Repozytorium
Wyszukaj
Kolekcje
Inne
Flexible crystals of perovskite-like coordination polymers with a tunable and switchable organic guest: (CH3NH3)2[KFe(CN)6] and (CH3NH3)2[KCo(CN)6].
Autorzy
Rok wydania
2017
Czasopismo
Numer woluminu
46
Strony
2322-2331
DOI
10.1039/c6dt03915d
Kolekcja
Język
Angielski
Typ publikacji
Artykuł
Streszczenie
The crystal structure has been determined for (CH3NH3)2[KCo(CN)6] at temperatures 100 and 443 K. It crystallizes in the monoclinic space group C2/c (LT) and in the cubic one Fm¯3m (HT). The dielectric response has been investigated for the single crystals of pure K3[A’(CN)6]) and guest-hosts of (CH3NH3)2[KA’(CN)6], where A’ is trivalent metal, Co or Fe. Their dielectric properties were measured in the frequency range between 135 Hz and 2MHz in a wide temperature range between 200 and 460K. The anisotropy of the electric permittivity for the single crystals of (CH3NH3)2[KCo(CN)6] was analysed in terms of the crystal structure. The relaxation processes were observed in the case of pure host K3Fe(CN)6 and guest/host crystal (CH3NH3)2[KFe(CN)6]. The activation energies of the dielectric relaxation have been estimated to be equal to 44 and 40 kJ/mol for (CH3NH3)2[KFe(CN)6] and K3Fe(CN)6, respectively. The mechanism of the phase transitions found at 425 K and 421 K for (CH3NH3)2[KFe(CN)6] and (CH3NH3)2[KCo(CN)6], respectively, has been postulated. From the dielectric losses the value of the electric ac conductivity has been estimated and analyzed in terms of the activation process of the current carriers.
Licencja otwartego dostępu
Licencja na prawach której można swobodnie kopiować, rozprowadzać, zmieniać i remiksować objęty prawem autorskim utwór (Utwór-przedmiot prawa autorskiego) pod warunkiem podania imienia i nazwiska autora utworu pierwotnego oraz źródła pochodzenia utworu.
Pełny tekst licencji: https://creativecommons.org/licenses/by/3.0/pl/legalcode
Adres publiczny
http://dx.doi.org/10.1039/c6dt03915d
Strona internetowa wydawcy
Podobne publikacje
Structural phase transitions coupled with prominent dielectric anomalies and dielectric relaxation in [(CH3)3NH]2[KCo(CN)6] and mixed [(CH3)3NH]2[KFexCo1−x(CN)6] double perovskite hybrids.
Rok Magdalena, Zarychta Bartosz, Moskwa Marcin, Dziuk Błażej, Medycki Wojciech, Bator Grażyna
Multifunctional materials based on the double-perovskite organic–inorganic hybrid (CH3NH3)2[KCr(CN)6] showing switchable dielectric, magnetic, and semiconducting behaviour
Rok Magdalena, Moskwa Marcin, Działowa Marta, Bieńko Alina, Rajnák Cyril, Boča Roman, Bator Grażyna
Switchable dielectric constant, structural and vibrational studies of double perovskite organic–inorganic hybrids: (azetidinium)2[KCr(CN)6] and (azetidinium)2[KFe(CN)6].
Rok Magdalena, Moskwa Marcin, Hetmańczyk Joanna, Hetmańczyk Łukasz, Bator Grażyna