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Towards ferroelectricity-inducing chains of halogenoantimonates(III) and halogenobismuthates(III).
Autorzy
Rok wydania
2021
Czasopismo
Numer woluminu
11
Strony
17574-17586
DOI
10.1039/d0ra10151f
Kolekcja
Język
Angielski
Typ publikacji
Artykuł
In halogenoantimonate(III) and halogenobismuthate(III) organic–inorganic hybrids, chains of trans-connected octahedra, trans-[MX5]∞, are considered attractive anionic structures for inducing ferroelectricity. The latter is realized by displacing the bridging halogen atoms along the chain direction – the process that changes the polarity of the whole unit. Advances in the identification of such materials have been hindered, however, by substantial difficulty in obtaining such structures. Here we investigate structural and dielectric properties of three families of compounds based on 2-mercaptopyrimidinium, 2-aminopyrimidinium, and 2-amino-4-methylpyrimidinium cations in which 8 out of 12 compounds show trans-[MX5]∞ chains in their crystal structures. Two of the compounds adopt a polar P21 space group and are potentially ferroelectric. We perform a detailed structural analysis of all compounds with trans-[MX5]∞ chains discovered by far to understand the factors that lead to the chains' formation. We reveal that the size of a cation predominantly defines the accessibility of structures with this anionic form and we provide rules for designing hybrids with trans-[MX5]∞ chains to help guide future efforts to engineer materials with interesting non-linear electrical properties.
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Pełny tekst licencji: https://creativecommons.org/licenses/by/3.0/pl/legalcode
Adres publiczny
http://dx.doi.org/10.1039/d0ra10151f
Strona internetowa wydawcy
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