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Kolekcje
Inne
Structural phase transition and ferroelasticity in (H2NNH3)3CdBr5 crystal.
Autorzy
Rok wydania
2019
Czasopismo
Journal of Physics and Chemistry of Solids
Numer woluminu
124
Strony
94-99
DOI
10.1016/j.jpcs.2018.09.005
Kolekcja
Język
Angielski
Typ publikacji
Artykuł
Single crystals of (H2NNH3)3CdBr5 were grown and their properties were investigated. DSC, DTG, structural studies, optical polarized microscopy observations and dielectric studies are presented. TGA showed the stability of the substance up to about 455 K and decomposition above this temperature. DSC studies revealed the first order structural phase transitions at 294/292 on heating/cooling runs. X-ray structural studies showed a change of symmetry from orthorhombic to monoclinic and the transition seems to belong to the mmmF2/m Aizu's species. In optical studies performed with a polarizing microscope, the ferroelastic type of domain structure and the phase front appearance were observed. Dielectric measurements clearly evidenced the first-order phase transition as a jump-like decrease of permittivity on cooling and increase on heating. Structural and dielectric studies indicate the order-disorder character of the phase transition.
Słowa kluczowe
Organic – inorganic compounds, Structural studies, Phase transitions, DSC, DTA, DTG measurements, Dielectric properties, Optical observations
Adres publiczny
http://dx.doi.org/10.1016/j.jpcs.2018.09.005
Strona internetowa wydawcy
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