Temperature-versus compositional-induced structural deformations of gadolinite group minerals with various Be/B ratio
2021; Elsevier BV; Volume: 299; Linguagem: Inglês
10.1016/j.jssc.2021.122187
ISSN1095-726X
AutoresLiudmila A. Gorelova, Taras L. Panikorovskii, Leonid A. Pautov, Oleg S. Vereshchagin, Maria G. Krzhizhanovskaya, Dar’ya V. Spiridonova,
Tópico(s)Crystal Structures and Properties
ResumoGadolinite crystals from Mogov (Tajikistan), Dorozhniy (Tajikistan), Dara-Pioz (Tajikistan) and Osterby (Sweden) with different Be/B ratio (0.56–191) were studied by single crystal X-ray diffraction, energy dispersive and wavelength-dispersive X-ray analysis and inductively coupled plasma–optical emission spectrometry to compare their crystal chemistry features. Besides, Raman spectra and thermal behavior at low (from −173 to +67 °C) and high (from +25 to +1100 °C) temperatures of gadolinite-(Y) from Osterby (Sweden) was investigated in order to study recrystallization and obtain the thermal expansion coefficients. It was shown that thermal expansion of gadolinite-(Y) (Y2Fe2+Be2Si2O10) is very close to the expansion of datolite (Ca2B2Si2O8(OH)2). Comparison of the temperature and chemical deformations confirms the main rules of comparative crystal chemistry.
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