Temperature- versus compositional-induced structural deformations of gadolinite group minerals with various Be/B ratio

Людмила Александровна Горелова, Тарас Леонидович Паникоровский, Л.А. Паутов, Олег Сергеевич Верещагин, Мария Георгиевна Кржижановская, Д. В. Спиридонова

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Abstract

Gadolinite 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 ºC) and high (from +25 to +1100 ºC) 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.
Original languageEnglish
Article number122187
Number of pages12
JournalJournal of Solid State Chemistry
DOIs
StateE-pub ahead of print - 20 Apr 2021

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