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Current issue   Ukr. J. Phys. 2016, Vol. 61, N 11, p.1017-1025
http://dx.doi.org/10.15407/ujpe61.11.1017    Paper

Moklyak V.V.1, Kotsyubynsky V.O.2, Yaremiy I.P.2, Kolkovskyy P.I.3,2, Hrubyak A.B.2, Zbihley L.Z.1

1 G.V. Kurdyumov Institute for Metal Physics, Nat. Acad. of Sci. of Ukraine
(36, Vernadskyi Ave., Kyiv 03142, Ukraine; e-mail: mvvmcv@mail.ru)
2 Vasyl Stefanyk Precarpathian National University
(57, Shevchenko Str., Ivano-Frankivsk 76025, Ukraine)
3 Joint Scientific and Research Laboratory of the Physics of Magnetic Films,
G.V. Kurdyumov Institute for Metal Physics, Nat. Acad. of Sci. of Ukraine
(57, Shevchenko Str., Ivano-Frankivsk 76025, Ukraine)

Morphological Characteristics of Hydrothermally Synthesized Iron Trifluorides with Various Hydration Degrees

Section: Nanosystems
Original Author's Text: Ukrainian

Abstract: The crystalline and magnetic microstructures and the morphological features of β-FeF3 3H2O, HTB-FeF30.33H2O, and r-FeF3 iron fluorides hydrothermally synthesized and annealed in the argon atmosphere have been studied. The dehydration process of plate-like β-FeF30.33H2O particles is studied in detail, and the model for corresponding structural modifications is proposed. The developed model is used to synthesize ultradispersed HTB-FeF30.33H2O and r-FeF3 materials. The r-FeF3 phase is found to be partially in the superparamagnetic state, with the particle size being comparable with the average size of coherent scattering regions.

Key words: iron trifluoride, dehydration, morphological properties, M¨ossbauer spectroscopy, thermogravimetric analysis, superparamagnetic state.