Repozytorium
Wyszukaj
Kolekcje
Inne
NMR and dilatomeric studies of the structural phase transitions of (CH3NH3)3Sb2I9 and (CH3NH3)3Bi2I9 crystal.
Autorzy
Rok wydania
1992
Czasopismo
Journal of Physics and Chemistry of Solids
Numer woluminu
53
Strony
755-759
DOI
10.1016/0022-3697(92)90185-G
Kolekcja
Język
Angielski
Typ publikacji
Artykuł
Linear thermal expansions of single crystals of (CH3NH3)3Sb2I9(MAIA) and (CH3NH3)3Bi2I9 (MAIB) were measured in the 100–295 K temperature range. Both crystals display a large anisotropy in the dilatation measured along the a- and c-axes in the vicinity of all phase transitions (PT). The pressure coefficients at the first-order phase transitions for MAIA (149 K) and MAIB (145 K) were +6.0 and +5.7 × 10−2 K MPa−1, respectively. The temperature dependence of the 1H spin-lattice relaxation time Tl2 was measured for solid MAIB. Discontinuities in the spin-lattice relaxation plot corroborate the first-order PT at 145 K and the second-order one at 218 K. Molecular motions occurring in the respective phases are identified and their activation energies evaluated.
Adres publiczny
https://doi.org/10.1016/0022-3697(92)90185-G
Strona internetowa wydawcy
Podobne publikacje
Properties and structural phase transitions of (CH3NH3)3Sb2I9.
Zaleski J., Jakubas Ryszard, Sobczyk Lucjan, Mróz J.
Infrared studies of structural phase transitions in (NH3CH3)3Sb2I9.
Bator Grażyna , Jakubas Ryszard, Baran Jan, Ratajczak Henryk
Infrared studies of structural phase transitions in (CH3NH3)3Bi2I9 (MAIB).
Bator Grażyna , Jakubas Ryszard, Baran Jan, Ratajczak Henryk