0000000000661562
AUTHOR
J. Przesławski
Structure, ferroelasticity and Goldilocks zone phase transitions in C3H5N2Al(SO4)2·6H2O
The single crystal growth and sequence of reversible phase transition are described for C3H5N2Al(SO4)2·6H2O. Thermal and structural analyses combined with dielectric studies and optical observations revealed the structural phase transition at T 1 = 339/340 K (I↔II) and T 2 = 347/348 K (II↔III) on heating and cooling, respectively. Both phase transitions are of the first-order type. The symmetry changes from monoclinic to trigonal phase. At 293 K, the large crystals are usually divided into numerous domains of the ferroelastic type that disappear above T 1 on heating and reappear below T 1 on cooling. The domain structure pattern is characteristic for the transition between trigonal and mono…
Structural phase transition in [(C2H5)4N][(CH3)4N]ZnCl4
The hybrid crystal [(C2H5)4N][(CH3)4N]ZnCl4 was studied using several experimental methods. DSC studies revealed the first order phase transition to the high temperature phase at about 496 K. This phase transition was confirmed in dielectric studies. Optical observation revealed the domain structure appearance characteristic for that of the phase transition between tetragonal and orthorhombic phases. This phase transition shows a lowering of symmetry as in the case of bromide analogs. Additionally, the optical studies showed the appearance of a number of cracks in the sample and in some cases, the samples became milky after cooling from the high temperature to the room temperature phase.
CCDC 2047335: Experimental Crystal Structure Determination
Related Article: B. Zarychta, Z. Czapla, J. Przesławski, P. Szklarz|2021|Acta Crystallogr.,Sect.B:Struct.Sci.,Cryst.Eng. and Mat.|77|225|doi:10.1107/S2052520621001256
CCDC 2047334: Experimental Crystal Structure Determination
Related Article: B. Zarychta, Z. Czapla, J. Przesławski, P. Szklarz|2021|Acta Crystallogr.,Sect.B:Struct.Sci.,Cryst.Eng. and Mat.|77|225|doi:10.1107/S2052520621001256
CCDC 2047336: Experimental Crystal Structure Determination
Related Article: B. Zarychta, Z. Czapla, J. Przesławski, P. Szklarz|2021|Acta Crystallogr.,Sect.B:Struct.Sci.,Cryst.Eng. and Mat.|77|225|doi:10.1107/S2052520621001256