Istituto di Geoscienze e Georisorse     
Chelazzi L., Ballaran T., Bindi L., Bonazi P. In situ high-temperature X-ray powder diffraction study of the synthetic Ca2Sb2O7 weberite-type compound. In: Periodico di Mineralogia, vol. 80 (1) pp. 145 - 153. Dipartimento di Scienze della Terra, UniversitÓ degli Studi di Roma "La Sapienza", 2011.
The crystal structure of synthetic Ca2Sb2O7 has been investigated by in situ X-ray powder diffraction methods within the temperature range 298-1273 K. Ca2Sb2O7 is orthorhombic, space group Imma, over the entire temperature range and shows only general thermal expansion. The unit-cell parameters show a monotonous increase as a function of temperature. Only slight changes occur in the individual bond distances without evidence of abrupt structural changes. The mean coefficients of thermal expansion along the various axes are: ╬▒a = 9.49 x 10-6 K-1, ╬▒b = 10.11 x 10-6 K-1, ╬▒c = 7.56 x 10-6 K-1 and the bulk thermal expansion coefficient ╬▒V = 27.20 x 10-6 K-1.
URL: http://periodicodimineralogia.it/index.php/mineralogia/index
Subject weberite
X-ray podwer diffraction
Rietveld refinements

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