Synthesis, Characterization, and Polymorphism of [H3O][NbF6]: A Polar and Possibly Ferroelectric Oxonium Salt

Martin Möbs, Malte Sachs, Konstantin Rolheiser, Clemens Pietzonka, Antti J. Karttunen, Florian Kraus*

*Tämän työn vastaava kirjoittaja

Tutkimustuotos: LehtiartikkeliArticleScientificvertaisarvioitu

38 Lataukset (Pure)

Abstrakti

[H3O][NbF6] was obtained from the controlled hydrolysis of NbF5 in anhydrous liquid HF. It adopts a polar, orthorhombic crystal structure with space group Iba2 (no. 45, oI88) at room temperature. A first-order phase transition at 137 K leads to a cubic non-centrosymmetric polymorph in space group I213 (no. 199, cI88). This low-temperature modification results from a distinct rotation of the [H3O]+ cations canceling their polar orientation in the room temperature phase. Quantum-chemical calculations estimate a rotational barrier between 5.8 to 6.4 kJ/mol. At a temperature of 363 K, the compound adopts a centrosymmetric, cubic crystal structure in space group Pm (Formula presented.) m (no. 221, cP11) that shows rotational disorder of cations and anions. The transition from the polar phase at room temperature to the centrosymmetric phase at high temperature not only reveals the plastic nature of the high-temperature structure but also hints at potential ferroelectric properties, underscoring the multifaceted behavior of [H3O][NbF6] across different temperature regimes.

AlkuperäiskieliEnglanti
Artikkelie202400015
Sivumäärä15
JulkaisuEuropean Journal of Inorganic Chemistry
Vuosikerta27
Numero15
Varhainen verkossa julkaisun päivämäärä10 huhtik. 2024
DOI - pysyväislinkit
TilaJulkaistu - 22 toukok. 2024
OKM-julkaisutyyppiA1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä

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