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Inne
On structural phase transitions in piperidinium halogenoantimonates(III) and bismuthates(III): X-ray, calorimetric, dilatometric, dielectric and Raman studies.
Autorzy
Rok wydania
2000
Czasopismo
Journal of Physics and Chemistry of Solids
Numer woluminu
61
Strony
1249-1261
DOI
10.1016/S0022-3697(99)00414-X
Kolekcja
Język
Angielski
Typ publikacji
Artykuł
Three piperidinium analogues: (C5H10NH2)2BiCl5, (C5H10NH2)2BiBr5 and (C5H10NH2)2SbBr5 have been studied by means of differential scanning calorimetry, thermal expansion, dielectric and Raman scattering techniques. Each piperidinium salt undergoes one high-temperature structural phase transition, which has been classified as an “order–disorder” type. All transitions are connected with onset of reorientational motion of the organic cations. The X-ray studies on (C5H10NH2)2BiCl5 show that it crystallises in orthorhombic Pna21 space group. The structure has been refined to R=0.0336. It consists of one-dimensional (BiCl52−)n polyanionic chains and two non-equivalent piperidinium cations, one ordered and one disordered. The disorder is realised by splitting all atoms between two positions with half occupancy. The Raman studies of the polycrystalline (C5H10NH2)2BiCl5 performed in the frequency region between 3500 and 50 cm−1 show that the vibrational state of the piperidinium cation changes around the phase transition point.
Słowa kluczowe
Antimonates(III), Bismuthates(III), Raman, D. Dielectric properties, D. Phase transitions
Adres publiczny
https://doi.org/10.1016/S0022-3697(99)00414-X
Strona internetowa wydawcy
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