Details

Autor(en) / Beteiligte

• Mel'nikova, Svetlana V.
• Laptash, Natalia M.
• Pogoreltsev, Evgeniy I.

Titel

Phase transformation in some hexahydrated metal(II) fluorogermanates and fluorotitanates: Optical and differential scanning calorimetry studies

Ist Teil von

• Journal of fluorine chemistry, 2022-11, Vol.263, p.110048, Article 110048

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2022

Link zum Volltext

Quelle

Elsevier ScienceDirect Journals Complete

Beschreibungen/Notizen

• •Single crystals of hydrated fluorides CoGeF6∙6H2O, FeGeF6∙6H2O, CoTiF6∙6H2O, ZnTiF6∙6H2O were grown.•Twinning, birefringence and heat capacities indicate a phase transition of the first order from trigonal to monoclinic symmetry.•Small values of the change in entropy and birefringence accompany the phase transition of CoGeF6∙6H2O and FeGeF6∙6H2O, and rather large values are typical for CoTiF6∙6H2O and ZnTiF6∙6H2O. [Display omitted] Graphical abstract_Synopsis!!! Polarization-optical observations of (001) section of an ABF6∙6H20 crystals: a − optically isotropic rhombohedra phase (T > T0). Twin pattern in the studied crystals at Т < Т0: b − CoGeF6∙6H2O; c − FeGeF6∙6H2O; d − FeTiF6∙6H2O; e − CoTiF6∙6H2O; f − ZnTiF6∙6H2O.