Repozytorium
Wyszukaj
Kolekcje
Inne
Temperature symmetry breaking and properties of lead-free organic–inorganic hybrids: bismuth(III) iodide and antimony(III) iodide: (S(CH3)3)3[Bi2I9] and (S(CH3)3)3[Sb2I9]
Autorzy
Rok wydania
2023
Czasopismo
Numer woluminu
52
Strony
11981-11991
DOI
10.1039/d3dt01650a
Kolekcja
Język
Angielski
Typ publikacji
Artykuł
We have synthesized and characterized two novel lead-free organic–inorganic hybrid crystals: (S(CH3)3)3[Bi2I9] (TBI) and (S(CH3)3)3[Sb2I9] (TSI). Thermal DSC, TG, and DTA analyses indicate structural phase transitions (PTs) in both compounds; TBI undergoes two structural phase transitions at 314.2/314.8 K (cooling/heating) and at 181.5 K of first (I ↔ II) and second order (II ↔ III), respectively. The crystal structures of TBI are refined for phases I (325 K), II (200 K) and III (100 K). TBI exhibits ferroelastic properties since both PTs are accompanied by a change in the symmetry of crystals: P63/mmc → C2/c (I → II) and C2/c → P (II → III). The presence of a ferroelastic domain structure has been confirmed by optical observations. In turn, TSI also reveals two PTs: I ↔ II (at 303.9/304.1 K) and II ↔ III (212.9/221.4 K). To compare and obtain insight into the mechanism of the PTs of TBI, we have carried out temperature dependent single crystal X-ray diffraction studies. Additionally, to confirm the change in the dynamical states of molecules in PTs, dielectric measurements have been carried out between 100 K and 400 K in the frequency range of 200 Hz to 2 MHz. Moreover, the measurements of the 1H NMR spin–lattice relaxation time, T1, and a second moment, M2, of the 1H NMR line have been undertaken in the temperature range between 100 and 300 K.
Adres publiczny
http://dx.doi.org/10.1039/d3dt01650a
Strona internetowa wydawcy
Podobne publikacje
Structural, Electric and Dynamic Properties of (Pyrrolidinium)3[Bi2I9] and (Pyrrolidinium)3[Sb2I9]: New Lead-Free, Organic–Inorganic Hybrids with Narrow Band Gaps
Rowińska Magdalena, Piecha-Bisiorek Anna, Medycki Wojciech, Durlak Piotr, Jakubas Ryszard, Gągor Anna
Vibrational spectra of [(CH3) 3NH] 3Sb2Cl9, [(CH3) 3NH] 3Bi2Cl9 and their mixed crystals.
Bator Grażyna , Zeegers-Huyskens Th.
Structure and phase transitions in [(CH3)4P]3[Sb2Br9] and [(CH3)4P]3[Bi2Br9].
Wojtaś Maciej, Jakubas Ryszard, Ciunik Zbigniew, Medycki Wojciech