). The structure of this phase is considered a layered perovskite, meaning the structure consists of two-dimensional ABO3 perovskite-like layers, where ‘A’ and ‘B’ are cations, ‘M’ is a monovalent cation, and “n” represents the thickness of each perovskite-like layer, specifically the number of BO6 octahedra that corner-share in a stacking pattern. These perovskite-like layers of “n” thickness are separated by the monovalent cations. Ideally the ‘A’ cation has a 12-fold coordination, the ‘B’ cation has a 6-fold coordination, and the “M” cation has 8-fold coordination.[1]
The first recognized Dion-Jacobson phases were reported by M. Dion in September 1981, in which Dion prepared and characterized a series of MICa2Nb3O10 (MI = Li, Na, K, Rb, Cs, NH4, Tl) compounds.[2]
Crystal Structure
[edit]The general formula for the Dion-Jacobson phase is MIA(n-1)B(n)O(3n+1), where ‘M’ is a monovalent cation, ‘A’ and ‘B’ are cations, and oxygen represents the anions. The structure consists of corner-sharing BO6 octahedra layers, that extend infinitely along two axes. Along the third axis, the BO6 octahedra corner-share to a finite thickness, hence the variable “n”. The ‘A’ cation is located the at the body-centered position of the eight BO6 octahedra that form a cube. Depending on the identity of the monovalent cation, the perovskite-like layers could be displaced by 1/2 of the unit cell parameter, or not displaced at all.[1]
Synthesis
[edit]Inorganic Dion-Jacobson perovskites, such as KLaNb2O7, have been synthesized via high temperature solid state reactions between the respective carbonate and oxide precursors.[3] Two-dimensional Dion-Jacobson halide perovskites, such as (3AMPY)(MA)Pb2I7 (3AMPY = 3-(aminomethyl)pyridinium and MA= methylammonium) have been synthesized via precipitation reactions as well.[4]
References
[edit]- ^ a b Cava, Robert. "Perovskite Structure and Derivatives". Cava Lab Solid State Chemistry Research Group. Retrieved 25 April 2025.
- ^ Dion, M. (1981). "Nouvelles Familles de Phases MIM2IINb3O10 a Feuillets "Perovskites."". Mater. Res. Bull. 16 (11): 1429–1435. doi:10.1016/0025-5408(81)90063-5.
- ^ Sato, M.; Abo, J.; Jin, T.; Ohta, M. (1993). "Structure and Ionic Conductivity of MLaNb2O7 (M = K, Na, Li, H)". J. Alloys Compd. 192 (1–2): 81–83. doi:10.1016/0925-8388(93)90192-p.
- ^ Li, X.; Ke, W.; Traoré, B.; Guo, P.; Hadar, I. (2019). "Two-Dimensional Dion–Jacobson Hybrid Lead Iodide Perovskites with Aromatic Diammonium Cations" (PDF). Journal of the American Chemical Society. 141 (32): 12880–12890. Bibcode:2019JAChS.14112880L. doi:10.1021/jacs.9b06398. PMID 31313919.