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Inne
Structure, phase transitions and molecular motions in ferroelastic (C4H8NH2)SbCl6·(C4H8NH2)Cl.
Autorzy
Rok wydania
2002
Czasopismo
Journal of Physics-Condensed Matter
Numer woluminu
14
Strony
3129-3142
DOI
10.1088/0953-8984/14/12/305
Kolekcja
Język
Angielski
Typ publikacji
Artykuł
The crystal structure at 293 K of the new pyrrolidinium chloroantimonate (V) analogue, (C4H8NH2)SbCl6·(C4H8NH2)Cl, has been determined by x-ray diffraction as monoclinic, space group P21/c, Z = 8. The crystal is built up of isolated SbCl6- anions, two types of inequivalent pyrrolidinium cation and isolated Cl- ions. It undergoes five solid-solid phase transitions: at 351/374 K of first-order type (cooling/heating, respectively), at 356 and 152 K second order and at 135/141 and 105/134 K first order, detected by differential scanning calorimetry, dilatometric and dielectric measurements. The ferroelastic domain structure appears between 152 and 135 K. The proton nuclear magnetic resonance second moment and spin-lattice relaxation time of polycrystalline samples were studied over the temperature range 27-410 K. The order-disorder mechanism of the phase transitions at 105 and 374 K connected with the reorientational motion of the pyrrolidinium cations has been confirmed.
Adres publiczny
https://doi.org/10.1088/0953-8984/14/12/305
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